直接inlcude它的头部：

to directly inlcude it in the HEAD:

HtmlGenericControl Include = new HtmlGenericControl("script"); 
Include.Attributes.Add("type", "text/javascript"); 
Include.Attributes.Add("src", sInclude); 
this.Page.Header.Controls.Add(Include);

你想检查，以确保它已经不存在添加它之前。

you would want to check to make sure its not there already before adding it.