I have the following page:
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Default.aspx.vb" Inherits="WebApplication1._Default" %><%@ Register Assembly="Infragistics2.WebUI.UltraWebGrid.v7.2, Version=7.2.20072.1063, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb" Namespace="Infragistics.WebUI.UltraWebGrid" TagPrefix="igtbl" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>Untitled Page</title></head><body> <form id="form1" runat="server"> <div> <igtbl:UltraWebGrid ID="UltraWebGrid1" runat="server"> <Bands> <igtbl:UltraGridBand> <Columns> <igtbl:UltraGridColumn IsBound="true" BaseColumnName="x"> <Header Caption="Test" /> </igtbl:UltraGridColumn> </Columns> </igtbl:UltraGridBand> </Bands> <DisplayLayout AutoGenerateColumns="false" /> </igtbl:UltraWebGrid> </div> </form></body></html>
and the following code behind:
Partial Public Class _Default Inherits System.Web.UI.Page Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not Me.IsPostBack Then Dim odtData As New DataTable() odtData.Columns.Add("x", GetType(Integer)) odtData.Rows.Add(0) Me.UltraWebGrid1.DataSource = odtData Me.UltraWebGrid1.DataBind() End If End SubEnd Class
and when I run this I get "No Data to Display". However, when i use a SqlDataSource and add the "DataSourceID" property to the UltraWebGrid tag instead of binding the data in the code behind, it works. If I replace the UltraWebGrid with the basic ASP.NET DataGrid, it works.
Thanks for posting this solution, i also had a similar issue and this helped me resolve my problem.
bkimmelca said:There is no <Columns> tag outside the <Bands> tag.. unless you are referring to the other control
My bad. Sorry.
There is no <Columns> tag outside the <Bands> tag.. unless you are referring to the other control, which is an ASP.NET DataGrid control, which doesn't have a <Bands> tag. But your example above had an actual table name ("Suppliers"). That was the main difference I saw between your example and what I had done -- and it makes sense that you would have to map the table to a band somehow, since you can have multiple bands displaying data from multiple tables, whereas the ASP.NET datagrid, in effect, has only one "band", so no mapping is necessary.
I'm still just shooting from the hip, here, but I've never seen a <columns> tag outside a <bands> tag. I don't see anything wrong with your <UltraGridColumn> tag, except that features like column sorting won't work unless it also has a Key="x" property.
HTH
The issue is not how I set up the data. The actual data I am using in the application I am writing is coming from a SQL Server database. I just created a minimal example that demonstrates the issue. Also, like I said, the exact same code behind works If I use an ASP.NET datagrid -- so the issue is with the WebGrid control, not with the DataTable. However, I have tried using DataTable.NewRow() -- it still does not work. Here is the ASPX markup:
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Default.aspx.vb" Inherits="WebApplication1._Default" %><%@ Register Assembly="Infragistics2.WebUI.UltraWebGrid.v7.2, Version=7.2.20072.1063, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb" Namespace="Infragistics.WebUI.UltraWebGrid" TagPrefix="igtbl" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>Untitled Page</title></head><body> <form id="form1" runat="server"> <div> <asp:DataGrid ID="dgTestGrid" runat="server" AutoGenerateColumns="false"> <Columns> <asp:BoundColumn DataField="x" HeaderText="Test" /> </Columns> </asp:DataGrid> <igtbl:UltraWebGrid ID="UltraWebGrid1" runat="server"> <Bands> <igtbl:UltraGridBand> <Columns> <igtbl:UltraGridColumn IsBound="true" BaseColumnName="x"> <Header Caption="Test" /> </igtbl:UltraGridColumn> </Columns> </igtbl:UltraGridBand> </Bands> <DisplayLayout AutoGenerateColumns="false" /> </igtbl:UltraWebGrid> </div> </form></body></html>
And here is the code behind:
Partial Public Class _Default Inherits System.Web.UI.Page Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not Me.IsPostBack Then Dim odtData As New DataTable() Dim odrRow As DataRow odtData.Columns.Add("x", GetType(Integer)) odrRow = odtData.NewRow() odrRow("x") = 0 odtData.Rows.Add(odrRow) Me.UltraWebGrid1.DataSource = odtData Me.UltraWebGrid1.DataBind() Me.dgTestGrid.DataSource = odtData Me.dgTestGrid.DataBind() End If End SubEnd Class
The ASP.NET datagrid displays a single column with a caption of "Test" and a single row containing "0". The UltraWebGrid displays "No Data To Display".
I did figure out what the problem is, however. In order for the binding to work, the "BaseTableName" property has to be set in the <igtbl:UltraGridBand> tag, and the "TableName" property has to be set on the DataTable. If the TableName property is blank (""), there is no way to do the binding (even setting BaseTableName="" will not cause it to a DataTable with a TableName of "").