在asp.net 2.0中，要在不同的web控件之间互相调用，必须要<%@ Reference VirtualPath="另一控件名称“>
来引用，举例如下
default.aspx:
<form %>
<%@ Reference VirtualPath="~/WebUserControl2.ascx" %>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
这里放置一个按钮，然后用reference来引用控件2
webcontrol.ascx.cs:
protected void Button1_Click(object sender, EventArgs e)
{
WebUserControl2 w = Page.FindControl("WebUserControl2_1") as WebUserControl2;
w.Text = "Hello all!";
}
对于控件2：
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="WebUserControl2.ascx.cs" Inherits="WebUserControl2" %>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
控件2的codebehind代码：
public partial class WebUserControl2 : System.Web.UI.UserControl
{
protected void Page_Load(object sender, EventArgs e)
{
}
public string Text
{
set { TextBox1.Text = value; }
}
}