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dropdownlist name has a SelectedValue which is invalid because it does not exist in the list of items

What I want to achieve is when I click on edit, the Blogtype field in the gridview will be changed to dropdownlist. And Since my database have 3 data in the blogtype which is community work, competition and overseas experience. The dropdownlist will be allows me to select either of these three. After choosing either of this one, and I clicked update, it will be updated in the database. How to do it as I have error in the 3rd screenshot.The name of my dropdownlist for blogtype field is ddlBlogType. help
But for my current code, after clicking edit, it will come out this error. 'ddlBlogType' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value
Source Code
<asp:GridView ID="grdBlog" runat="server" style=
"margin-left: 0px" Width="1000px" Height="147px" AutoGenerateColumns="False"
onrowcancelingedit="grdBlog_RowCancelingEdit" onrowediting="grdBlog_RowEditing"
onrowupdating="grdBlog_RowUpdating" DataKeyNames="BlogID"
onrowdeleting="grdBlog_RowDeleting" AllowPaging="True"
onpageindexchanging="grdBlog_PageIndexChanging" PageSize="5"
BackColor="White" BorderColor="White" BorderStyle="Ridge" BorderWidth="2px"
CellPadding="3" CellSpacing="1" GridLines="None" >
<Columns>
<asp:BoundField DataField="BlogID" HeaderText="BlogID" ReadOnly="true"
SortExpression="BlogID" />
<asp:TemplateField HeaderText="Name">
<EditItemTemplate>
<asp:TextBox ID="txtName" runat="server" Width="80px" Text='<%# Bind("Name") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("Name") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="BlogType">
<EditItemTemplate>
<asp:DropDownList ID="ddlBlogType" runat="server" Width="80px" Text='<%# Bind("BlogType") %>'></asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Bind("BlogType") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Description">
<EditItemTemplate>
<asp:TextBox ID="txtDescription" runat="server" Width="80px" Text='<%# Bind("Description") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label3" runat="server" Text='<%# Bind("Description") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="DateEntry" HeaderText="Date Entry" ReadOnly="true" />
<asp:TemplateField HeaderText="Blog Story">
<EditItemTemplate>
<asp:TextBox ID="txtBlogStory" runat="server" TextMode="multiline" rows="10" Text='<%# Bind("BlogStory") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label5" runat="server" Text='<%# Bind("BlogStory") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="modifiedby" HeaderText="Last Modified By" ReadOnly="true" />
<asp:BoundField DataField="modifieddate" HeaderText="Last Modified Date" ReadOnly="true" />
<asp:CommandField ShowEditButton="True" CausesValidation="false" />
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False"
CommandName="Delete" Text="Delete" OnClientClick="javascript : return confirm('Confirm delete this record?');"></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<FooterStyle BackColor="#C6C3C6" ForeColor="Black" />
<HeaderStyle BackColor="#4A3C8C" Font-Bold="True" ForeColor="#E7E7FF" />
<PagerStyle BackColor="#C6C3C6" ForeColor="Black" HorizontalAlign="Right" />
<RowStyle BackColor="#DEDFDE" ForeColor="Black" />
<SelectedRowStyle BackColor="#9471DE" Font-Bold="True" ForeColor="White" />
<SortedAscendingCellStyle BackColor="#F1F1F1" />
<SortedAscendingHeaderStyle BackColor="#594B9C" />
<SortedDescendingCellStyle BackColor="#CAC9C9" />
<SortedDescendingHeaderStyle BackColor="#33276A" />
</asp:GridView>
Code Behind Code
if (Page.IsPostBack == false)
{
bindResultGridView();
}
private void bindResultGridView()
{
String ConStr = ConfigurationManager.ConnectionStrings["BlogConnectionString"].ConnectionString;
SqlConnection con = new SqlConnection(ConStr);
try
{
String SQL = null;
SQL = "SELECT BlogID, Name, Blogtype, Description, convert(varchar,Dateentry, 103) as Dateentry, BlogStory, modifiedby, convert(varchar,modifieddate, 103) as modifieddate FROM [EntryTable] ORDER BY BlogID DESC";
SqlCommand cmd = new SqlCommand(SQL, con);
con.Open();
SqlDataReader reader = cmd.ExecuteReader();
DataTable dt = new DataTable();
dt.Load(reader);
grdBlog.DataSource = dt;
grdBlog.DataBind();
reader.Close();
}
finally
{
con.Close();
}
}
protected void grdBlog_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
grdBlog.EditIndex = -1;
bindResultGridView();
}
protected void grdBlog_RowEditing(object sender, GridViewEditEventArgs e)
{
grdBlog.EditIndex = e.NewEditIndex;
bindResultGridView();
}
protected void grdBlog_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
int selectedRow = e.RowIndex; //get selected row
// get product id from data key
int blogid = (int)grdBlog.DataKeys[selectedRow].Value;
// get current grid view row
GridViewRow row = (GridViewRow)grdBlog.Rows[selectedRow];
TextBox name = (TextBox)row.FindControl("txtName");
// find text box for txtPrice
DropDownList blogtype = (DropDownList)row.FindControl("ddlBlogType");
TextBox description = (TextBox)row.FindControl("txtDescription");
TextBox blogstory = (TextBox)row.FindControl("txtBlogStory");
// Remove $ sign
string strName = name.Text;
string strBlogType = blogtype.Text;
string strDescription = description.Text;
string strBlogStory = blogstory.Text;
/*
DateTime datDate;
*/
/*
if (DateTime.TryParseExact(strDateEntry, new string[] { "dd/MM/yyyy" },
System.Globalization.CultureInfo.InvariantCulture,
System.Globalization.DateTimeStyles.None, out datDate))
{
*/
updateBlogGridviewRecord(blogid, strName, strBlogType, strDescription, strBlogStory);
/*
}
else
{
lblError.Visible = true;
lblError.Text = "Invalid Date";
lblSuccess.Visible = false;
}
*/
}
private void updateBlogGridviewRecord(int blogid, string strName, string strBlogType, string strDescription, string strBlogStory)
{
try
{
string strConnectionString = ConfigurationManager.ConnectionStrings["BlogConnectionString"].ConnectionString;
SqlConnection myConnect = new SqlConnection(strConnectionString);
string strCommandText = "UPDATE EntryTable SET [ModifiedBy]=#Modifier, [ModifiedDate] = GETDATE(), [Name]=#Name, [BlogType]=#BlogType, [Description]=#Description, [BlogStory]=#BlogStory WHERE [BlogID]=#BlogID";
/*string strCommandText = "UPDATE EntryTable SET [Name]=#Name, [BlogType]=#BlogType, [Description]=#Description, [DateEntry]=#DateEntry, [BlogStory]=#BlogStory WHERE [BlogID]=#BlogID"; */
/*string strCommandText = "UPDATE EntryTable SET [ModifiedBy] = [Name], [Name]=#Name, [BlogType]=#BlogType, [Description]=#Description, [DateEntry]=#DateEntry, [BlogStory]=#BlogStory WHERE [BlogID]=#BlogID"; */
SqlCommand cmd = new SqlCommand(strCommandText, myConnect);
cmd.Parameters.AddWithValue("#BlogID", blogid);
cmd.Parameters.AddWithValue("#Name", strName);
cmd.Parameters.AddWithValue("#BlogType", strBlogType);
//cmd.Parameters.AddWithValue("#DateEntry", datDate);
cmd.Parameters.AddWithValue("#Description", strDescription);
cmd.Parameters.AddWithValue("#BlogStory", strBlogStory);
cmd.Parameters.AddWithValue("#Modifier", Session["Username"]);
myConnect.Open();
int result = cmd.ExecuteNonQuery();
if (result > 0)
{
lblSuccess.Visible = true;
lblSuccess.Text = "Record updated!";
lblError.Visible = false;
}
else
{
lblSuccess.Visible = true;
lblError.Text = "Update fail";
lblError.Visible = false;
}
myConnect.Close();
//Cancel Edit Mode
grdBlog.EditIndex = -1;
bindResultGridView();
}
catch
{
lblError.Visible = true;
lblError.Text = "Invalid Data";
lblSuccess.Visible = false;
}
}
Did it using the edited code below
Source Code
<asp:TemplateField HeaderText="BlogType">
<EditItemTemplate>
<asp:DropDownList ID="ddlBlogType" runat="server" DataTextField="ddlBlogType" DataValueField="ddlBlogType" SelectedValue='<%# Eval("blogType") %>'>
<asp:ListItem Enabled="true" Text="Community Work" Value="Community Work"></asp:ListItem>
<asp:ListItem Text="Competition" Value="Competition"></asp:ListItem>
<asp:ListItem Text="Overseas Experience" Value="Overseas Experience"></asp:ListItem>
</asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Bind("BlogType") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
Code behind Code
protected void grdBlog_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
int selectedRow = e.RowIndex; //get selected row
// get product id from data key
int blogid = (int)grdBlog.DataKeys[selectedRow].Value;
// get current grid view row
GridViewRow row = (GridViewRow)grdBlog.Rows[selectedRow];
TextBox name = (TextBox)row.FindControl("txtName");
// find text box for txtPrice
DropDownList blogtype = (DropDownList)row.FindControl("ddlBlogType");
TextBox description = (TextBox)row.FindControl("txtDescription");
TextBox blogstory = (TextBox)row.FindControl("txtBlogStory");
// Remove $ sign
string strName = name.Text;
string strBlogType = blogtype.SelectedValue;
string strDescription = description.Text;
string strBlogStory = blogstory.Text;
}

I see the issue as the way you populate the DropDownList. The code isn't shown in your post, so assuming you don't have anything to that effect.
So you normally set the desired gridviewrow in edit mode as below:
protected void grdBlog_RowEditing(object sender, GridViewEditEventArgs e)
{
grdBlog.EditIndex = e.NewEditIndex;
bindResultGridView();
}
Now we need to figure when exactly to bind the dropdownlist. Therefore when the particular datarow (which is in edit mode) is getting databound we have a chance to obtain the reference to the corresponding edit row's dropdownlist. Hence for this you can refer this post.
In summary you need to handle the DataBound event of the gridview and determine from its rowstate what mode it is in. Sharing the code sample from linked post below:
protected void gv_RowDataBound(object sender, GridViewEditEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
if ((e.Row.RowState & DataControlRowState.Edit) > 0)
{
DropDownList ddList= (DropDownList)e.Row.FindControl("DStatusEdit");
//bind dropdownlist
DataTable dt = con.GetData("select distinct status from directory");
ddList.DataSource = dt;
ddList.DataTextField = "YourCOLName";
ddList.DataValueField = "YourCOLName";
ddList.DataBind();
DataRowView dr = e.Row.DataItem as DataRowView;
//ddList.SelectedItem.Text = dr["YourCOLName"].ToString();
ddList.SelectedValue = dr["YourCOLName"].ToString();
}
}
}

Can't get value from radio button on gridview on C#

Hello i have a Gridview with 4 radio buttons and i want to get the value from them, and no matter what i do the value is always false, could someone tellme where is my mistake?
This is the code of the gridview:
<asp:GridView ID="GridView8" runat="server" Width="903px"
Height="516px" CellPadding="4" ForeColor="#333333" GridLines="None"
Visible="False"
>
<AlternatingRowStyle BorderColor="Black" BackColor="White" />
<Columns>
<asp:TemplateField HeaderText="Solicitante/">
<ItemTemplate>
<asp:RadioButton ID="optCl1" runat="server" Text="SI" GroupName="optCl" />
<asp:RadioButton ID="optCl2" runat="server" Text="NO" GroupName="optCl" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="CoGarante">
<ItemTemplate >
<asp:RadioButton ID="optGar1" runat="server" Text="SI" GroupName="optGar" />
<asp:RadioButton ID="optGar2" runat="server" Text="NO" GroupName="optGar" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
<EditRowStyle BorderColor="Black" />
<FooterStyle BackColor="#990000" BorderColor="Black" ForeColor="White"
Font-Bold="True" />
<HeaderStyle BackColor="#990000" BorderColor="Black" Font-Bold="True"
ForeColor="White" />
<PagerStyle ForeColor="#333333" HorizontalAlign="Center" BackColor="#FFCC66" />
<RowStyle BackColor="#FFFBD6" ForeColor="#333333" />
<SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
<SortedAscendingCellStyle BackColor="#FDF5AC" />
<SortedAscendingHeaderStyle BackColor="#4D0000" />
<SortedDescendingCellStyle BackColor="#FCF6C0" />
<SortedDescendingHeaderStyle BackColor="#820000" />
</asp:GridView>
The code of the function that read the radiobutton
protected void saveQuestions()
{
foreach (GridViewRow row in GridView8.Rows)
{
RadioButton rb = row.Cells[2].FindControl("optGar2") as RadioButton;
Response.Write(rb.Checked);
}
conn.Close();
}
The code of the function that set the data on the gridview:
protected void loadQuestions()
{
OdbcConnection conn = connection();
conn.Open();
OdbcCommand findSql = new OdbcCommand("SELECT question AS PREGUNTAS,id FROM questionary_reg WHERE(status='1')", conn);
GridView8.DataSource = null;
DataTable dt = new DataTable();
dt.Load(findSql.ExecuteReader());
GridView8.DataSource = dt;
GridView8.DataBind();
conn.Close();
}

The problem because happen postback and reset the values inside the gridview, make sure you
call this function loadQuestions() on if !Postback ONLY
if(!IsPostBack){
loadQuestions();
}
#UPDATE 1 WORKING CODE :
//Design
<asp:GridView runat="server" ID="gv">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:RadioButton runat="server" ID="rd" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:Button runat="server" ID="btn" onclick="btn_Click" />
//Code
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
using (SqlConnection cn = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnStringDb1"].ToString()))
{
try
{
String cmdText = "SELECT * FROM Image WHERE IsDeleted=#isDeleted";
SqlCommand cmd = new SqlCommand(cmdText, cn);
cmd.Parameters.AddWithValue("#IsDeleted", "false");
cn.Open();
SqlDataAdapter myAdapter = new SqlDataAdapter(cmd);
DataTable dt_Category = new DataTable();
myAdapter.Fill(dt_Category);
cn.Close();
gv.DataSource = dt_Category;
gv.DataBind();
}
catch (Exception ex)
{
}
}
}
}
protected void btn_Click(object sender, EventArgs e)
{
foreach (GridViewRow gvr in gv.Rows)
{
RadioButton rd = (RadioButton)gvr.FindControl("rd");
if (rd.Checked)
{
}
else
{
}
}
}

Maybe you need a 'CheckedChanged' event: (Tested and working)
In ASPX set (in this example, you can to see label display the number of row selected)
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:RadioButton ID="rbtnSelect" AutoPostBack="true" runat="server" OnCheckedChanged="rbtnSelect_CheckedChanged" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
and code-behing set
protected void rbtnSelect_CheckedChanged(object sender, EventArgs e)
{
RadioButton selectButton = (RadioButton)sender;
GridViewRow row = (GridViewRow)selectButton.Parent.Parent;
int a = row.RowIndex;
foreach (GridViewRow rw in gvCursos.Rows)
{
if (selectButton.Checked)
{
if (rw.RowIndex != a)
{
lbResultado.Text = rw.RowIndex.ToString();
RadioButton rd = rw.FindControl("rbtnSelect") as RadioButton;
rd.Checked = false;
}
}
}
}

Change this:
RadioButton rb = row.Cells[2].FindControl("optGar2") as RadioButton;
To this:
RadioButton rb = row.FindControl("optGar2") as RadioButton;

for (int i = 0; i < GridView8.Rows.Count; i++)
{
if (GridView8.Rows[i].RowType == DataControlRowType.DataRow)
{
RadioButton rb= (RadioButton)grdView.Rows[i].FindControl("optGar2");
Response.Write(rb.Checked);
}
}

foreach (GridViewRow gvp in gridView1.Rows)
{
System.Web.UI.HtmlControls.HtmlInputRadioButton rd = (System.Web.UI.HtmlControls.HtmlInputRadioButton)gvp.FindControl("rd");
if (rd.Checked)
{
string s = rd.Value;
}
else
{
}
}
design view
<ItemTemplate>
<input runat="server" id='rd' type="radio" value='<%# Eval("id") %>' onclick="javascript:SelectSingleRadiobutton(this.id)" />
</ItemTemplate>

Textbox In gridview not saving its value in table

I have a gridview gv_Products and a gridview Gv_selected. My products gridview has a checkbox that when is checked the selected row is entered in the gv_selected gridview.
I have added a textbox in gv_selected gridiew to enter the quantity i want to reorder. The quantity that i enter loses its value after i press the submit button.
<asp:GridView ID="gvSelected" runat="server"
AutoGenerateColumns = "False" Font-Names = "Arial" CssClass="gridviewsSmall" Font-Size = "11pt"
OnRowDataBound="GridView_gvSelected_RowDataBound" EnableViewState="False"
EmptyDataText = "No Records Selected" >
<Columns>
<asp:BoundField DataField="ProductId" HeaderText="Product ID" ReadOnly="True"
SortExpression="ProductId" />
<asp:TemplateField HeaderText="Product No" SortExpression="ProductNo">
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Bind("ProductNo") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Product Name" SortExpression="Product_name">
<ItemTemplate>
<asp:Label ID="Label3" runat="server" Text='<%# Bind("Product_name") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="SupplierId" HeaderText="Supplier ID" ReadOnly="True"
SortExpression="SupplierId" />
<asp:TemplateField HeaderText="Quantity" SortExpression="Quantity">
<ItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%#Bind("Quantity") %>'></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:Button ID="btnSendOrder" Visible="false" runat="server" Text="Send Order"
onclick="btnSendOrder_Click" />
Here is my code behind for adding rows in gvSelected gridview
private DataTable CreateDataTable()
{
DataTable dt = new DataTable();
dt.Columns.Add("ProductId");
dt.Columns.Add("ProductNo");
dt.Columns.Add("Product_name");
dt.Columns.Add("SupplierId");
dt.Columns.Add("Quantity");
dt.AcceptChanges();
return dt;
}
private DataTable AddRow(GridViewRow gvRow, DataTable dt)
{
DataRow[] dr = dt.Select("ProductId = '" + gvRow.Cells[3].Text + "'");
if (dr.Length <= 0)
{
dt.Rows.Add();
dt.Rows[dt.Rows.Count - 1]["ProductId"] = gvRow.Cells[3].Text;
dt.Rows[dt.Rows.Count - 1]["ProductNo"] = (gvRow.FindControl("Label2") as Label).Text;
dt.Rows[dt.Rows.Count - 1]["Product_name"] = (gvRow.FindControl("Label3") as Label).Text;
dt.Rows[dt.Rows.Count - 1]["SupplierId"] = (gvRow.FindControl("Label5") as Label).Text;
dt.Rows[dt.Rows.Count - 1]["Quantity"] = 0;
dt.AcceptChanges();
}
return dt;
}
protected void CheckBox_CheckChanged(object sender, EventArgs e)
{
GetData();
SetData();
BindSecondaryGrid();
}
private void BindSecondaryGrid()
{
DataTable dt = (DataTable)ViewState["SelectedRecords"];
gvSelected.DataSource = dt;
gvSelected.DataBind();
}
And here is the submit button!
protected void btnSendOrder_Click(object sender, EventArgs e)
{
t_supplier_orders newOrder = new t_supplier_orders();
newOrder.UserName = User.Identity.Name;
newOrder.Order_date = DateTime.Now;
newOrder.Order_status = "Pending";
MembershipUser myObject = Membership.GetUser();
Guid UserID = new Guid(myObject.ProviderUserKey.ToString());
newOrder.UserId = UserID;
newOrder.SupplierId = Convert.ToInt32(ddl1.SelectedValue);
newOrder.Received_date = null;
Bohemian.t_supplier_orders.AddObject(newOrder);
Bohemian.SaveChanges();
//------------------------------------------------------------------------+
// Create a new OderDetail Record for each item in the gvSelected |
//------------------------------------------------------------------------+
foreach (GridViewRow row in gvSelected.Rows)
{
{
t_supplier_orders_details od = new t_supplier_orders_details();
TextBox txt1 = (TextBox)gvSelected.FindControl("TextBox1");
od.OrderId = newOrder.OrderId;
od.ProductId = Convert.ToInt32(row.Cells[0].Text);
od.Product_name = (row.FindControl("Label3") as Label).Text;
od.ProductNo = (row.FindControl("Label2") as Label).Text;
od.Quantity = Convert.ToInt32(txt1.text);
Bohemian.t_supplier_orders_details.AddObject(od);
}
}
Bohemian.SaveChanges();
lblSuccess.Text = "The Order has been successfully sent to supplier!!";
lblSuccess.ForeColor=System.Drawing.Color.BlueViolet;
lblSuccess.Font.Bold = true;
}

I assume that you are assigning the DataSource and DataBind the GridView on every postback. That will overwite all changes.
So wrap your code in a !IsPostBack check:
protected void Page_Load()
{
if(!IsPostBack)
{
BindSecondaryGrid();
}
}
By the way, you should not store the DataTable in ViewState since that will blow it up.

edit row in gridview

I would like to help me with my code. I have 2 gridviews. In the first gridview the user can choose with a checkbox every row he wants. These rows are transfered in the second gridview. All these my code does them well.Now, I want to edit the quantity column in second gridview to change the value but i don't know what i must write in edit box.
Here is my code:
using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections;
public partial class ShowLand : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindPrimaryGrid();
BindSecondaryGrid();
}
}
private void BindPrimaryGrid()
{
string constr = ConfigurationManager.ConnectionStrings["conString"].ConnectionString;
string query = "select * from Land";
SqlConnection con = new SqlConnection(constr);
SqlDataAdapter sda = new SqlDataAdapter(query, con);
DataTable dt = new DataTable();
sda.Fill(dt);
gridview2.DataSource = dt;
gridview2.DataBind();
}
private void GetData()
{
DataTable dt;
if (ViewState["SelectedRecords1"] != null)
dt = (DataTable)ViewState["SelectedRecords1"];
else
dt = CreateDataTable();
CheckBox chkAll = (CheckBox)gridview2.HeaderRow
.Cells[0].FindControl("chkAll");
for (int i = 0; i < gridview2.Rows.Count; i++)
{
if (chkAll.Checked)
{
dt = AddRow(gridview2.Rows[i], dt);
}
else
{
CheckBox chk = (CheckBox)gridview2.Rows[i]
.Cells[0].FindControl("chk");
if (chk.Checked)
{
dt = AddRow(gridview2.Rows[i], dt);
}
else
{
dt = RemoveRow(gridview2.Rows[i], dt);
}
}
}
ViewState["SelectedRecords1"] = dt;
}
private void SetData()
{
CheckBox chkAll = (CheckBox)gridview2.HeaderRow.Cells[0].FindControl("chkAll");
chkAll.Checked = true;
if (ViewState["SelectedRecords1"] != null)
{
DataTable dt = (DataTable)ViewState["SelectedRecords1"];
for (int i = 0; i < gridview2.Rows.Count; i++)
{
CheckBox chk = (CheckBox)gridview2.Rows[i].Cells[0].FindControl("chk");
if (chk != null)
{
DataRow[] dr = dt.Select("id = '" + gridview2.Rows[i].Cells[1].Text + "'");
chk.Checked = dr.Length > 0;
if (!chk.Checked)
{
chkAll.Checked = false;
}
}
}
}
}
private DataTable CreateDataTable()
{
DataTable dt = new DataTable();
dt.Columns.Add("id");
dt.Columns.Add("name");
dt.Columns.Add("price");
dt.Columns.Add("quantity");
dt.Columns.Add("total");
dt.AcceptChanges();
return dt;
}
private DataTable AddRow(GridViewRow gvRow, DataTable dt)
{
DataRow[] dr = dt.Select("id = '" + gvRow.Cells[1].Text + "'");
if (dr.Length <= 0)
{
dt.Rows.Add();
dt.Rows[dt.Rows.Count - 1]["id"] = gvRow.Cells[1].Text;
dt.Rows[dt.Rows.Count - 1]["name"] = gvRow.Cells[2].Text;
dt.Rows[dt.Rows.Count - 1]["price"] = gvRow.Cells[3].Text;
dt.Rows[dt.Rows.Count - 1]["quantity"] = gvRow.Cells[4].Text;
dt.Rows[dt.Rows.Count - 1]["total"] = gvRow.Cells[5].Text;
dt.AcceptChanges();
}
return dt;
}
private DataTable RemoveRow(GridViewRow gvRow, DataTable dt)
{
DataRow[] dr = dt.Select("id = '" + gvRow.Cells[1].Text + "'");
if (dr.Length > 0)
{
dt.Rows.Remove(dr[0]);
dt.AcceptChanges();
}
return dt;
}
protected void CheckBox_CheckChanged(object sender, EventArgs e)
{
GetData();
SetData();
BindSecondaryGrid();
}
private void BindSecondaryGrid()
{
DataTable dt = (DataTable)ViewState["SelectedRecords1"];
gridview3.DataSource = dt;
gridview3.DataBind();
}
}
and the source code is
<asp:GridView ID="gridview2" runat="server" AutoGenerateColumns="False"
DataKeyNames="id" DataSourceID="SqlDataSource5">
<Columns>
<asp:TemplateField>
<HeaderTemplate>
<asp:CheckBox ID="chkAll" runat="server" onclick = "checkAll(this);"
AutoPostBack = "true" OnCheckedChanged = "CheckBox_CheckChanged"/>
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="chk" runat="server" onclick = "Check_Click(this)"
AutoPostBack = "true" OnCheckedChanged = "CheckBox_CheckChanged" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="id" HeaderText="id" InsertVisible="False"
ReadOnly="True" SortExpression="id" />
<asp:BoundField DataField="name" HeaderText="name"
SortExpression="name" />
<asp:BoundField DataField="price" HeaderText="price" SortExpression="price" />
<asp:BoundField DataField="quantity" HeaderText="quantity"
SortExpression="quantity" />
<asp:BoundField DataField="total" HeaderText="total" SortExpression="total" />
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource5" runat="server"
ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
SelectCommand="SELECT * FROM [Land]"></asp:SqlDataSource>
<br />
</div>
<div>
<asp:GridView ID="gridview3" runat="server"
AutoGenerateColumns = "False" DataKeyNames="id"
EmptyDataText = "No Records Selected" >
<Columns>
<asp:BoundField DataField = "id" HeaderText = "id" />
<asp:BoundField DataField = "name" HeaderText = "name" ReadOnly="True" />
<asp:BoundField DataField = "price" HeaderText = "price"
DataFormatString="{0:c}" ReadOnly="True" />
<asp:TemplateField HeaderText="quantity">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("quantity")%>'</asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("quantity") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField = "total" HeaderText = "total"
DataFormatString="{0:c}" ReadOnly="True" />
<asp:CommandField ShowEditButton="True" />
</Columns>
</asp:GridView>
<asp:Label ID="totalLabel" runat="server"></asp:Label>
<br />
</div>
</form>
</body>
</html>

This is not particular asp.net solution but that's how I do something like this in my Windows app.
First of all you shoul make shure that there's a selected row in your GridView (gridView.SelectedRow != null). DataTable object allows you to get access to desired row by accessing it not by numeric index but by DataRow-type object index. After getting a reference to the row which fields' value you want to modify just go ahead with changes.
Here's the example:
if (gridView.SelectedRow != null)
{
dataTable.Rows[gridView.SelectedRow].BeginEdit();
dataTable.Rows[gridView.SelectedRow]["yourFieldName"] = newValue;
dataTable.Rows[gridView.SelectedRow].EndEdit();
gridView.DataSource = dataTable;
}
Hope my answer is of any help because I've never dealt with asp.net before.

how to sort in gridview using template fields

The sorting works fine when u fill the gridview using SQL datasource in the aspx page...
but now i am using template field and the columns are filled separately in the codebehind and the sorting is not working...
my code is
<asp:GridView ID="GridView1" runat="server" AllowSorting="True"
AutoGenerateColumns="False"
ondatabound="GridView1_DataBound"
onrowdatabound="GridView1_RowDataBound">
<Columns>
<asp:TemplateField HeaderText="File Name" ItemStyle-Width="40%" >
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server"></asp:Label>
</ItemTemplate>
<HeaderStyle HorizontalAlign="Center" VerticalAlign="Middle" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Failure Count" ItemStyle-Width="10%" >
<EditItemTemplate>
<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label3" runat="server"></asp:Label>
</ItemTemplate>
<HeaderStyle HorizontalAlign="Center" VerticalAlign="Middle" />
<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" />
</asp:TemplateField>
</Columns></GridView>
and my codebehind is:
DataTable dt = new DataTable();
SqlConnection connection = new SqlConnection();
connection.ConnectionString = ConfigurationManager.ConnectionStrings["SumooHAgentDBConnectionString"].ConnectionString;
connection.Open();
SqlCommand sqlCmd = new SqlCommand("SELECT FileName,FailureCount from Files where MachineID=#strID , connection);
SqlDataAdapter sqlDa = new SqlDataAdapter(sqlCmd);
sqlCmd.Parameters.AddWithValue("strID", strID);
sqlDa.Fill(dt);
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
string nameoffiles = dt.Rows[i]["FileName"].ToString();
buFailureCode.Add(code);
string count = dt.Rows[i]["BuFailureCount"].ToString();
buFailureCount.Add(count);
}
}
connection.Close();
}
protected void GridView1_DataBound(object sender, EventArgs e)
{
if (namesOfFiles.Count != 0)
{
for (int i = 0; i < namesOfFiles.Count; i++)
{
GridViewRow myRow = GridView1.Rows[i];
Label Label1 = (Label)myRow.FindControl("Label1");
Label Label3 = (Label)myRow.FindControl("Label3");
Label1.Text = namesOfFiles[i].ToString();
Label3.Text = buFailureCount[i].ToString();
}}}

set SortExpression

I think you'll have to handle the OnSorting event and do the actual sorting yourself in code-behind. The API documentation has an example.