# Use Unobtrusive Validation in .NET 4.5 WebForms Site or Application with the ScriptManager

## Environment

<table>
	<tbody>
		<tr>
			<td>Product</td>
			<td>Progress® Telerik® UI for ASP.NET AJAX</td>
		</tr>
	</tbody>
</table>

## Description

When you create a .NET 4.5 WebForms Site, it comes with a jQuery library that is already registered with the ScriptManager as `jquery`. The unobtrusive validation will work as long as the standard `asp:ScriptManager` control is used. How can I use unobtrusive validation in a .NET 4.5 WebForms site or application with the ScriptManager?

## Cause

The Telerik controls bring their own specific version of jQuery and the ScriptManager control registers that version as `jquery` after removing all registrations with the same name. As a result, when you replace the `asp:ScriptManager` with a `RadScriptManager`, the initial `jquery`registration will be removed and the unobtrusive validation will not find it.

## Solution

To solve this issue, ensure that only one version of jQuery is used in the website and that you register it so that the unobtrusive validation can locate it:

1. Set the `EnableEmbeddedjQuery` property of the `RadScriptManager` to `false` to disable the jQuery that is embedded in `Telerik.Web.UI`. Thus, the removal of the `jquery` registration that comes with the website project is prevented.

2. Open **TOOLS** > **Library Package Manager** > **Package Manager Console**. Uninstall and unregister the jQuery version that is provided with the Visual Studio template by running the `PM> Uninstall-Package AspNet.ScriptManager.jQuery -Version x.x.x` command. Note that `x.x.x` is the jQuery version that comes installed with the website.

3. Install and register [the jQuery version that is specific for your current Telerik controls version](https://www.telerik.com/products/aspnet-ajax/documentation/integration/jquery) by running the `PM> Install-Package AspNet.ScriptManager.jQuery -Version x.x.x` command in the Package Manager Console. Note that `x.x.x` is the jQuery version that comes with the Telerik controls.

   You can still install a different version from the one included in the Telerik controls. However, this approach is not tested by the team and full compatibility cannot be guaranteed.