Question

I implemented membership in asp.net, I have a manager that can define users, users have USER role, when I use below code to assign role, it does not work:

Roles.AddUserToRole(txtUsername.Text, "USER");

Now my question is:
What is the reasons?

when I log in and check its roles, there is no role. I use this code for detect role:

string[] role = Roles.GetRolesForUser(txtUserName.Text);

Answer 1

From MSDN doc:

1. Role management is not enabled. -or- User is already assigned to the specified role.
2. roleName is an empty string or contains a comma (,). -or- username is an empty string or contains a comma (,).
3. roleName is null. -or- username is null.