ADO: Yet another nested repeater newbie

• woppie / 102 / Fri, 27 Mar 2009 21:50:00 GMT / Comments (1)
• I know that there is unlimited of forum-treads about solutions to nested repeater problems.
  Still, I just can't get it to work.

  I really hope that someone could guide me to the right solution for creating a nested repeater once and for all

  Error:

  "Object reference not set to an instance of an object."

  Source Error:
  "Line 14: Dim cmd2 As Data.SqlClient.SqlDataAdapter = New Data.SqlClient.SqlDataAdapter("SELECT * from tblRegions", cnn)
  Line 15: cmd2.Fill(ds, "ID")
  Line 16: ds.Relations.Add("myrelation", _
  Line 17: ds.Tables("Links").Columns("ParentCategory"), _
  Line 18: ds.Tables("tblRegions").Columns("ID"))"

  My code:

  test.aspx

  <%... Page Language="VB" AutoEventWireup="false" MasterPageFile="~/MasterPage.master" CodeFile="test.aspx.vb" Inherits="test" %
  <asp:Content ID="ContentTest" ContentPlaceHolderID="ContentMain" Runat="Server"
  <asp:Repeater ID="parentRepeater" runat="server">
  <ItemTemplate>
  <b>
  <%#DataBinder.Eval(Container.DataItem, "ID")%>
  </b>
  <br>
  <asp:Repeater ID="childRepeater" runat="server" DataSource='<%# Container.DataItem.Row.GetChildRows("myrelation") %>'>
  
  <ItemTemplate>
  <%#Container.DataItem("ID")%>
  <br>
  </ItemTemplate>
  </asp:Repeater>
  </ItemTemplate>
  </asp:Repeater
  </asp:Content
  Test.aspx.vb

  Public Class test
  Inherits System.Web.UI.Page

  Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
  Dim cnn As Data.SqlClient.SqlConnection = New Data.SqlClient.SqlConnection(System.Web.Configuration.WebConfigurationManager.ConnectionStrings("GetCategoriesConnectionString").ConnectionString)
  cnn.Open()

  Dim cmd1 As Data.SqlClient.SqlDataAdapter = New Data.SqlClient.SqlDataAdapter("SELECT * from Links", cnn)
  Dim ds As New Data.DataSet()
  cmd1.Fill(ds, "ParentCategory")

  Dim cmd2 As Data.SqlClient.SqlDataAdapter = New Data.SqlClient.SqlDataAdapter("SELECT * from tblRegions", cnn)
  cmd2.Fill(ds, "ID")
  ds.Relations.Add("myrelation", _
  ds.Tables("Links").Columns("ParentCategory"), _
  ds.Tables("tblRegions").Columns("ID"))
  parentRepeater.DataSource = ds.Tables("Links")

  parentRepeater.DataSource = ds.Tables("Links")
  Page.DataBind()
  cnn.Close()

  End Sub

  End Class
  
• Keywords:

  nested, repeater, newbie, ado

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• 1. Hi,Woppie:

     ds.Relations.Add("myrelation", _
     Line 17: ds.Tables("Links").Columns("ParentCategory"), _
     Line 18: ds.Tables("tblRegions").Columns("ID"))"

     I do not see the datatable Links and tblRegions in your ds above.

     According to the following code you have, i suppose the name of the datatable is ParentCategory and ID.

     cmd1.Fill(ds, "ParentCategory")

     cmd2.Fill(ds, "ID")

     rexlin | Sun, 06 Jan 2008 00:26:00 GMT |