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Firing DropDownList.SelectedIndexChanged event when enableViewState = false

I have a DropDownList control which really don't want to enable ViewState for as the item list is readily available from the server.
In this situation a post-back will obviously show an empty Items list, but at the same time I want the SelectedIndexChanged event to fire (using AutoPostBack)
The DropDownList control is actually dynamically created as part of a Composite Control which created an arbitrary number of DDLs - some of whose Items are sourced from the ASPX file (composite control contents) and others whose Items are bound to a data source. I am hoping that this complication isn't the source of the problem.
My thinking is that I should bind the list data to the Items collection on initial PageLoad and also rebind it late on PostBacks but I am not sure when. I am also not sure if the SelectedIndexChanged event handler will get called if on PostBack there is an empty Items list again.
Because it is part of a CompositeControl, I wonder if I should store some additional information in Control State. Would implementing something in the Conposite Control's Save/LoadControlState, Save/LoadViewState, RaisePostDataChangedEvent or RaisePostbackEvent be the solution?
Maybe I should rebind the Item list again early on PostBack e.g.before PageLoad?
Any pointers will be appreciated.
Thanks
Code provided below (cut out most of what is not relevant to problem)
Page ASPX
Note that I want to populate the ListItems of the { Group, Location, Division and BusinessUnit } DropDownLists dynamically with the items not being in dumped to ViewState but { Enabled } DDL is the static items defined below.
<cc1:FilterBar ID="FilterBar1" runat="server" CssClass="filterbar" OnFilterChanged="OnFilterChanged">
<cc1:Filter ID="Group" Label="Group" Type="DropDownList" />
<cc1:Filter ID="Location" Label="[Location]" Type="DropDownList" />
<cc1:Filter ID="Division" Label="[Division]" Type="DropDownList" />
<cc1:Filter ID="BusinessUnit" Label="[Business Unit]" Type="DropDownList" />
<cc1:Filter ID="Enabled" Label="Users" Type="DropDownList">
<asp:ListItem Value="X" Text="All"></asp:ListItem>
<asp:ListItem Value="1" Text="Active Only"></asp:ListItem>
<asp:ListItem Value="0" Text="Archived Only"></asp:ListItem>
</cc1:Filter>
</cc1:FilterBar>
Page Code Behind
protected void Page_Load(object sender, EventArgs e)
{
//if (!Page.IsPostBack) // whether to restire BindFilterBar() to first load or not?
BindFilterBar();
}
protected void BindFilterBar()
{
var h = new FilterBarBindHelper(FilterBar1);
h.AutoBindLocation(Filter.UserLocation.ID);
h.AutoBindDivision(Filter.UserDivision.ID);
h.AutoBindBusinessUnit(Filter.UserBusinessUnit.ID);
h.AutoBindGroup(Filter.UserGroup.ID);
var filter = FilterBar1.GetFilterByID("Enabled");
filter.SelectedValue = Filter.UserEnabledAsChar.ToString();
}
protected void OnFilterChanged(object sender, FilterChangedEventArgs e)
{
Debug.WriteLine($"[CompletionResults.aspx] OnFilterChanged(e={{FilterID={e.FilterID}; NewValue={e.NewValue} NewText={e.NewText}}})");
switch(e.FilterID)
{
case "Enabled":
Filter.UserEnabledAsChar = e.NewValue;
break;
case "Group":
if (e.NewValueAsInt == null)
Filter.UserGroup.Reset();
else
Filter.UserGroup.Set((int)e.NewValueAsInt, e.NewText);
break;
case "Division":
if (e.NewValueAsInt == null)
Filter.UserDivision.Reset();
else
Filter.UserDivision.Set((int)e.NewValueAsInt, e.NewText);
break;
case "BusinessUnit":
if (e.NewValueAsInt == null)
Filter.UserBusinessUnit.Reset();
else
Filter.UserBusinessUnit.Set((int)e.NewValueAsInt, e.NewText);
break;
case "Location":
if (e.NewValueAsInt == null)
Filter.UserLocation.Reset();
else
Filter.UserLocation.Set((int)e.NewValueAsInt, e.NewText);
break;
default:
return;
}
// Update Selection Text
BindSelectionText();
// Update the Grid
BindGrid();
}
/// <summary>
/// User has selected a new Page number from the UserGrid
/// </summary>
protected void OnPageChanged(object sender, EventArgs args)
{
Filter.ShowAllRows = false;
Filter.PageIndex = UserGrid.PageIndex;
BindGrid();
}
protected void OnAction(object sender, ToolbarActionClickedEventArgs args)
{
if (args.ActionValue == "email")
OnEmail();
}
FilterBarBindHelper.cs
public class FilterBarBindHelper
{
private readonly FilterBar _filterBar;
private readonly OrganisationProperties _orgProps;
public FilterBarBindHelper(FilterBar filterBar)
{
if (filterBar == null)
throw new ArgumentNullException(nameof(filterBar));
_filterBar = filterBar;
_orgProps = ObjectCache.GetOrganisationProperties();
}
/// <summary>
/// Binds Group list data to Filter, optionally creating the Filter if it doesn't exist
/// </summary>
/// <param name="selectedID">ID of currently selected Group to filter by (0 or null if none)</param>
/// <param name="createFilter">Create the Filter if not found</param>
public void AutoBindGroup(int? selectedID, bool createFilter = true)
{
// All Organisations have Groups.
// Only populate if a FilterBar Filter with ID="Groups" can be found or if createFilter = true
var f = _filterBar.GetFilterByID("Group");
if (f == null)
if (createFilter)
f = CreateFilter("Group", "Group");
else
return;
// Populate Filter list with items
var src = GroupCache.Get();
f.Items.Clear();
f.Items.Add(Any());
f.Items.AddRange(src.Select(s => new ListItem() { Value = s.StringID, Text = s.Name }).ToArray());
// Assign localised name
f.Label = _orgProps.GroupNm;
// Select
if((selectedID ?? 0) != 0)
f.SelectedValue = selectedID.Value.ToString();
_filterBar.RefreshFilter(f);
}
/// <summary>
/// Create a FilterBar Filter and add it to the FilterBar
/// </summary>
/// <param name="filterID">ID of filter to add</param>
/// <param name="label">Filter's label</param>
/// <param name="type">Filter's type</param>
/// <returns>New Filter</returns>
private Filter CreateFilter(string filterID, string label, FilterType type = FilterType.DropDownList)
{
var f = new Filter() { ID = filterID, Type = type, Label = label };
_filterBar.Filters.Add(f);
return f;
}
private ListItem Any()
{
return new ListItem("Any", "X");
}
}
Toolbar.cs
[
AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal),
AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal),
DefaultProperty("Items"),
ParseChildren(true, "Items"),
ToolboxData("<{0}:Toolbar runat=server />"),
Designer(typeof(ToolbarDesigner))
]
public class Toolbar : CompositeControl
{
private string _preText = "Actions: ";
private bool _showRight = true;
private readonly List<ToolbarItem> _list = new List<ToolbarItem>();
public Toolbar()
{
PreText = "Actions: ";
ObjectNameSingle = "Item";
ObjectNamePlural = "Items";
ShowRight = true;
}
protected override HtmlTextWriterTag TagKey { get { return HtmlTextWriterTag.Div; } }
[
Category("Behavior"),
Description("The Item collection"),
DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
Editor(typeof(ToolbarCollectionEditor), typeof(UITypeEditor)),
PersistenceMode(PersistenceMode.InnerDefaultProperty)
]
public List<ToolbarItem> Items
{
get { return _list; }
}
//various properties (snip)
protected override void RenderContents(HtmlTextWriter writer)
{
if(_leftSide != null)
_leftSide.RenderControl(writer);
if(_rightSide != null)
_rightSide.RenderControl(writer);
if(_leftSide == null && _rightSide == null && DesignMode)
writer.Write("No Toolbar Items have been set up in designer");
}
public void RebuildChildControls()
{
// Indicate that the child controls need rebuilding
// Ref: http://yourdotnetdesignteam.blogspot.co.uk/2008/09/life-cycle-of-aspnet-controls_28.html "Composite Controls" section:
// "Note 1: When the Composite Control is displayed normally, 'CreateChildControls' is called AFTER the 'Load' method.
// However, when a post back event occurs, 'CreateChildControls' is called AFTER the 'Init' method.
// This certainly makes the 'CreateChildControls' method an "interesting" aspect of the Life Cycle."
// So on postback, the calling method should call RebuildChildControls() after repopulating/modifying Filter Items
ChildControlsCreated = false;
//RecreateChildControls(); this will happen in due course anyway
}
// Controls in Composite Control
private ToolbarActionContainer _leftSide;
private WebControl _rightSide;
private ToolbarActionItem _liPreText;
private Literal _litPreText;
private HtmlGenericControl _spanRowCount;
private HtmlGenericControl _spanPageCount;
private DropDownList _ddlPage;
private Literal _litPageCount;
protected override void CreateChildControls()
{
Controls.Clear();
_leftSide = new ToolbarActionContainer(); // UL
_rightSide = new WebControl(HtmlTextWriterTag.Div);
_liPreText = new ToolbarActionItem(ToolbarActionType.PreText);
_litPreText = new Literal() { Text = "Actions: " };
// Create the Toolbar Action Items
var actionItems = new List<ToolbarActionItem>(_list.Count);
foreach (var item in _list)
{
if (item.Visible)
{
var li = CreateToolbarActionItemControls(item);
actionItems.Add(li);
}
}
_spanRowCount = new HtmlGenericControl("span"); // "NNN entitie(s) found";
_spanPageCount = new HtmlGenericControl("span"); // "Page [DDL] of [LIT]";
_ddlPage = new DropDownList() { ID = "PageDDL", AutoPostBack = true, EnableViewState = false };
_litPageCount = new Literal();
_spanPageCount.Controls.Add(new Literal() { Text = "Page " });
_spanPageCount.Controls.Add(_ddlPage);
_spanPageCount.Controls.Add(new Literal() { Text = " of " });
_spanPageCount.Controls.Add(_litPageCount);
_liPreText.Controls.Add(_litPreText);
_leftSide.Controls.Add(_liPreText);
foreach(var item in actionItems)
_leftSide.Controls.Add(item);
_rightSide.Controls.Add(_spanRowCount);
_rightSide.Controls.Add(_spanPageCount);
Controls.Add(_leftSide);
Controls.Add(_rightSide);
_ddlPage.SelectedIndexChanged += PageDDL_SelectedIndexChanged;
base.CreateChildControls();
ChildControlsCreated = true;
UpdateRowCountText(); // Assigns the RowCount text to the span control _spanPageCount
UpdatePageCountText(); // The Y in "Page X of Y"
ApplyStandardClassNames();
CreatePageDDLItems(); // Populates Items in PageDDL (if required)
AssignPageDDLSelectedValue(); // Assigns the current PageDDL value (if required)
}
protected virtual ToolbarActionItem CreateToolbarActionItemControls(ToolbarItem item)
{
// Create List Item and add CssClass if required
var li = CreateToolbarActionItem(ToolbarActionType.Action);
if (item.HasCssClass)
li.CssClass = item.CssClass;
if (item.TextOnly)
{
// Text Only Action Items are added as literal text
li.Controls.Add(new Literal() { Text = item.Text });
}
else
{
var btn = new LinkButton() { Text = item.Text, ToolTip = item.ToolTip, CssClass = item.CssClass };
if (item.HasURLLink)
btn.Attributes.Add("href", item.URLLink);
else
{
btn.Click += LinkButton_Clicked;
_map.Add(btn, item); // used if posting back
// btn.Attributes.Add("href", "#");
// var js = MakeButtonJavaScript(item);
// if (js != string.Empty)
// btn.Attributes.Add("onclick", "javascript:" + js);
if(!string.IsNullOrEmpty(item.PrePostbackJSFunction))
btn.OnClientClick = $"return {item.PrePostbackJSFunction}(this);";
}
li.Controls.Add(btn);
}
return li;
}
protected virtual ToolbarActionItem CreateToolbarActionItem(ToolbarActionType type)
{
return new ToolbarActionItem(type);
}
private void CreatePageDDLItems()
{
// No DDL control created yet?
if (!ChildControlsCreated)
return;
var pageCount = PageCount;
// Current count is already correct?
if (pageCount == _ddlPage.Items.Count - 1) // -1 = "all"
return;
_ddlPage.Items.Clear();
_spanPageCount.Visible = (pageCount > 1); // Show this section only if multipage
// Not multi page?
if (pageCount <= 1)
return;
var li = new ListItem("All", "all");
_ddlPage.Items.Add(li);
for (var i = 0; i < pageCount; i++)
{
li = new ListItem((i + 1).ToString());
_ddlPage.Items.Add(li);
}
// AssignPageDDLSelectedValue() is already called whenever CreatePageDDLItems() is called!
//AssignPageDDLSelectedValue();
}
private void AssignPageDDLSelectedValue()
{
if (!ChildControlsCreated)
return;
if (ShowAllPages)
_ddlPage.SelectedValue = "all";
else
_ddlPage.SelectedValue = CurrentPage.ToString();
}
private void LinkButton_Clicked(object sender, EventArgs e)
{
System.Diagnostics.Debug.Assert(sender is LinkButton);
var button = sender as LinkButton;
var item = _map[button];
// Raise event with item's value
OnActionButtonClicked(item.Value);
}
private void PageDDL_SelectedIndexChanged(object sender, System.EventArgs e)
{
System.Diagnostics.Debug.Assert(sender == _ddlPage);
var v = _ddlPage.SelectedValue;
var newShowAllPages = (v == "all");
var newPage = newShowAllPages ? 0 : int.Parse(v);
// No Change?
if (newShowAllPages == ShowAllPages &&
(!newShowAllPages && (newPage == CurrentPage)))
return;
// Assign and raise event
ShowAllPages = newShowAllPages;
CurrentPage = newPage;
OnPageChanged(newShowAllPages, newPage);
}
private void OnActionButtonClicked(string id)
{
var evt = ActionClicked;
// check there are subscribers, and trigger if necessary
if (evt != null)
evt(this, new ToolbarActionClickedEventArgs(id));
}
private void OnPageChanged(bool showAll, int newPageNumber)
{
var evt = PageChanged;
// check there are subscribers, and trigger if necessary
if (evt != null)
evt(this, new ToolbarPageChangedEventArgs(showAll, newPageNumber));
}
}
public class ToolbarPageChangedEventArgs : EventArgs
{
public bool ShowAllPages { get; }
public int NewPageNumber { get; }
internal ToolbarPageChangedEventArgs(bool showAllPages, int newPageNumber)
{
ShowAllPages = showAllPages;
NewPageNumber = newPageNumber;
}
}
public class ToolbarActionClickedEventArgs : EventArgs
{
public string ActionValue { get; }
internal ToolbarActionClickedEventArgs(string value)
{
ActionValue = value;
}
}
public delegate void ToolbarPageChangedEventHandler(object sender, ToolbarPageChangedEventArgs args);
public delegate void ToolbarActionClickedEventHandler(object sender, ToolbarActionClickedEventArgs args);
ToolbarItem.cs
[TypeConverter(typeof(ExpandableObjectConverter))]
public class ToolbarItem
{
public ToolbarItem() : this(string.Empty, string.Empty, string.Empty, string.Empty)
{
}
public ToolbarItem(string text, string value, string jslink, string urllink)
{
Text = text;
Value = value;
JSLink = jslink;
URLLink = urllink;
CssClass = string.Empty;
ToolTip = string.Empty;
PrePostbackJSFunction = string.Empty;
Visible = true;
}
.... snip ...
}
public enum ToolbarActionType
{
None = 0,
PreText = 1,
Action = 2,
}

GridView missing data between postbacks

So basically I am doing a manage packaging item system. The scenario is, when I select from gvSPU, gvFinalised should display the item in database. After that, when I add new item into the gvFinalised, it supposed to keep stacking up the items instead of wiping out the previous record and display the added latest one. Here is the code:
private List<DistributionStandardPackingUnitItems> tempDistSPUI
{
get
{
if (ViewState["tempDistSPUI"] == null)
{
return new List<DistributionStandardPackingUnitItems>();
}
else
{
return (List<DistributionStandardPackingUnitItems>)ViewState["tempDistSPUI"];
}
}
set
{
ViewState["tempDistSPUI"] = value;
}
}
protected void gvSPU_OnRowCommand(object sender, GridViewCommandEventArgs e)
{
int packagesNeeded = prodPackBLL.getPackagesNeededByDistributionID(distributionID);
int rowNo = int.Parse(e.CommandArgument.ToString());
SPUname = this.gvSPU.DataKeys[rowNo].Value.ToString();
lblSPUname.Text = SPUname;
List<DistributionStandardPackingUnitItems> templist = new List<DistributionStandardPackingUnitItems>();
templist = tempDistSPUI;
templist = packBLL.getAllDistSPUItemByDistributionIDnSPUName(distributionID, SPUname);
gvFinalised.DataSource = templist;
gvFinalised.DataBind();
this.tempDistSPUI = templist;
}
When gvSPU row is selected, it should store all the records into templist and display in gvFinalised.
List<string> prodVariantIDList = new List<string>();
private List<string> SelectedVariantDetailIDs
{
get
{
if (ViewState["SelectedVariantDetailIDs"] == null)
{
return new List<string>();
}
else
{
return (List<string>)ViewState["SelectedVariantDetailIDs"];
}
}
set
{
ViewState["SelectedVariantDetailIDs"] = value;
}
}
protected void lbnAdd_Click(object sender, EventArgs e)
{
List<ProductPacking> prodVariantDetail = new List<ProductPacking>();
int packagesNeeded = prodPackBLL.getPackagesNeededByDistributionID(distributionID);
// get the last product variant IDs from ViewState
prodVariantIDList = this.SelectedVariantDetailIDs;
foreach (RepeaterItem ri in Repeater1.Items)
{
GridView gvProduct = (GridView)ri.FindControl("gvProduct");
foreach (GridViewRow gr in gvProduct.Rows)
{
CheckBox cb = (CheckBox)gr.FindControl("cbCheckRow");
//Prevent gvFinalised to store duplicate products
if (cb.Checked && !prodVariantIDList.Any(i => i == gvProduct.DataKeys[gr.RowIndex].Value.ToString()))
{
// add the corresponding DataKey to idList
prodVariantIDList.Add(gvProduct.DataKeys[gr.RowIndex].Value.ToString());
}
}
}
for (int i = 0; i < prodVariantIDList.Count; i++)
{
prodVariantDetail.Add(prodPackBLL.getProdVariantDetailByID(prodVariantIDList[i]));
}
gvFinalised.DataSource = prodVariantDetail;
gvFinalised.DataBind();
// save prodVariantIDList to ViewState
this.SelectedVariantDetailIDs = prodVariantIDList;
}
When add button is on click, it should append with the record in gridview instead of wiping them off and insert the checked one.
I am using the viewState to store the record between postbacks. However, when I try to add new item into gvFinalised, the previous record which in the templist will disappear and the gvFinalised will be populated with the result from prodVariantDetail list.
Any guide? Thanks in advance.
EDIT
List<DistributionStandardPackingUnitItems> itemList = new List<DistributionStandardPackingUnitItems>();
protected void gvSPU_OnRowCommand(object sender, GridViewCommandEventArgs e)
{
int packagesNeeded = prodPackBLL.getPackagesNeededByDistributionID(distributionID);
int rowNo = int.Parse(e.CommandArgument.ToString());
SPUname = this.gvSPU.DataKeys[rowNo].Value.ToString();
lblSPUname.Text = SPUname;
itemList = tempDistSPUI;
itemList = packBLL.getAllDistSPUItemByDistributionIDnSPUName(distributionID, SPUname);
gvFinalised.DataSource = itemList;
gvFinalised.DataBind();
this.tempDistSPUI = itemList;
}
protected void lbnAdd_Click(object sender, EventArgs e)
{
List<DistributionStandardPackingUnitItems> prodVariantDetail = new List<DistributionStandardPackingUnitItems>();
int packagesNeeded = prodPackBLL.getPackagesNeededByDistributionID(distributionID);
// get the last product variant IDs from ViewState
prodVariantIDList = this.SelectedVariantDetailIDs;
foreach (RepeaterItem ri in Repeater1.Items)
{
GridView gvProduct = (GridView)ri.FindControl("gvProduct");
foreach (GridViewRow gr in gvProduct.Rows)
{
CheckBox cb = (CheckBox)gr.FindControl("cbCheckRow");
//Prevent gvFinalised to store duplicate products
if (cb.Checked && !prodVariantIDList.Any(i => i == gvProduct.DataKeys[gr.RowIndex].Value.ToString()))
{
// add the corresponding DataKey to idList
prodVariantIDList.Add(gvProduct.DataKeys[gr.RowIndex].Value.ToString());
}
}
}
for (int i = 0; i < prodVariantIDList.Count; i++)
{
prodVariantDetail.Add(packBLL.getProdVariantDetailByID(prodVariantIDList[i]));
}
for (int j = 0; j < itemList.Count; j++)
{
prodVariantDetail.Add(itemList[j]);
}
gvFinalised.DataSource = prodVariantDetail;
gvFinalised.DataBind();
}
// save prodVariantIDList to ViewState
this.SelectedVariantDetailIDs = prodVariantIDList;
}

You have to add the elements of tempDistSPUI into prodVariantDetail before binding prodVariantDetail to gvFinalised.
Here's what I would do using List.AddRange Method:
protected void lbnAdd_Click(object sender, EventArgs e)
{
List<DistributionStandardPackingUnitItems> prodVariantDetail = new List<DistributionStandardPackingUnitItems>();
int packagesNeeded = prodPackBLL.getPackagesNeededByDistributionID(distributionID);
// get the last product variant IDs from ViewState
prodVariantIDList = this.SelectedVariantDetailIDs;
foreach (RepeaterItem ri in Repeater1.Items)
{
GridView gvProduct = (GridView)ri.FindControl("gvProduct");
foreach (GridViewRow gr in gvProduct.Rows)
{
CheckBox cb = (CheckBox)gr.FindControl("cbCheckRow");
//Prevent gvFinalised to store duplicate products
if (cb.Checked && !prodVariantIDList.Any(i => i == gvProduct.DataKeys[gr.RowIndex].Value.ToString()))
{
// add the corresponding DataKey to idList
prodVariantIDList.Add(gvProduct.DataKeys[gr.RowIndex].Value.ToString());
}
}
}
for (int i = 0; i < prodVariantIDList.Count; i++)
{
prodVariantDetail.Add(packBLL.getProdVariantDetailByID(prodVariantIDList[i]));
}
// get the content of tempDistSPUI from ViewState
itemList = this.tempDistSPUI;
// add all elements of itemList to prodVariantDetail
prodVariantDetail.AddRange(itemList);
gvFinalised.DataSource = prodVariantDetail;
gvFinalised.DataBind();
// save prodVariantIDList to ViewState
this.SelectedVariantDetailIDs = prodVariantIDList;
}

"Select All" in CheckBoxList

I have some working code, but I don't think it's the best way to achieve what I'm going for.
I have a CheckBoxList with 5 items - 4 individual items and 1 "Select All" item. When the Select All is selected, I want the other 4 to be checked off for the user. When the Select All is deselected, I want the other 4 to be unchecked for the user.
A bunch of things I've found on StackOverflow and Google simply suggest looping through CheckBoxList.Items, but this will not work for my case. For instance, say a user unchecked Item #3 - this would trigger the OnSelectedIndexChanged event, at which point I would begin looping through the Items. I would find that the "Select All" item is not selected, so I'd therefore deselect all items. Thus, a user would check off Item #3 only to have it be immediately deselected for them.
Below is my working code, but it uses some strange functions and I can't imagine that it's the best way to achieve what I'm looking for.
protected void StatusCheckBoxListChanged(object sender, System.EventArgs e)
{
//Crazy code I found online to determine which item triggered the event
CheckBoxList list = (CheckBoxList)sender;
string[] control = Request.Form.Get("__EVENTTARGET").Split('$');
int index = control.Length - 1;
ListItem li = (ListItem)list.Items[Int32.Parse(control[index])];
if (li.ToString().Equals("Select All")) //If it was the "Select All" Item which triggered the event
{
//If it was checked, check off everything. If it was unchecked, uncheck everything.
for(int i = 0; i < StatusCheckBoxList.Items.Count; i++)
{
StatusCheckBoxList.Items[i].Selected = StatusCheckBoxList.Items.FindByValue("Select All").Selected;
}
}
}

you can try add field to you page that was show previous value for Select All like this
bool SelectAll;
init it in PageLoad event handler, something like this
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostback){
SelectAll = StatusCheckBoxList.Items.Cast<ListItem>().FirstOrDefault(d => d.Text == "Select All" && d.Selected) != null;
}
}
and change your event like this
protected void StatusCheckBoxListChanged(object sender, System.EventArgs e)
{
if(SelectAll != (StatusCheckBoxList.Items.Cast<ListItem>().FirstOrDefault(d => d.Text == "Select All" && d.Selected) != null)){
SelectAll = !SelectAll;
foreach(var li in StatusCheckBoxList.Items){
li.Selected = SelectAll;
}
}
}
NOTE: if you know position of item with "Select All" value you can do without LINQ something like this
Sample for case when "Select All" is first item
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostback){
SelectAll = StatusCheckBoxList.Items[0].Selected;
foreach(var li in StatusCheckBoxList.Items){
li.Selected = SelectAll;
}
}
}
and change your event like this
protected void StatusCheckBoxListChanged(object sender, System.EventArgs e)
{
if(SelectAll != StatusCheckBoxList.Items[0].Selected){
SelectAll = !SelectAll;
foreach(var li in StatusCheckBoxList.Items){
li.Selected = SelectAll;
}
}
}

I've worked around this in the past by setting a flag e.g.
public class MyClass
{
bool _IsReady = true;
protected void StatusCheckBoxListChanged(object sender, System.EventArgs e)
{
if (!_IsReady)
{
return;
}
//Crazy code I found online to determine which item triggered the event
CheckBoxList list = (CheckBoxList)sender;
string[] control = Request.Form.Get("__EVENTTARGET").Split('$');
int index = control.Length - 1;
ListItem li = (ListItem)list.Items[Int32.Parse(control[index])];
if (li.ToString().Equals("Select All")) //If it was the "Select All" Item which triggered the event
{
SetAllStatusItemsSelected(StatusCheckBoxList.Items.FindByValue("Select All").Selected);
}
}
private void SetAllStatusItemsSelected(bool IsSelected)
{
_IsReady = false;
//If it was checked, check off everything. If it was unchecked, uncheck everything.
for(int i = 0; i < StatusCheckBoxList.Items.Count; i++)
{
StatusCheckBoxList.Items[i].Selected = StatusCheckBoxList.Items.FindByValue("Select All").Selected;
}
_IsReady = true;
}
}
I'd be interested to know if there is a more elegant way.

This the way I have always solved this issue
protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e)
{
CheckBoxList lstBx = (CheckBoxList)sender;
List<ListItem> list = lstBx.Items.Cast<ListItem>().ToList();
string[] control = Request.Form.Get("__EVENTTARGET").Split('$');
int index = Convert.ToInt32(control[control.Length - 1]);
ListItem selectAllControl = list.FirstOrDefault(x => x.Text == "Select All");
ListItem selectAll = list.FirstOrDefault(x => x.Selected && x.Text == "Select All");
if (index == 0)
{
if (selectAll != null)
{
foreach (var item in list)
{
item.Selected = true;
}
}
}
else
{
if (selectAllControl != null)
{
selectAllControl.Selected = false;
}
}
}

C#, How to get HTML generated textbox values during foreach Control loop and then show the result?

Behind the code C#, when the user select 3(dropdownlist) then press execute button, it will auto generate 3 textboxes. After user fill out names on 3 textboxes then click request button, I want the 3 names that user entered display on different result textbox. How do I do that?
Here are C# codes,
protected void ExecuteCode_Click(object sender, EventArgs e)
{
int amount = Convert.ToInt32(DropDownListIP.SelectedValue);
for (int num = 1; num <= amount; num++)
{
HtmlGenericControl div = new HtmlGenericControl("div");
TextBox t = new TextBox();
t.ID = "textBoxName" + num.ToString();
div.Controls.Add(t);
div1.Controls.Add(div);
}
ButtonRequest.Visible = true;
}
protected void ButtonRequest_Click(object sender, EventArgs e)
{
string str = "";
foreach (Control c in phDynamicTextBox.Controls)
{
try
{
TextBox t = (TextBox)c;
// gets textbox ID property
//Response.Write(t.ID);
str = t.Text;
}
catch
{
}
}
TextBoxFinal.Text = str;
}
Then HTML codes,
<div id="div1" runat="server">
<asp:PlaceHolder ID="phDynamicTextBox" runat="server" />
</div>

you cannot access to control that create dynamically on postback, but you can try get input value from request like this
protected void ExecuteCode_Click(object sender, EventArgs e)
{
List<string> tbids = new List<string>();
int amount = Convert.ToInt32(DropDownListIP.SelectedValue);
for (int num = 1; num <= amount; num++)
{
HtmlGenericControl div = new HtmlGenericControl("div");
TextBox t = new TextBox();
t.ID = "textBoxName" + num.ToString();
div.Controls.Add(t);
phDynamicTextBox.Controls.Add(div);
tbids.Add(t.ID);
}
Session["tbids"] = tbids;
ButtonRequest.Visible = true;
}
protected void ButtonRequest_Click(object sender, EventArgs e)
{
string str = "";
var tbids = (List<string>)Session["tbids"];
foreach (var id in tbids)
{
try
{
str += Request[id]+" "; //here get value tb with id;
}
catch
{
}
}
TextBoxFinal.Text = str;
}

One option is:
when you create the textbox you save the Id in a list in session, then you through the list and use it:
TextBox myTextbox = (TextBox)FindControl("name");
example:
List<string> list = (List<string>)Session["myList"];
TextBox myTextbox;
foreach (string item in list)
{
myTextbox = (TextBox)FindControl(item);
//in myTextbox you have the atribute Text with the informatcion
}
Sorry for my english.

Tag Array c# winforms

The code below lets me show emails received in a listview on when the selected index is changed displays the body of the selected email in a RTB. The problem is i changed the code to work with a data grid view and now the Tag part wont work
void SomeFunc() // This line added by Jon
{
int i;
for (i = 0; i < bundle.MessageCount; i++)
{
email = bundle.GetEmail(i);
ListViewItem itmp = new ListViewItem(email.From);
ListViewItem.ListViewSubItem itms1 =
new ListViewItem.ListViewSubItem(itmp, email.Subject);
ListViewItem.ListViewSubItem itms2 =
new ListViewItem.ListViewSubItem(itmp, email.FromName);
itmp.SubItems.Add(itms1);
itmp.SubItems.Add(itms2);
listView1.Items.Add(itmp).Tag = i;
richTextBox1.Text = email.Body;
}
// Save the email to an XML file
bundle.SaveXml("email.xml");
}
private void listView1_SelectionChanged(object sender, EventArgs e)
{
if (listView1.SelectedCells.Count > 0)
{
// bundle is now accessible in your event handler:
richTextBox1.Text = bundle.GetEmail((int)listView1.SelectedCells[0].Tag).Body;
}
}
Code for data grid view
int i;
for (i = 0; i < bundle.MessageCount; i++)
{
email = bundle.GetEmail(i);
string[] row = new string[] { email.From, email.Subject, email.FromName };
object[] rows = new object[] { row };
foreach (string[] rowArray in rows)
{
dataGridView1.Rows.Add(rowArray);
}
} // This line added by Jon

i have created earlier the code for datagrid view but you already done it so i haven't posted in your last question but i think , you should give a try to the below code.
// i am creating a new object here but , you can have a single object on the form
DataGridView dgv = new DataGridView();
private DataTable EmailSource { get; set; }
dgv.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
dgv.SelectionChanged+=new EventHandler(dgv_SelectionChanged);
Chilkat.MessageSet msgSet = imap.Search("ALL", true);
if (msgSet != null)
{
bundle = imap.FetchBundle(msgSet);
CreateDataTable();
if (bundle != null && dt!=null)
{
Chilkat.Email email;
int i;
for (i = 0; i < bundle.MessageCount; i++)
{
email = bundle.GetEmail(i);
if(email!=null)
{
DataRow drow = EmailSource.NewRow();
drow["Id"] = i.ToString();
drow["From"] = email.FromName;
drow["Subject"] = email.Subject;
drow["DateRecived"] = email.DateRecived;
// i am adding email body also
drow["Body"] =email.Body;
EmailSource.Rows.Add(drow);
}
}
// Save the email to an XML file
bundle.SaveXml("email.xml");
dgv.DataSource= EmailSource;
// Hiding Body from the grid
dgv.Columns["Body"].Visible =false;
}
}
// this event handler will show the last selected email.
void dgv_SelectionChanged(object sender, EventArgs e)
{
DataGridViewSelectedRowCollection rows = dgv.SelectedRows;
if (rows != null)
{
// get the last selected row
DataRow drow = rows[rows.Count - 1].DataBoundItem as DataRow;
if (drow != null)
{
richTextBox1.Text = drow["Body"];
}
}
}
private void CreateDataTable()
{
EmailSource = new DataTable();
EmailSource.Columns.Add("Id");
EmailSource.Columns.Add("From");
EmailSource.Columns.Add("Subject");
EmailSource.Columns.Add("DateRecived");
EmailSource.Columns.Add("Body");
}

You are adding rows using listView1.Rows.Add(rowArray) in both the code listings. Is that a typo or you named the GridView like that.
Basically, you are storing the index of the email in the "Tag" property.
listView1.Items.Add(itmp).Tag = i;
You need to make sure that you do the same while adding items to the GridView too.

The DataGridView does not have an "Items" collection. To make it work, you need to bind the DataGridView to a collection of objects. Something like this should get you started:
List<Email> emails = new List<Email>();
for (i = 0; i < bundle.MessageCount; i++)
{
email = bundle.GetEmail(i);
emails.Add(email);
}
dataGridView.ItemsSource = emails;
You should not need to store the row index for each item in a "Tag" object - you can can get the selected index like this:
int selectedIndex = dataGridView.SelectedCells[0].RowIndex;