ASP.NET

foreach (GridViewRow row in GridView1.Rows)
           {
               string upstr = "UPDATE emp SET flag = '1' WHERE empId = ";
               CheckBox ch = (CheckBox)(row.FindControl("chkbx1"));

               if (ch.Checked == true)
               {
                   int Id = Convert.ToInt32(GridView1.DataKeys[row.RowIndex].Value);
                   idArr.Add(Id);

                   upstr += "'" + Id + "'";
                   conn = new SqlConnection(constr);
                   conn.Open();
                   SqlCommand comm = new SqlCommand(upstr, conn);
                   comm.ExecuteNonQuery();
                   conn.Close();

                   GridView1.DeleteRow(Id);

                   //row.Visible = false;
                   ch.Checked = false;
               }
           }