I a newbie to asp.net. I have created a DB table in sqlserver with 3 columns; ImageID, Filename & Score.
FileName is C:\pics\beads.png or C:\pics\moreimages\scenary.jpeg.
Using C# asp.net, I have created a GridView. This Gridview should populate
(column 1)ImageID and get the image from the Filename (column2) and I have 2 Checkboxlist created as shown below which should accept score for the images from user and save it into the DB table.
Question 1 .
I am able to populate Image ID, but Images are not getting populated.
Question 2.
I do not know how to access the checkboxlist since it is in template. The checked is in the default select and doesn't change even if I click on it. Which method/property should be used to do save the selection to the database. Here's my code
<form id="form1" runat="server">
<p style="height: 391px">
<asp:GridView ID="GridView1" runat="server" Caption="Logos" Height="299px" Width="577px" AutoGenerateColumns="False">
<Columns>
<asp:BoundField DataField="ImageID" HeaderText="ImageID" />
<asp:ImageField DataImageUrlField="FileName" ControlStyle-Width="100"
ControlStyle-Height="100" HeaderText="Image" AlternateText="No image">
<ControlStyle Height="100px" Width="100px"></ControlStyle>
</asp:ImageField>
<asp:TemplateField HeaderText="Score" AccessibleHeaderText="CheckBoxList" ValidateRequestMode="Enabled">
<ItemTemplate>
<asp:CheckBoxList runat="server" AutoPostBack="true" RepeatColumns="3" ID="test">
<asp:ListItem Selected="True" Value="5">Good</asp:ListItem>
<asp:ListItem Value="0">Not Good </asp:ListItem>
<asp:ListItem Value="3">OK</asp:ListItem>
</asp:CheckBoxList>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Save" Width="130px" />
<asp:Button ID="Button2" runat="server" OnClientClick="javaScript:window.close(); return false;" Text="Exit" Width="102px" />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</p>
</form>
public string sqlSel = #"SELECT TOP 3 [ImageID],FileName FROM [db1].[ImagesTest] where [Score] is null";
protected void Page_Load(object sender, EventArgs e)
{
using (SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["SQLConnectionString"].ConnectionString))
{
connection.Open();
SqlCommand cmdSel = new SqlCommand(sqlSel, connection);
SqlDataReader reader1 = cmdSel.ExecuteReader();
while (reader1.Read())
{
DataSet ds = GetData(sqlSel);
if (ds.Tables.Count > 0)
{
GridView1.DataSource = ds;
GridView1.DataBind();
}
else
{
Response.Write("Unable to connect to the database.");
}
}
}
}
private DataSet GetData(string cmdSel)
{
String strConnString = System.Configuration.ConfigurationManager.ConnectionStrings["SQLConnectionString"].ConnectionString;
DataSet ds = new DataSet();
try
{
SqlConnection con = new SqlConnection(strConnString);
SqlDataAdapter sda = new SqlDataAdapter(cmdSel,con);
sda.Fill(ds);
}
catch (Exception ex)
{
Response.Write("IN EXCEPTION "+ex.Message);
return null;
}
return ds;
}
Thanks for ur time
Rashmi
There are several issues with your code, here is what it should be fixed:
How to fix the images (Question 1)
As #Guilherme said in the comments, for images use URLs instead of disk paths.
Replace the images disk paths C:\pics\beads.png or C:\pics\moreimages\scenary.jpeg to something like Images/beads.png and Images/scenary.jpeg.
For this to work, you will need to have a folder named Images that contains these two files on the same directory level as your .aspx file.
Adjust your GridView1 declaration in the ASPX file
On your GridView1 declaration you should:
attach a handler to the OnRowDataBound event. This will allow you to properly bind the Score dataset column to the Score gridview column
set the DataKeyNames property on the grid to what should be the primary key for your images table (in this case DataKeyNames="ImageID")
use a RadioButtonList instead of a CheckboxList, because according to your dataset you can only set one value, which is what the RadioButtonList does. The CheckboxList is normally used when multiple selection is needed.
attach a handler to the SelectedIndexChanged event on the RadioButtonList. This will allow you to save the new values to the database (Question 2)
Here's how your GridView declaration should look like:
<asp:GridView ID="GridView1" runat="server" Caption="Logos" Height="299px" Width="577px" AutoGenerateColumns="False" OnRowDataBound="GridView1_RowDataBound" DataKeyNames="ImageID">
<Columns>
<asp:BoundField DataField="ImageID" HeaderText="ImageID" />
<asp:ImageField DataImageUrlField="FileName" ControlStyle-Width="100"
ControlStyle-Height="100" HeaderText="Image" AlternateText="No image">
<ControlStyle Height="100px" Width="100px"></ControlStyle>
</asp:ImageField>
<asp:TemplateField HeaderText="Score" AccessibleHeaderText="RadioButtonList" ValidateRequestMode="Enabled">
<ItemTemplate>
<asp:RadioButtonList runat="server" AutoPostBack="true" RepeatColumns="3" ID="test" OnSelectedIndexChanged="test_SelectedIndexChanged">
<asp:ListItem Value="5">Good</asp:ListItem>
<asp:ListItem Value="0">Not Good </asp:ListItem>
<asp:ListItem Value="3">OK</asp:ListItem>
</asp:RadioButtonList>
<!-- UPDATED! - keep the old values in a hidden field -->
<asp:HiddenField runat="server" ID="hfOldScore" Value='<%# Eval("Score") %>' />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Adjust your code behind value in your .ASPX.CS file (Question 2)
On the code behind, you will also need to:
Make sure you are binding to the GridView only once in the Page_Load event, by checking the IsPostBack property
(Optional, but recommended) Move the logic of getting data (with the SQLConnection code) in a separate method that will handle only data retrieval
Implement the handler for the OnRowDataBound event. This will bind any values from the Score column to the RadioButtonList control
Implement the handler for the SelectedIndexChecked event of the RadioButtonList control. This will allow you to save to the database the new values
Finally, here's the entire code-behind code:
protected void Page_Load(object sender, EventArgs e)
{
//bind only the first time the page loads
if (!IsPostBack)
{
DataSet ds = GetData(sqlSel);
if (ds.Tables.Count > 0)
{
GridView1.DataSource = ds;
GridView1.DataBind();
}
else
{
Response.Write("Unable to connect to the database.");
}
}
}
private DataSet GetData(string cmdSel)
{
//normally you should query the data from the DB
//I've manually constructed a DataSet for simplification purposes
DataSet ds = new DataSet();
DataTable dt = new DataTable();
dt.Columns.Add(new DataColumn("ImageID", typeof(int)));
dt.Columns.Add(new DataColumn("FileName", typeof(string)));
dt.Columns.Add(new DataColumn("Score", typeof(int)));
dt.Rows.Add(100, #"Images/beads.png", 0);
dt.Rows.Add(200, #"Images/moreimages/scenary.jpeg", 3);
dt.Rows.Add(300, #"Images/moreimages/scenary.jpeg", 5);
ds.Tables.Add(dt);
return ds;
}
protected void Button1_Click(object sender, EventArgs e)
{
//UPDATED - iterate through all the data rows and build a dictionary of items
//to be saved
Dictionary<int, int> dataToUpdate = new Dictionary<int, int>();
foreach (GridViewRow row in GridView1.Rows)
{
if (row.RowType == DataControlRowType.DataRow)
{
int imageID = (int)GridView1.DataKeys[row.RowIndex].Value;
int oldScore;
int newScore;
int.TryParse((row.FindControl("hfOldScore") as HiddenField).Value, out oldScore);
int.TryParse((row.FindControl("test") as RadioButtonList).SelectedValue, out newScore);
if (oldScore != newScore)
{
dataToUpdate.Add(imageID, newScore);
}
}
}
//update only the images that were changed
foreach (var keyValuePair in dataToUpdate)
{
SaveToDB(keyValuePair.Key, keyValuePair.Value);
}
}
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
//we are only interested in the data Rows
if (e.Row.RowType == DataControlRowType.DataRow)
{
DataRow dataRow = (e.Row.DataItem as DataRowView).Row;
//manually bind the Score column to the RadioButtonlist
int? scoreId = dataRow["Score"] == DBNull.Value ? (int?)null : (int)dataRow["Score"];
if (scoreId.HasValue)
{
RadioButtonList test = e.Row.FindControl("test") as RadioButtonList;
test.ClearSelection();
test.SelectedValue = scoreId.Value.ToString();
}
}
}
protected void test_SelectedIndexChanged(object sender, EventArgs e)
{
RadioButtonList test = sender as RadioButtonList;
GridViewRow gridRow = test.NamingContainer as GridViewRow;
//obtain the current image Id
int imageId = (int)GridView1.DataKeys[gridRow.RowIndex].Value;
//obtain the current selection (we will take the first selected checkbox
int selectedValue = int.Parse(test.SelectedValue);
//UPDATED! - saves are now handled on the Save button click
//SaveToDB(imageId, selectedValue);
}
private void SaveToDB(int imageId, int score)
{
//UPDATED!
using (SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["SQLConnectionString"].ConnectionString))
{
connection.Open();
using (SqlCommand command = connection.CreateCommand())
{
command.Parameters.Add("#ImageID", imageId);
command.Parameters.Add("#Score", score);
command.CommandText = #"update [db1].[ImagesTest] set Score = #Score where [ImageID] = #ImageID";
command.ExecuteNonQuery();
}
}
}
UPDATED!
The declaration of the GridView1 now contains a hidden field containing the Score value. You can use this hidden field to determine which row has changed, so you can trigger a save only on the changed ones
Save is now done on the click of the Save button, by iterating through the rows of the grid an building a Dictionary<int,string> to keep only the changes.
SaveToDB method should work, but I cannot test this myself.
Question 2:
To access your checkbox you can use.
GridViewRow row = GridView1.Rows[i];
CheckBox Ckbox = (CheckBox)row.FindControl("test");
For Question 1
Instead of ImageField you can use use ASP:Image in Templatefield like this
<asp:TemplateField HeaderText="Score" AccessibleHeaderText="CheckBoxList" ValidateRequestMode="Enabled">
<ItemTemplate>
<asp:Image ID="imageControl" runat="server" ImageUrl='<%# Eval("Filename") %>'></asp:Image>
</ItemTemplate>
</asp:TemplateField>
For Question 2
This is one of the example for how to access each Checkbox list inside gridview
For Each gvr As GridViewRow In Gridview1.Rows
If (CType(gvr.FindControl("CheckBox1"), CheckBox)).Checked = True Then
ReDim uPrimaryid(iCount)
uPrimaryid(iCount) = New Integer
uPrimaryid(iCount) = gvr.Cells("uPrimaryID").Text
iCount += 1
End If
Next
Related
I am able to retrieve out data from database to show which is Y and N using checkbox in gridview. However now i want to to able to store which checkbox is checked back into the database after editing.
What i did so far:
.aspx
<asp:GridView ID="SiteGridView" runat="server" CssClass="datagrid"
GridLines="Vertical" AutoGenerateColumns="False"
Width="100%"
AllowPaging="True" AllowSorting="True"
DataKeyNames="promoID" OnRowCommand="GvPage_RowCommand"
OnPageIndexChanging="GvPage_PageIndexChanging"
OnSorting="GvPage_Sorting"
OnRowDatabound="SiteGridView_RowDataBound"
OnRowEditing="SiteGridView_RowEditing">
<Columns>
<asp:TemplateField HeaderText="Default">
<ItemTemplate>
<asp:CheckBox ID="process_flag" runat="server"
Checked='<%# bool.Parse(Eval("PROCESSED").ToString()) %>'
Enable='<%# !bool.Parse(Eval("PROCESSED").ToString()) %>' />
</ItemTemplate>
<ItemStyle Width="20%" />
</asp:TemplateField>
</Columns>
</asp:GridView>
CodeBehind:
SqlCommand cmd = new SqlCommand("SELECT * , CAST(CASE defaults WHEN 'Y' THEN 1 ELSE 0 END AS BIT) AS PROCESSED FROM Promotions");
SqlDataAdapter da = new SqlDataAdapter();
DataTable dt = new DataTable();
da.SelectCommand = cmd;
// Save results of select statement into a datatable
da.Fill(dt);
SiteGridView.DataSource = dt;
SiteGridView.DataBind();
protected void SiteGridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
//check userrole & display accrodingly
if (Session["ROLE"].ToString() != "SA")
{
//ImageButton btnEdit = (ImageButton)e.Row.FindControl("btnDelete");
//btnEdit.Visible = false;
SiteGridView.Columns[4].Visible = false;
}
}
}
Have you tried:
Checked='<%# Eval("PROCESSED")%>'
If so, what error messages have you gotten?
For some reason Checkboxes do not trigger GridView RowCommand events. It probably can be done with appropriate calls to ClientScript.GetPostBackEventReference(), but thats a whole other level of complexity. So, in order to act on a CheckBox click and handle events individually:
(NB: I've stripped out much of your coding to clarify my points.)
In your CheckBox set AutoPostBack="true"
Add a handler for OnCheckedChanged.
Make sure the DataKey contains the pk of the row you need to update with the CheckBox State
// Simplified version of your markup
<asp:GridView ID="SiteGridView" runat="server"
DataKeyNames="promoID"
OnRowDataBound="SiteGridView_RowDataBound">
<Columns>
<asp:TemplateField HeaderText="Default">
<ItemTemplate>
<asp:CheckBox ID="process_flag" runat="server"
Checked='<%# bool.Parse(Eval("PROCESSED").ToString()) %>'
Enable='<%# !bool.Parse(Eval("PROCESSED").ToString()) %>'
OnCheckedChanged="process_flag_CheckedChanged" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
In the RowDataBound event, find the CheckBox and add the Row Index as an attribute
// Merge this with your `RowDataBound` event
protected void SiteGridView_RowDataBound( object sender, GridViewRowEventArgs e ) {
if ( e.Row.RowType == DataControlRowType.DataRow ) {
CheckBox cbx = ( CheckBox ) e.Row.FindControl( "CheckBox1" );
cbx.Attributes[ "data-row-idx" ] = e.Row.RowIndex.ToString();
}
}
Handle the CheckChanged event:
// Add this handler to your code
protected void process_flag_CheckedChanged( object sender, EventArgs e )
{
CheckBox cbx = ( CheckBox ) sender;
Int32 rowidx = Convert.ToInt32(cbx.Attributes["data-row-idx"]);
Int32 pk = (Int32) GridView4.DataKeys[rowidx].Value;
// simple way to see event arguments before actually touching the database
GridView4.Caption = string.Format(
"CheckChanged: Row {0}, State: {1}, RowPK: {2} ", rowidx , (cbx.Checked ? "Checked" : "Unchecked"), pk );
// Save Data and rebind the gridview to reflect changes
// Verify your parameters before attempting an actual update
// YourDatabaseCallWithAppropriateParamaters( ... );
GridView1.DataBind();
}
First of all use a foreach loop to findout which rows are checked. Then store ID of those rows in a List.
foreach (GridViewRow row in SiteGridView.Rows)
{
if (row.RowType == DataControlRowType.DataRow)
{
CheckBox chkRow = (row.Cells[0].FindControl("process_flag") as CheckBox);
if (chkRow.Checked)
{
string ID = row.Cells[columnID].Text;
I'm displaying a datatable that selects a number of elements from the database (IncomingsId, Type, Cost, Frequency) and I'm not sure how to delete a row when a button is clicked.
I've tried many solutions so far but nothing is working.
Here is the button I have within my Grid view
<asp:TemplateField HeaderText="Delete">
<ItemTemplate>
<asp:button id="DeleteRowButton" text="Delete Record" onclick="DeleteRowButton_Click" runat="server"/>
</ItemTemplate>
</asp:TemplateField>
And here is the code behind this page were I am creating the datatable.
SqlConnection con;
public _Default()
{
con = new SqlConnection(#"MySQLConnection");
}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
DisplayRecord();
}
}
public DataTable DisplayRecord()
{
string userId = (HttpContext.Current.User.Identity.GetUserId());
SqlDataAdapter Adp = new SqlDataAdapter("select * from Incomings where AspNetUsersId = '" + userId +"'", con);
DataTable Dt = new DataTable();
Dt.AcceptChanges();
Adp.Fill(Dt);
grid1.DataSource = Dt;
grid1.DataBind();
return Dt;
}
public void DeleteRowButton_Click(object sender, EventArgs e)
{
}
Cheers in advance for any help. I'm sure it's a simple resolution
You need a way for your code to know which ID to delete. Here is how I would normally do it:
Replace your button with an ItemTemplate, and add the button in here instead:
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Button Text="Delete" runat="server" CommandArgument='<%# Eval("userId") %>' CommandName="Delete" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
When you have the button this way, you now have access to a CommandArgument and CommandName attributes. Notice the argument I am passing is Eval("userId"), the command name (as you will see later) is used to recognize what action you want to execute (this could be anything, is just a name).
Replace the CommandArgument with whatever value(s) you want to pass to the server, using the name that came from the database/datasource (I am guessing it would be userId).
Then, to capture this you need to implement the RowCommand event of the GridView, and intercept the correct CommandName:
public void GridView1_RowCommand(Object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "Delete")
{
string userId = e.CommandArgument.ToString();
//do something with the id
}
}
Here you have to make sure the CommandName in your button, matches to whatever action you want to execute in the RowCommand. This should do the trick.
Don't forget to bind the event to your GridView:
<asp:GridView OnRowCommand="GridView1_RowCommand" ID="GridView1" runat="server">
...
</asp:GridView>
just use this for the front-end code
<asp:GridView ID="grid1" OnRowDeleting="OnRowDeleting" DataKeyNames="deleteR" runat="server" AutoGenerateColumns="False" CellPadding="4" GridLines="None" style="width:100%" >
<columns>
<asp:TemplateField HeaderText="Delete Row">
<ItemTemplate>
<asp:Button ID="btnDelete" runat="server" class="btn btn-primary" Text="Delete" CommandName="Delete" OnRowDataBound="OnRowDataBound" />
</ItemTemplate>
</asp:TemplateField>
And have this in behind it:
protected void OnRowDeleting(object sender, GridViewDeleteEventArgs e)
{
int deleteR= Convert.ToInt32(grid1.DataKeys[e.RowIndex].Values[0]);
//have a sql statement here that add's the parameter ID for the row you want to delete, something like
SqlCommand com = new SqlCommand ("Delete FROM yourdatabase Where yourID = #yourID"
com.Parameters.AddWithValue("#yourID", yourID)
}
What you're looking for is indeed a simple solution.
You can use a foreach loop to search all DataRows within the DataTable for some kind of ID.Here's an example of what I mean:
String s = "/* IncomingsId for what you want to delete */";
foreach (DataRow r in dt.Rows) {
if (r["IncomingsId"].ToString().Equals(s)) {
dt.Rows.Remove(r);
}
}
Just a quick update for anyone that's helped me, thanks for your advice.
Asp.Net has it's own built in AutoGenerateDeleteButton and I set that to true and ran a bit of code behind it.
A simple solution that really shouldn't have taken me all day to complete!
I have a gridview control and I want to input a value to a textbox and click button so that it inserts a value from textbox.text to the gridview. I use this code:
<asp:TextBox ID="txtName" runat="server" ViewStateMode="Enabled"></asp:TextBox>
<br />
<asp:Button ID="btnAddName" runat="server" Text="Button"
onclick="btnAddName_Click" />
<br />
<br />
<asp:GridView ID="gvName" runat="server" ViewStateMode="Enabled">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="lblName" runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
and:
protected void btnAddName_Click(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Columns.Add(new DataColumn("lblName", typeof(string)));
DataRow _dr = dt.NewRow();
_dr["lblName"] = txtName.Text;
dt.Rows.Add(_dr);
gvName.DataSource = dt;
gvName.DataBind();
}
I input the text in the textbox and click on the button to insert a value to the gridview. It works ok, but on the second step, after page postback it lost previous data in the gridview.
I want to not lose the previous data in the gridview. Please help me.
You need to add row to original source you are binding to GridView. if you create new table each time you click button and bind that to gridview, it will show data from new DataTable and old data.
try this
protected void btnAddName_Click(object sender, EventArgs e)
{
DataTable dt;
if(Session["dt"] == null)
{
dt = new DataTable();
dt.Columns.Add(new DataColumn("lblName", typeof(string)));
}
else
{
dt = (DataTable)Session["dt"];
}
DataRow _dr = dt.NewRow();
_dr["lblName"] = txtName.Text;
dt.Rows.Add(_dr);
gvName.DataSource = dt;
gvName.DataBind();
Session["dt"] = dt;
//store dt in session so that you can reuse it again after postback
}
Are you checking in your Page_Load Method if your page is in PostBack mode?
if(IsPostBack) { //Load the data for the first time }
If not, your originally and "old" data will be bind to the gridview.
Update:
To reuse the old data, store the datatable in a session variable, load it from there, add the new line and bind data datatable again.
Am using the below code to bind the dropdown data from another table. And also refer that control name using rowindex. But it always return null.And also return the error message.
`Object reference not set to an instance of an object.`
Am using the two method, but both return the control name null
First code:
protected void GridView2_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
Control ctrl = e.Row.FindControl("DDL_STATUS_FT"); //It always return null
if (ctrl != null)
{
DropDownList dd = ctrl as DropDownList;
DataSet7TableAdapters.sp_getall_trv_masterTableAdapter TA = new DataSet7TableAdapters.sp_getall_trv_masterTableAdapter();
DataSet7.sp_getall_trv_masterDataTable DS = TA.GetData();
dd.DataTextField = "fld_TName";
dd.DataValueField = "fld_id";
dd.DataSource = DS;
dd.DataBind();
}
}
}
Second :
In databind function
if (DS.Rows.Count > 0)
{
GridView2.DataSource = DS;
GridView2.DataBind();
foreach (GridViewRow grdRow in GridView2.Rows)
{
DataSet7TableAdapters.sp_getall_trv_masterTableAdapter TA1 = new DataSet7TableAdapters.sp_getall_trv_masterTableAdapter();
DataSet7.sp_getall_trv_masterDataTable DS1 = TA1.GetData();
// Nested DropDownList Control reference is passed to the DrdList object. This will allow you access the properties of dropdownlist placed inside the GridView Template column.
DropDownList drdList = (DropDownList)(GridView2.Rows[grdRow.RowIndex].Cells[4].FindControl("DDL_STATUS_FT"));//It always return null
// DataBinding of nested DropDownList Control for each row of GridView Control.
drdList.DataSource = DS1;
drdList.DataValueField = "fld_id";
drdList.DataTextField = "fld_TName";
drdList.DataBind();
}
}
Please help me to do this..
<asp:TemplateField ItemStyle-Width="100px" HeaderText="TYPE">
<ItemTemplate>
<asp:DropDownList ID="DDL_STATUS" runat="server" AutoPostBack="true" Enabled="false" >
</asp:DropDownList>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="DDL_edit_STATUS" runat="server" AutoPostBack="true" SelectedValue='<%# Eval("fld_Type") %>'>
</asp:DropDownList>
</EditItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="DDL_STATUS_FT" runat="server" AutoPostBack="true">
</asp:DropDownList>
</FooterTemplate>
</asp:TemplateField>
The DropDown "DDL_STATUS_FT" is in Footer Template..You must check it as follow..
if(e.Row.RowType == DataControlRowType.Footer)
{
DropDownList ctrl =(DropDownList)e.Row.Cells[CellIndex].FindControl("DDL_STATUS_FT");
}
Try to find your control by cell and cellIndex like...
Control ctrl = e.Row.Cells[yourCellIndex].FindControl("DDL_STATUS_FT");
EDITED2
you must have dropdownlist in aspx code in gridview item-template
you are finding using e.row.findcontrol without declaring it so abusively it return null
so, fist add dropdownlist into your gridview
here is a sample of your dropdownlist
<asp:TemplateField ItemStyle-Width="30px" HeaderText="DDL_STATUS_FT">
<ItemTemplate>
<asp:Dropdownlist ID="DDL_STATUS_FT" runat="server" />
</ItemTemplate>
</asp:TemplateField>
if you got null ctrl
Control ctrl = e.Row.FindControl("DDL_STATUS_FT"); //It always return null
then make sure in your aspx code DDL_STATUS_FT Control is runat="server"
I am trying to display rows from my database based on the primary key when the select button is clicked.
<asp:Panel ID="pnlView" runat="server">
<p>
<asp:Label ID="lblTitle" runat="server" Text="Label"></asp:Label></p>
<p>
<asp:Label ID="lblBody" runat="server" Text="Label"></asp:Label></p>
</asp:Panel>
<asp:GridView ID="GridView1" runat="server" DataSourceID="sdsDocuments" EnableModelValidation="True"
SelectedIndex="0" OnSelectedIndexChanged="GridView1_SelectedIndexChanged">
<Columns>
<asp:CommandField ShowSelectButton="True" />
</Columns>
</asp:GridView>
protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
lblTitle.Text = GridView1.SelectedRow.ToString();
lblBody.Text = GridView1.SelectedIndex.ToString();
SqlConnection thisConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["blcDocumentationConnectionString"].ConnectionString);
// Create Command Object
SqlCommand nonqueryCommand = thisConnection.CreateCommand();
try
{
// Open Connection
thisConnection.Open();
// Create INSERT statement with named parms
nonqueryCommand.CommandText = "SELECT DocumentTitle,DocumentBody FROM tblDocument WHERE DocumentID = #DocumentID";
// Add parms to Command parms collection
nonqueryCommand.Parameters.Add("#DocumentID", SqlDbType.Int);
// Execute query statement
nonqueryCommand.ExecuteNonQuery();
}
catch (SqlException ex)
{
}
finally
{
// Close Connection
thisConnection.Close();
}
In the GridView1_SelectedIndexChanged event, I can't see that you have set value for your parameter #DocumentID
Replace this nonqueryCommand.Parameters.Add("#DocumentID", SqlDbType.Int);
with this one nonqueryCommand.Parameters.AddWithValue("#DocumentID", GridView1.SelectedValue);
Edit: Following your comment, that you also need to display the text in your label, do like...
GridViewRow row = GridView1.SelectedRow;
lblTitle.Text = row.Cells[TitleCellIndex].Text;
lblBody.Text = row.Cells[BodyCellIndex].Text
You are not passing a value in to your SQL parameter for the documentid. If you have your grid populated correctly, the current row value is inside the EventArgs e variable.