bool isChecked = ((CheckBox)Gridview1.Rows[e.RowIndex].Cells[e.RowIndex].Controls[0]).Checked;
if (isChecked)
{ chk = 1; }
else
{ chk = 0; }
cmd.Parameters.Add("@check", SqlDbType.Int).Value = chk;
in the above code if i unslect the check box i get ischecked value=false
& chk value=0 but on updating in sql tbl the value does not chnage