I have a gridview that has an imagebutton column and a check box column.During GridView1_RowDataBound event i disable the checkbox column.Later when i click the image button i display a PDF document in a seperate window using a method named "exportgridview" and try to enable the corresponding checkbox.The problem is when i click the imagebutton the PDF is shown but the checkbox which is in the same row as the clicked imagebutton doesn't get enabled.I will show u the code in the imagebutton click event. protected void ImgBtnPDF_Click(object sender, ImageClickEventArgs e) { ImageButton ib = (ImageButton) sender; TableCell tablecell = (TableCell)ib.Parent; GridViewRow row = (GridViewRow)tablecell.Parent; CheckBox CBox = (CheckBox) row.FindControl("CheckBox2"); CBox.Enabled = true; Session["FamilyKey"] = row.Cells[1].Text; Session["StudentKey"] = row.Cells[2].Text; ExportGridView(); // this method shows the PDF in a seperate window }