Hi Ken,
My name is Allen Chen. It's my pleasure to work with you on this issue.
From your description I think your requirement is to share a value between
two Web User Controls. Is my understanding correct?
If so please try following steps. It will create a demo project that
demonstrates how to do this.
1. Create an ASP.NET Web Project in Visual Studio 2008
2. Add two Web User Controls in this project. Name them as WebUserControlA
and WebUserControlB.
3. Paste following code in WebUserControlA.ascx:
<%@ Control Language="C#" AutoEventWireup="true"
CodeBehind="WebUserControlA.ascx.cs"
Inherits="WebApplication6.WebUserControlA" %>
WebUserControlA
<asp:Button ID="Button1" runat="server" Text="Get Value from
WebUserControlB"
onclick="Button1_Click" />
<br />
<asp:Label ID="Label1" runat="server" Text=""></asp:Label>
4. Paste following code in WebUserControlA.ascx.cs:
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
namespace WebApplication6
{
public partial class WebUserControlA : System.Web.UI.UserControl
{
protected override void OnInit(EventArgs e)
{
Page.RegisterRequiresControlState(this);
base.OnInit(e);
}
public string WebUserControlB_ID
{
get;
set;
}
protected override object SaveControlState()
{
return WebUserControlB_ID;
}
protected override void LoadControlState(object state)
{
if (state != null)
{
WebUserControlB_ID = (string)state;
}
}
protected void Button1_Click(object sender, EventArgs e)
{
if (this.Parent == null) {
throw new Exception("This UserControl must be put in a
Container!");
}
else if (WebUserControlB_ID != null)
{
WebUserControlB wb =
this.Parent.FindControl(WebUserControlB_ID) as WebUserControlB;
if (wb != null)
{
this.Label1.Text = "Value is: " + wb.SharedValue;
}
}
}
}
}
5. Paste following code in WebUserControlB.ascx:
<%@ Control Language="C#" AutoEventWireup="true"
CodeBehind="WebUserControlB.ascx.cs"
Inherits="WebApplication6.WebUserControlB" %>
WebUserControlB
<br />
Input Value: <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<br />
<asp:Button ID="Button1"
runat="server" Text="Save Value" onclick="Button1_Click" />
6. Paste following code in WebUserControlB.ascx.cs:
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
namespace WebApplication6
{
public partial class WebUserControlB : System.Web.UI.UserControl
{
public string SharedValue { get; set; }
protected override void OnInit(EventArgs e)
{
Page.RegisterRequiresControlState(this);
base.OnInit(e);
}
protected override object SaveControlState()
{
return SharedValue;
}
protected override void LoadControlState(object state)
{
if (state != null)
{
SharedValue = (string)state;
}
}
protected void Button1_Click(object sender, EventArgs e)
{
this.SharedValue = this.TextBox1.Text;
}
}
}
7. Paste following code in Default.aspx:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs"
Inherits="WebApplication6._Default" %>
<%@ Register src="WebUserControlA.ascx" tagname="WebUserControlA"
tagprefix="uc1" %>
<%@ Register src="WebUserControlB.ascx" tagname="WebUserControlB"
tagprefix="uc2" %>
<!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:Button id="Button1" runat="server" Text="View1"
OnClick="Button1_Click" />
<asp:Button id="Button2" runat="server" Text="View2"
OnClick="Button2_Click" />
<br /><br />
<asp:MultiView id="MultiView1" runat="server" ActiveViewIndex=0>
<asp:View id="View1" runat="server">
<uc1:WebUserControlA ID="WebUserControlA1"
runat="server" WebUserControlB_ID="WebUserControlB1" />
</asp:View>
<asp:View id="View2" runat="server">
<uc2:WebUserControlB ID="WebUserControlB1"
runat="server" />
</asp:View>
</asp:MultiView>
</div>
</form>
</body>
</html>
8. Paste following code in Default.aspx.cs:
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
namespace WebApplication6
{
public partial class _Default : System.Web.UI.Page
{
protected void Button1_Click(object sender, EventArgs e)
{
MultiView1.SetActiveView(View1);
}
protected void Button2_Click(object sender, EventArgs e)
{
MultiView1.SetActiveView(View2);
}
}
}
9. Set Default.aspx as the start page. Start debugging.
10. Click "View2" button to view the WebUserControlB. Input some value.
Click the "Save" button.
11. Click "View1" button to back to the WebUserControlA. Click the "Get
Value from WebUserControlB" button to retrieve data from WebUserControlB.
The data will be displayed below this button.
To explain the code:
The shared data is exposed via a property in WebUserControlB and stored via
the control state. Thus it can be maintained after postback. Please refer
to the following article to learn more about the SaveControlState/
LoadControlState method.
http://msdn.microsoft.com/en-us/library/system.web.ui.control.savecontrolsta
te.aspx
We need to provide the ID of the WebUserControlB for the WebUserControlA to
get the reference of the WebUserControlB via FindControl method and then
get the shared data.
Please have a try and let me know if it works. If you have further
questions please feel free to ask.
Regards,
Allen Chen
Microsoft Online Support
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