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Editorial Team
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Asked: 2026-06-12T23:53:18+00:00

I am trying to use LINQ on the .NET Membership.GetAllUsers() collection, for example when

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I am trying to use LINQ on the .NET Membership.GetAllUsers() collection, for example when getting all usernames: 

var usernames = Membership.GetAllUsers().Cast<MembershipUser>().Select(x=>x.UserName).ToList();

But VS tells me that it is not supported..

Membership is a part of Web.Security, same as MembershipUser

Here is my connection string (if that is of any relevance):

   <add name="ApplicationServices" connectionString="Data Source=somerserver.xx\SQLEXPRESS;Initial Catalog=bedriftsmelding;User Id=SomeUser;Password=SomePassword;Integrated Security=False" providerName="System.Data.SqlClient" />

Stack trace:

System.NotSupportedException was unhandled by user code
Message=Specified method is not supported.
Source=System.Web.Extensions StackTrace:
at System.Web.ClientServices.Providers.ClientFormsAuthenticationMembershipProvider.GetAllUsers(Int32
pageIndex, Int32 pageSize, Int32& totalRecords)
at System.Web.Security.Membership.GetAllUsers(Int32 pageIndex, Int32 pageSize, Int32& totalRecords)
at System.Web.Security.Membership.GetAllUsers()
at Bedriftsmelding.Nettside.Models.CompanyUsers.GetUserIdFromUserName(String
username) in
C:\Projects\Bedriftsmelding\Bedriftsmelding.Nettside\Models\CompanyUsers.cs:line
26
at Bedriftsmelding.Tests.DTO.CompanyUsersTest.TestGetUserIdFromUserName()
in
C:\Projects\Bedriftsmelding\Bedriftsmelding.Tests\DTO\CompanyUsersTest.cs:line
16 InnerException:

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1 Answer

  1. Editorial Team

    Looks like you’re using a ClientFormsAuthenticationMembershipProvider rather than the default SqlMembershipProvider.

    According to the docs for ClientFormsAuthenticationMembershipProvider, GetllAllUsers is not supported and throws a not supported exception.

    http://msdn.microsoft.com/en-us/library/system.web.clientservices.providers.clientformsauthenticationmembershipprovider.getallusers.aspx

    It appears that only the basic ValiateUser and a few other functions work with this provider, as it’s designed for use with the Ajax extensions. None of the user functions work, such as GetUser, GetAllUsers, DeleteUser, CreateUser, etc…

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