asp.net UserId MemberShip

Zanima me na kak način se da dobit UserId.

Ko se prijavim z username ter passwordom,se bi ob uspeli prijavi naj zapisal userid v nek string.

Probal sem sledeče:
MembershipUser user;
protected void Login1_LoggedIn(object sender, EventArgs e)
{
user = Membership.GetUser();
string ii = user.ProviderUserKey.ToString();
}
javi mi pa:
Object reference not set to an instance of an object.

Ne dela!

Tle javi error:
ii = user.ProviderUserKey.ToString();

napaka:
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

null dobi.


lp,

Aha, če hočeš dobit UserId uporabnika v nek string v VB izgleda tako

Dim MyID as string

MyId = Membership.GetUser("imeUporabnika").ProviderUserKey.ToString

To je vse, meni dela...