อยากให้ DataGridView กรอกได้เฉพาะแต่ตัวเลข ผมใส่ Code ใน Keypress แล้วแต่ว่าไม่ได้ !

            dgv1.EditingControlShowing 
            += new 
            DataGridViewEditingControlShowingEventHandler
            ( dgv1_EditingControlShowing );

        void dgv1_EditingControlShowing ( object sender , DataGridViewEditingControlShowingEventArgs e )
        {
            if ( e.Control != null )
            {
                e.Control.KeyPress -= new KeyPressEventHandler( Control_KeyPress );
                e.Control.KeyPress += new KeyPressEventHandler( Control_KeyPress );
            }
        }

        void Control_KeyPress ( object sender , KeyPressEventArgs e )
        {
            e.Handled = !( char.IsDigit( e.KeyChar ) || char.IsControl( e.KeyChar ) );
        }

        void dgv1_EditingControlShowing 
        (   object sender , 
            DataGridViewEditingControlShowingEventArgs e )
        {
            if( e.Control == null || dgv1.SelectedCells.Count == 0 )return;
            e.Control.KeyPress 
                -= new KeyPressEventHandler( Control_KeyPress );
            switch( dgv1.SelectedCells[ 0 ].ColumnIndex )
            {
                //สมมุตให้ column ที่ 0 กับ 1 กรอกใด้เฉพาะตัวเลข
                case 0:case 1:
                    e.Control.KeyPress 
                        += new KeyPressEventHandler( Control_KeyPress );
                    break;
            }
        }