how find the control place in the grid at runtime from code bind

Hello Everyone,

I am placing a Check box for all cells in grid at run time in row bound event of grid as below:
CheckBox chk = new CheckBox();                              chk.ID = "chk";                              chk.Checked = true;                              e.Row.Cells[i].Controls.Add(chk);

and when I am trying to find the control after performing action, then control in not finding. I am using following code:

if (i < 9) { ControlName = "ctl00_ContentPlaceHolder1_GridVie ...