asp.net当修改header时提示：The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>)

The Problem:

后台代码：

HtmlGenericControl jsGC = new HtmlGenericControl("script");
jsGC.Attributes.Add("type", "text/javascript");
jsGC.Attributes.Add("src", "http://www.cnblogs.com/js/Cookie.js");
Page.Header.Controls.Add(jsGC);

 提示错误：

The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>)

The Solution:

A. 把Header中的带有<%=...% >这样的代码移出。

B. 把代码放入placeholder

C. (1). 把<%=..%>改为：＜%# ...%>

    (2). 在page_load函数中增加：Page.Header.DataBind();

D. 动态生成。

参考资料：http://leedumond.com/blog/the-controls-collection-cannot-be-modified-because-the-control-contains-code-blocks/