我以这种方式尝试过，并且有效:

I tried in this way and it worked:

在网页1中编写了一个用于关闭/删除iframe的函数:

In webpage 1 wrote a function which closes/removed iframe:

<script type="text/JavaScript" language="JavaScript">
var removeMyIFrame = function() {
     $('#MyiFrame').remove();
}
   </script>

使用以下代码段从第二页调用上述功能:

called above function from secodnd page using below snippet:

ASPX:

<script type="text/JavaScript" language="JavaScript">
        function CloseMe() {
            parent.removeMyIFrame()
        }
   </script>

.CS按钮单击:

  ScriptManager.RegisterStartupScript(Me.Page, Page.[GetType](), "text", "CloseMe()", True)