Grid view button Issue

BLLSuggestion_Mast ObjApp = new BLLSuggestion_Mast();
            if (e.CommandName == "Display")
                ObjApp.UpdateTopic(Convert.ToInt16(e.CommandArgument), Session["FLG"].ToString());
            else if (e.CommandName == "Hide")
                ObjApp.UpdateTopic(Convert.ToInt16(e.CommandArgument), Session["FLG"].ToString());
            else if (e.CommandName == "Deny")
                ObjApp.UpdateTopic(Convert.ToInt16(e.CommandArgument), Session["FLG"].ToString());
            BindTopics();

  if (e.Row.RowType == DataControlRowType.DataRow)
            {

                Button objDisplay = (Button)e.Row.FindControl("btnApprove");
                Button objHide = (Button)e.Row.FindControl("btnHide");
                Button objCancel = (Button)e.Row.FindControl("btnCancel");
                if (dgTopics.DataKeys[e.Row.RowIndex].Values[1].ToString() == "A")
                {
                    objDisplay.Visible = false;
                    objHide.Visible = true;
                    objCancel.Visible = true;
                }
                else if (dgTopics.DataKeys[e.Row.RowIndex].Values[1].ToString() == "H")
                {
                    objDisplay.Visible = true;
                    objHide.Visible = false;
                    objCancel.Visible = true;
                }
                else if (dgTopics.DataKeys[e.Row.RowIndex].Values[1].ToString() == "C")
                {
                    objDisplay.Visible = true;
                    objHide.Visible = false;
                    objCancel.Visible = false;
                }
            }
        }