public async Task UpdateIdentityServerUser(string userId, bool enabled) { if (string.IsNullOrEmpty(userId)) { throw new ArgumentNullException("userId"); } var adminStore = new IdentityServer3AdminStore(); var user = await adminStore.FindIdentityServerUserByUserIdAsync(userId); if (user != null) { user.Enabled = enabled; await adminStore.UpdateIdentityServerUserAsync(user); } }