Unable to cast error occured

Hello,

I've tried this below coding for delete link button on Gridview control for DataRowBound

butn unfortunately i got an exception of unable to cast

Please Suggest

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)

{

if (e.Row.RowType == DataControlRowType.DataRow && e.Row.RowIndex != GridView1.EditIndex)

{

var deleteButton = (LinkButton)e.Row.Cells[0].Controls[2];

if (deleteButton.Text == "Delete")

{

deleteButton.OnClientClick = "return confirm('Do you really want to delete?');";

}