一:在页面中使用隐藏字段的方法:
     A:定义隐藏字段
                RegisterHiddenField(变量名, 初始值)
     B:在运行中设置隐藏字段的内容
                javascript:document.forms[0].变量名.value='';document.forms[0].submit;
     C:取得隐藏字段的值
                Request.Form(变量名)

     例:Page_Load....

          RegisterHiddenField("__hideField","")

          IF Not Request.Form("__hideField") Is Nothing Then
          Response.Write(Request.Form("__hideField"))
          End IF
          -----------------------------------------------------------------------------------
         在需设定隐藏字段内容的方法中
          Dim SetValue as string
          SetValue = "<script>document.forms[0].__hideField.value='FSVision';" _
                           & " document.forms[0].submit;</script>"
          Page.RegisterStartupScript("SetValue ", SetValue )