I\'m gonna use JQuery files in my custom ServerControl , thus I have to add below line within Head tag.
You can register custom scripts using the ClientScriptManager.RegisterClientScriptInclude Method during the page load. Alternatively, you can just include the script in your .aspx page. If this is a public server control, the first method is probably more preferable.
EDIT: alternatively you can register scripts in the tag of the page as follows:
HtmlGenericControl jqueryInclude = new HtmlGenericControl("script");
jqueryInclude.Attributes.Add("type", "text/javascript");
jqueryInclude.Attributes.Add("src", "http://");
Page.Header.Controls.Add(jqueryInclude);