CheckBox not Working from inside a Repeater in ASP.NET Webforms

Question

This is what I wrote inside the Repeater

<td style="text-align: center; width: 60px">
   <asp:CheckBox ID="DeleteCheckBox" runat="server" CommandArgument='<%# Eval("Id")%>' AutoPostBack="True" OnCheckedChanged="DeleteCheckBox_Click" />
td>

and this is the C#

protected void DeleteLinkbtn_Click(object sender, EventArgs e)
    {
        try
        {
            LinkButton BtnId = (LinkButton)(sender);
            string ButtonId = BtnId.CommandArgument;
            long Active = 1;
            if (ButtonId !=string.Empty) 
            {
                if (DeleteCheckBox.Checked==true)
                {
                    objdalTransactionEntry.RentSettingsIsActiveUpdate(Convert.ToInt64(ButtonId), Active);
                }
                
            }
        }
        catch (Exception) { }
    }

The Problem is that it is not being able to find the ID of the checkbox DeleteCheckBox in C# code

Answer 1

Based on you code, I have the following comments:

1. Change you function name, it's confusing. It should either be DeleteCheckBox_Changed or it should not be used for the OnCheckedChanged event

2. Your sender is not a LinkButton it is the checkbox itself. So you can access the checkbox control with CheckBox checkBoxThatChanged = (CheckBox)(sender)

3. DeleteCheckBox does not really exist. You have multiple DeleteCheckBox s due to your repeater, so you won't be able to access it this way.

4. If you are indeed using a LinkButton , and you want to find a checkbox, then you should add a value to the link button, indicating the row of the table it refers to and iterate through all the checkbox controls until you find your target one.