Adding controls to Repeater Control dynamically

[Komil13]

Hello

I have a repeater control that is getting results from the database. Now, I would like to dynamically create another repeater control inside the <itemtemplate>. I have placed a PlaceHolder control in the <itemtemplate> tag. I then create a repeater object dynamically, collect additional records that would be displayed in the child repeater object, and try to display it. Everytime I try to add the child repeater object to the Placeholder, I get the following error.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Any Ideas ??

 

[Komil13]

I figured that adding code would help. Here is the code from the aspx page:

<asp:Repeater ID="rptCategories" runat="server" >

<itemtemplate>
<table border="0" width="730">
<tr><td class="box2"><span class="regtext"><%# DataBinder.Eval(Container.DataItem, "CategoryID_PK") %> - <%# DataBinder.Eval(Container.DataItem, "Category") %></span><br>
<asplaceHolder ID="plhSubCategories" runat="server" />
</td></tr>
</table><p>
</itemtemplate>

</asp:Repeater>


Here is the code from the corresponding .vb file:

Sub Page_Load()
'Check if the user has logged in
Check_Cookie()

'Get all the categories from the db.
Dim conCategories as SqlConnection = New SqlConnection( "server=localhost;database=kstore;user id=komil13;pwd=admin13" )
Dim cmdCategories as SqlCommand = New SqlCommand( "Select * From tblCategories", conCategories )
Dim dtrCategories as SqlDataReader

'Open connection, execute the command & assign to the datareader
conCategories.Open()
dtrCategories = cmdCategories.ExecuteReader()

rptCategories.DataSource = dtrCategories
rptCategories.DataBind()

'Close all connections
dtrCategories.Close()
conCategories.Close()
'End Sub

'Sub rptCategories_ItemCreated( s As Object, e As RepeaterItemEventArgs )
'Get all the categories from the db.
Dim conSubCategories as SqlConnection = New SqlConnection( "server=localhost;database=kstore;user id=komil13;pwd=admin13" )
Dim cmdSubCategories as SqlCommand = New SqlCommand( "Select * From tblSubCategories", conSubCategories )
Dim dtrSubCategories as SqlDataReader

'Open connection, execute the command & assign to the datareader
conSubCategories.Open()
dtrSubCategories = cmdSubCategories.ExecuteReader()

dim rpt as Repeater
rpt = New Repeater
rpt.id = "rptSubCategories"
rpt.datasource = dtrSubCategories
rpt.Databind()

plhSubCategories.Controls.Add( rpt )
'Insert the SubCategories

'Close all connections
dtrSubCategories.Close()
conSubCategories.Close()
End Sub