how to delete the records in gridview

protected void GridView1_RowDeleting1(object sender, GridViewDeleteEventArgs e)
{
int ID = Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Values["id"].ToString());


SqlCommand cmd2 = new SqlCommand("delete from tab where id=" +ID, con);
cmd2.ExecuteNonQuery();
connect();
}



it is not workin



protected void GridView1_RowDeleting1(object sender, GridViewDeleteEventArgs e)
{
int ID = Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Values["id"].ToString());


SqlCommand cmd2 = new SqlCommand("delete from tab where id=" +ID, con);
cmd2.ExecuteNonQuery();
connect();
}