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問題來自http://topic.csdn.net/u/20120226/15/09b1fd42-b587-483b-b4df-9cba2ef3d0ad.html 也可參考下圖：
Insus.NET提供如下解決方法，僅供參考： 寫一個(gè)接口，  using System;
using System.Collections.Generic; using System.Linq; using System.Web; /// <summary> /// Summary description for ISetable /// </summary> namespace Insus.NET { public interface ISetable { void SetTextBoxText(string value); } }
用戶控件實(shí)作這個(gè)接口， using Insus.NET;
public partial class WebUserControl : System.Web.UI.UserControl,ISetable { public void SetTextBoxText(string value) { this.text2.Text = value; } }
然后在page的Button的Click事件中寫， protected void Button1_Click(object sender, EventArgs e) { ISetable set = (ISetable)this.WebUserControl1; set.SetTextBoxText(this.text1.Text); }
測試：
測試代碼： http://download.cnblogs.com/insus/ASPDOTNET/SetUserControlTextboxText.rar
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