Getting error on selecting multiple rows for deleting in gridview..?

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I want to select multiple rows using checkbox in gridview.. And i want to delete those rows. I wrote the code for deleting. But Checked value is not getting, hence it generates the error...

my code is-
In .cs page

C#

foreach (GridViewRow row in GrdATContactList.Rows)
        {
            CheckBox cb = (CheckBox)row.FindControl("ChkBoxATContact") as CheckBox;
            if (((CheckBox)row.FindControl("ChkBoxATContact")).Checked)
            {
                string id = GrdATContactList.DataKeys[row.RowIndex].Value.ToString();
               
            }
        }

In .aspx page

XML

<columns>
     <templatefield>
        <itemtemplate>
            <asp:CheckBox ID="ChkBoxATContact"" runat="server" /> 
        </itemtemplate>
      
</templatefield></columns>

Although I select rows, but i get checked = false...

Posted 18-Feb-13 1:29am

mona_12

Updated 18-Feb-13 1:55am

ZurdoDev

v2

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Comments

Asim Mahmood 18-Feb-13 7:54am

If you checkbox is unchecked then you must check your code may be while clicking Delete button your grid is binding again.

ZurdoDev 18-Feb-13 7:55am

Where's the code that checks the boxes?

Sandeep Mewara 18-Feb-13 8:09am

1. What error?
2. Where is code for deleting?

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S. M. Ahasan Habib · Accepted Answer · 2013-02-18T05:46:00

When you bind the grid you should bind it conditionally. Condition would be if (!page.IsPostBack) then you bind grid. In your case when form post back to the server it is rebind and your checkbox selection is override. Just code example like that

ASP.NET

<asp:gridview id="GrdATContactList" runat="server" autogeneratecolumns="false" datakeynames="Id" xmlns:asp="#unknown">
    <columns>
        <asp:templatefield headertext="Is Delete">
            <itemtemplate>
                <asp:checkbox id="chkDelete" runat="server" />
            </itemtemplate>
            <edititemtemplate>
                <asp:textbox id="TextBox1" runat="server" text="Hello"></asp:textbox>
            </edititemtemplate>
        </asp:templatefield>
        <asp:boundfield datafield="Id" />
        <asp:boundfield datafield="Name" />
    </columns>
</asp:gridview>

code bebind as follows

C#

protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            GrdATContactList.DataSource = GetData();
            GrdATContactList.DataBind();
        }
    }
    private IList<Data> GetData()
    {
        var list = new List<Data>();
        list.Add(new Data {Id=1, Name="A1"});
        list.Add(new Data { Id = 2, Name = "A2" });
        list.Add(new Data { Id = 3, Name = "A3" });
        return list;
    }
    protected void OnDeleteAll(object sender, EventArgs e)
    {
        foreach (GridViewRow row in GrdATContactList.Rows)
        {
            CheckBox cb = (CheckBox)row.FindControl("chkDelete") as CheckBox;
            if (((CheckBox)row.FindControl("chkDelete")).Checked)
            {
                string id = GrdATContactList.DataKeys[row.RowIndex].Value.ToString();

            }
        }
    }
}
public class Data
{
    public int Id { get; set; }
    public string Name { get; set; }
}