Hi,

To change the visibility of any button or any control based on some
condition in grid, you can create 1 function after binding the grid.
Say,

.
grdcustomers.databind();
CheckGridForVisibility();

add this function to your page..

public void CheckGridForVisibility()
{
 for (int i = 0; i < grdCustomers.Rows.Count; i++)
       {
           Label lbldatetime =
(Label)grdCustomers.Rows[i].FindControl("lblDataTime");
       if (lbldatetime.Text == DateTime.Today.ToString())
           {
               Button btnedit =
grdCustomers.Rows[i].FindControl("btnEdit");
               btnedit.Visible = false;
           }
       }
}

Hope this will help you..

Regards,
Mansi Shah.