Hide gridview columns

  void gridview1_RowDataBound(Object sender, GridViewRowEventArgs e)
  {
    if(e.Row.RowType == DataControlRowType.DataRow)
    {
      // make cell empty for specific rows.
      if(e.Row.RowIndex == 2)
      {
          e.Row.Cells[1].Text = "";
          e.Row.Cells[2].Text = "";
          e.Row.Cells[3].Text = "";
      }
      else if(e.Row.RowIndex == 3)
      {
          e.Row.Cells[4].Text = "";
          e.Row.Cells[5].Text = "";
      }
     
    }
  }

protected void GV_OnROwDataBound(object sender,GridviewRowEventArgs e)
{
    if(e.Row.RowType==DAtaControlRowType.DAtaRow)
    {
         string val=((Lable)e.Row.FindControl("lblval")).TExt;
         if(val== string.Empty || val=="")
         {
            ((Lable)e.Row.FindControl("lblval")).Enabled=false;
         }
 
    }
}

        GridView2.Columns[0].Visible = false;//change the index based on the column you wanted to hide.
        GridView2.Columns[1].Visible = false;