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);
}
}