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# WebSecurity - RequireUser() * * WebSecurity Object](#) * * * ## Definition If the specified user is not logged in, the **RequireUser()** method sets the HTTP status to 401 (Unauthorized). * * * ## C# and VB Syntax WebSecurity.RequireUser(userId) or WebSecurity.RequireUser(userName) * * * ## Parameters | Parameter | Type | Description | | --- | --- | --- | | _userID_ | Integer | User ID | | _userName_ | String | User name | * * * ## Return Value None. * * * ## Errors and Exceptions In the following cases, any access to the **WebSecurity** object will throw an **InvalidOperationException**: * The **InitializeDatabaseConnection()** method has not been called. * **SimpleMembership** is not initialized (or is disabled in the website configuration). * * * ## Remarks **RequireUser()** verifies whether the current user is the specified user. To verify whether the current user is authenticated, use the **RequireAuthenticatedUser()** method. To verify whether the user is a member of a role, use the **RequireRoles()** method. **RequireUser()** only allows the specified user to access the web page. The recommended method to restrict page access is to create a role and use the **RequireRoles()** method to verify if the user is a member of that role. * * * ## Technical Data | Name | Value | | --- | --- | | Namespace | WebMatrix.WebData | | Assembly | WebMatrix.WebData.dll | * * WebSecurity Object](#)