i have UltraWebGrid Ver(8.1.20081.1000). Code Behind vb.net

I created the columns in server side including one check box column.

If select check box column i can able to get the check box column value in client side,

But i can't able to get the check box column value in in server side.

'*** Client Side i am using this Code

function grdLvAprRej_AfterCellUpdateHandler(gridName, cellId)

{

    var myGrid = igtbl_getGridById(gridName);

    var cell = igtbl_getCellById(cellId);

    var check = cell.getValue();

   alert(check);

}

'*** 

'*** Server Side i am using this code

for i = 0 to myGrid.rows.count

    check = myGrid.Rows(0).Cells.FromKey("SelectC").Value

   msgbox (check)

next

'***

How can i get the check box column value in server side.

Please help me to do this.