ClientScriptManager.RegisterClientScriptInclude Method (Type, String, String)


Registers the client script include with the Page object using a type, a key, and a URL.

Namespace:   System.Web.UI
Assembly:  System.Web (in System.Web.dll)

public void RegisterClientScriptInclude(
	Type type,
	string key,
	string url


Type: System.Type

The type of the client script include to register.

Type: System.String

The key of the client script include to register.

Type: System.String

The URL of the client script include to register.

Exception Condition

The client script include type is null.


The URL is null.

- or -

The URL is empty.

This overload of the RegisterClientScriptInclude method takes key and url parameters to identify the script, as well as a type parameter to specify the identification of the client script include. You specify the type based on the object that will be accessing the resource. For instance, when using a Page instance to access the resource, you specify the Page type.


To resolve the client URL, use the ResolveClientUrl method. This method uses the context of the URL on which it is called to resolve the path.

This method adds a script block at the top of the rendered page.

The following code example demonstrates the use of the RegisterClientScriptInclude method. Note that if the logic to check for the existing client script include were removed, there would still not be duplicate client scripts in the rendered page because the RegisterClientScriptInclude method checks for duplicates. The benefit of checking is to reduce unnecessary computation.

<%@ Page Language="C#"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 

<script runat="server">
    public void Page_Load(Object sender, EventArgs e)
        // Define the name, type and url of the client script on the page.
        String csname = "ButtonClickScript";
        String csurl = "~/script_include.js";
        Type cstype = this.GetType();

        // Get a ClientScriptManager reference from the Page class.
        ClientScriptManager cs = Page.ClientScript;

        // Check to see if the include script exists already.
        if (!cs.IsClientScriptIncludeRegistered(cstype, csname))
            cs.RegisterClientScriptInclude(cstype, csname, ResolveClientUrl(csurl));

<html xmlns="" >
    <title>ClientScriptManager Example</title>
     <form id="Form1" runat="server">
        <input type="text"
        <input type="button" 

This example requires a JavaScript file named Script_include.js with the following contents:

function DoClick() {Form1.Message.value='Text from include script.'}

.NET Framework
Available since 2.0
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