showing exception in membership provider method

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please help me in finding the solution of the problem

MembershipUserCollection users = new MembershipUserCollection();

users = Membership.GetAllUsers();
it shows the exception like this...

Exception Details: System.InvalidCastException: Specified cast is not valid.

it was working fine few hours ago and i was able to get all users from the database.....
i dont know what happened....
plz help me in this...very critical...

Posted 4-Mar-11 10:31am

mutex_semaphore

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Albin Abel · Answer 1 · 2011-03-04T18:08:00

Once worked and now not working generally means, it is not referring the correct type.

The reference to System.Web.Security may be removed or the project may be corrupted. Check you have the reference still.

It can also happen if you define a class in your project with same name like "Membership" or "MembershipUserCollection".

You can try using the fully qualified name and check like...

System.Web.Security.MembershipUserCollection users = new System.Web.Security.MembershipUserCollection();

users = System.Web.Security.Membership.GetAllUsers();