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      StringBuilder s = new StringBuilder();
        s.Append("<script language=javascript>");
        s.Append("var a=window.showModalDialog('Default2.aspx');");
        s.Append("if(a!=null)");
        s.Append("document.all('TextBox1').value=a;");
        s.Append("</script>");
        Type cstype = this.GetType();
        ClientScriptManager cs = Page.ClientScript;
        string sname = "lt";
        if (!cs.IsStartupScriptRegistered(cstype, sname))
            cs.RegisterStartupScript(cstype, sname, s.ToString());
Default2.aspxÒ³ÃæÄÚÓÐÒ»¸öCheckBoxList1¼°Ò»¸öButton1£¬Button1Ö´Ðзµ»ØÑ¡ÔñµÄCheckBoxList1µÄÖµ£¬²¢½«µ±Ç°Ò³Ãæ¹Ø±Õ¡£
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CODE:
    protected void Button1_Click(object sender, EventArgs e)
    {
        StringBuilder s = new StringBuilder();
        s.Append("<script language=javascript>" + "\n");
        s.Append("window.returnValue='" + this.GetSelectValue() + "';" + "\n");
        s.Append("window.close();"+"\n");
        s.Append("</script>");
        Type cstype = this.GetType();
        ClientScriptManager cs = Page.ClientScript;
        string csname = "ltype";
        if (!cs.IsStartupScriptRegistered(cstype, csname))
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