Access User Control From another User Control


I have a number of pages all with two user controls on them.  I need to access controls/properties from one user control from within another.  I've tried the following from one of the user controls:

Dim pg as Page = cType(Me.Page, Page)

pg.FindControl("myControl")  'Returns nothing

pg.form.findControl("myControl")  'Returns nothing


I also have public properties declared but I can't see those either (I also tried public shared property).  Can anyone help with the syntax?




7/6/2007 4:37:21 PM 93655 articles. 6 followers. Follow

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"myControl" - is it ID of your user control on the page?


7/6/2007 4:47:07 PM

Yes.  The pages look like the following:


<%@ Page Language="VB" MasterPageFile="~/BAndC.master" AutoEventWireup="false" CodeFile="QACoordinator.aspx.vb" Inherits="Apps_QA_OCR_Queues_QACoordinator" title="QA Coordinator Queue" Theme="CVS"%>

<%@ Register Src="~/Apps/QA/OCR/CDWSearch.ascx" TagName="CDWSearch" TagPrefix="uctl" %>

<%@ Register Src="~/Apps/QA/OCR/CDWSearchResults.ascx" TagName="CDWSearchResults" TagPrefix="uctl" %>

<asp:Content ID="Content1" ContentPlaceHolderID="cpLeftNav" Runat="Server">

<uc2:LeftNav ID="LeftNav1" runat="server" />

<uctl:CDWSearch ID="uct1" runat="server" />


<asp:Content ID="Content2" ContentPlaceHolderID="cpMain" Runat="Server">

<uctl:CDWSearchResults ID="myControl" runat="server" />


From uct1:

Protected Sub btnSearch_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSearch.Click

Dim p As Page = CType(Me.Page, Page)  'Get reference to aspx page

pg.FindControl("myControl")  'Returns nothing

pg.form.findControl("myControl")  'Returns nothing

End Sub
7/6/2007 5:04:10 PM
You could expose a 2 public properties on the page that refer to the 2 controls.
Then use:

Page.Control1 from control2
Page.Control2 from control1


7/6/2007 5:25:48 PM


Declare circular refences in two control.

//code of Control1

Control2 _C2;

public Control2 C2  { get { return _C2; } set { _C2 = value; } }

// code of Control2 

Control1 _C1;

public Control1 C1  { get { return _C1; } set { _C1 = value; } }

In the page load event of you web page, initialize these reference

webControl1.C2 = webControl2;

webControl2.C1 = webControl1;

 Now you can reference public properties of these control from using these references


Gursharn Singh

[Don't forget to click on Mark As Answer on the post that helped you ]
7/6/2007 7:03:07 PM


Based on my understanding, you could use Me.Parent to get the Page object on which the WebUserControl nested in.

Please try the following code


<%@ Control Language="C#" AutoEventWireup="true" CodeFile="WebUserControl.ascx.cs" Inherits="WebUserControl" %>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>


<%@ Control Language="VB" AutoEventWireup="false" CodeFile="WebUserControl2.ascx.vb" Inherits="WebUserControl2" %>
<%@ Reference VirtualPath="~/WebUserControl.ascx" %>
<asp:Button ID="Button1" runat="server" Text="Button" />

Partial Class WebUserControl2
    Inherits System.Web.UI.UserControl
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
         End Sub

    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim we As WebUserControl = CType(Me.Parent.FindControl("WebUserControl1"), WebUserControl)

        CType(we.FindControl("TextBox1"), TextBox).Text = "abc"


    End Sub
End Class

In the aspx page

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default2.aspx.vb" Inherits="Default2" %>

<%@ Register Src="WebUserControl.ascx" TagName="WebUserControl" TagPrefix="uc2" %>

<%@ Register Src="WebUserControl2.ascx" TagName="WebUserControl2" TagPrefix="uc1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">

<html xmlns="" >
<head runat="server">
    <title>Untitled Page</title>
    <form id="form1" runat="server">
        &nbsp;<uc1:WebUserControl2 ID="WebUserControl2_2" runat="server" />
        <uc2:WebUserControl ID="WebUserControl1" runat="server" />

Hope it helps,


Jessica Cao
Microsoft Online Community Support

“Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. ”
7/10/2007 8:28:36 AM

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