CheckBox in GridView firing CheckedChanged event at wrong time - asp.net

Question

I have a checkbox in my gridview footer with autopostack=true (which should fire a checkedchanged event), and a linkbutton in my itemtemplate (which should fire the gridview rowcommand event).
Everything has been working fine, until I placed the following code in my gridview rowdatabound (or databound) event:
for (int i = 0; i < gridCartRows.Columns.Count - 2; i++)
{
e.Row.Cells.RemoveAt(0);
}
e.Row.Cells[0].ColumnSpan = gridCartRows.Columns.Count - 1;
Now, when I click my linkbutton, the checkbox checkedchanged event is automatically fired, and then the rowcommand event is fired.
Why is the checkedchanged event being fired when it shouldn't, when I add the above code?
Is there a way to get around this?
Edit
Here's a sample, that reproduces my issue:
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" ShowFooter="True"
OnRowCommand="GridView1_RowCommand" OnRowDataBound="GridView1_RowDataBound">
<Columns>
<asp:TemplateField HeaderText="Column1">
<ItemTemplate>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Column2">
<ItemTemplate>
<asp:LinkButton ID="LinkButton1" runat="server" Text="Fire Row Command" CommandName="Fire" />
</ItemTemplate>
<FooterTemplate>
Footer
<asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="true" OnCheckedChanged="CheckBox1_CheckedChanged" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Column3">
<ItemTemplate>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Code-behind:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
GridView1.DataSource = new int[5];
GridView1.DataBind();
}
}
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Footer)
{
for (int i = 0; i < GridView1.Columns.Count - 2; i++)
{
e.Row.Cells.RemoveAt(0);
}
e.Row.Cells[0].ColumnSpan = GridView1.Columns.Count - 1;
((CheckBox)e.Row.FindControl("CheckBox1")).Checked = true;
}
}
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "Fire")
{
Response.Write("RowCommand fired.");
}
}
protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
{
Response.Write("CheckBox fired.");
}
Note, I'm setting the CheckBox property to true in the RowDataBound - if I remove this, it works fine. So merging the cells and setting the checkbox property aren't working nicely together.

Answer 1

GridView Control events are stored in viewstate and they can get messed up very easily. Here removing a cell causing to bind different event to link button. Although after postback __EVENTTARGET is LinkButton, wrong method is called and wrong control, event arguments are passed.
I would suggest to hide the cell rather than removing it:
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Footer)
{
e.Row.Cells[1].ColumnSpan = GridView1.Columns.Count - 1;
e.Row.Cells[0].Visible = false;
((CheckBox)e.Row.FindControl("CheckBox1")).Checked = true;
}
}
This will serve the purpose.