GridView 无数据时，绑定提示

  private void BindData()
     {
         DataTable dt = DAO.RunSQLReturnDt(this.getsql());
         int dtcount = dt.Rows.Count;
         if (dtcount == )
         {
             dt.Rows.Add(dt.NewRow());
         }
         DataView dv = dt.DefaultView;
         //对用于分页的类的引用
         PagedDataSource pds = new PagedDataSource();
         pds.DataSource = dv;//设置数据源(DataTable类型)
         pds.AllowPaging = true;
         //每页显示的行数
         pds.PageSize = ;
         AspNetPager1.RecordCount = dv.Count;
         pds.CurrentPageIndex = AspNetPager1.CurrentPageIndex - ;
         pds.PageSize = AspNetPager1.PageSize;
         GridView1.DataSource = pds;
         GridView1.DataBind();
         if (dtcount <= )
         {
             int colnumcount = dt.Columns.Count;
             GridView1.Rows[].Cells.Clear();
             GridView1.Rows[].Cells.Add(new TableCell());
             GridView1.Rows[].Cells[].ColumnSpan = colnumcount;
             GridView1.Rows[].Cells[].Text = "没有相关记录";
             GridView1.Rows[].Cells[].Style.Add("color", "red");
         }

     }

页面正常显示

 <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CssClass="tablelist" GridLines="None" DataKeyNames="C_ID" OnRowDataBound="GridView1_RowDataBound">
                     <Columns>
                         <asp:BoundField DataField="C_AppNum" HeaderText="入库编号" SortExpression="C_AppNum">
                             <ItemStyle HorizontalAlign="Center" />
                         </asp:BoundField>

                         <asp:BoundField DataField="C_AppDate" HeaderText="申请时间" SortExpression="C_AppDate">
                             <ItemStyle HorizontalAlign="Center" />
                         </asp:BoundField>
                         <asp:TemplateField HeaderText="申请部门">
                             <ItemTemplate>
                           <%# XC.Depart.GetDepartName(Eval("C_AppDepartID").ToString()) %>
                             </ItemTemplate>
                             <ItemStyle HorizontalAlign="Center" />
                         </asp:TemplateField>
                         <asp:TemplateField HeaderText="申请人">
                             <ItemTemplate>
                                 <%# XC.User.GetUserName(Eval("C_AppUserID").ToString())%>
                             </ItemTemplate>
                             <ItemStyle HorizontalAlign="Center" />
                         </asp:TemplateField>
                         <asp:BoundField DataField="C_Status" HeaderText="状态" SortExpression="C_Status">
                             <ItemStyle HorizontalAlign="Center" />
                         </asp:BoundField>
                         <asp:BoundField DataField="C_AuditState" HeaderText="审核状态" SortExpression="C_AuditState">
                             <ItemStyle HorizontalAlign="Center" />
                         </asp:BoundField>

                     </Columns>
                     <HeaderStyle HorizontalAlign="center" />
                 </asp:GridView>

效果