Microsoft.WindowsAzure.Commands.Utilities.Common.Authentication.AdalTokenProvider.AcquireToken C# (CSharp) Method

        private AuthenticationResult AcquireToken(AdalConfiguration config, string userId = null)
        {
            AuthenticationResult result = null;
            Exception ex = null;

            var thread = new Thread(() =>
            {
                try
                {
                    var context = CreateContext(config);
                    if (string.IsNullOrEmpty(userId))
                    {
                        ClearCookies();
                        result = context.AcquireToken(config.ResourceClientUri, config.ClientId,
                            config.ClientRedirectUri, PromptBehavior.Always, AdalConfiguration.EnableEbdMagicCookie);
                    }
                    else
                    {
                        result = context.AcquireToken(config.ResourceClientUri, config.ClientId,
                            config.ClientRedirectUri, userId, AdalConfiguration.EnableEbdMagicCookie);
                    }
                }
                catch (Exception threadEx)
                {
                    ex = threadEx;
                }
            });

            thread.SetApartmentState(ApartmentState.STA);
            thread.Name = "AcquireTokenThread";
            thread.Start();
            thread.Join();
            if (ex != null)
            {
                var adex = ex as ActiveDirectoryAuthenticationException;
                if (adex != null)
                {
                    if (adex.ErrorCode == ActiveDirectoryAuthenticationError.AuthenticationCanceled)
                    {
                        throw new AadAuthenticationCanceledException(adex.Message, adex);
                    }
                }
                throw new AadAuthenticationFailedException(GetExceptionMessage(ex), ex);
            }

            return result;
        }