/// <summary>
/// Signs in.
/// </summary>
/// <param name="userName">Name of the user.</param>
/// <param name="createPersistentCookie">if set to <c>true</c> [create persistent cookie].</param>
public void SignIn(string userName, bool createPersistentCookie)
{
ValidationUtility.ValidateRequiredStringValue(userName, "userName");
FormsAuthentication.SetAuthCookie(userName, createPersistentCookie);
}