protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
if(Request.QueryString["name"] == "all")
e.Row.Cells[<index_of_cell>].Visible = true;
else
e.Row.Cells[<index_of_cell>].Visible = false;
}
}