cannot delete row from gridview

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
    if (e.CommandName.Equals("Delete"))
    {
       int index = Convert.ToInt32(e.CommandArgument);
       var id = ((Label)GridView1.Rows[index].Cells[0].FindControl("id")).Text.Trim();

       SqlConnection con = new SqlConnection(connstring);
       string qry = "Delete from ['ISB VAS Nodes$'] where ID = " + id + "";
       SqlCommand com = new SqlCommand(qry, con);

       if (com.ExecuteNonQuery() == 1)
       {
           Label2.Text = "Deleted";
           binddata();
        }
        else
        {
           Label2.Text = "Not Deleted";
        }
     }
}