ESRI.ArcGIS.Client.Toolkit.SignInDialog.ChallengeIWA C# (CSharp) Method

		private static bool ChallengeIWA(IdentityManager.CredentialRequestInfos credentialRequestInfos,
		                                         Action<IdentityManager.Credential, Exception> callback)
		{
			if (credentialRequestInfos.AuthenticationType == IdentityManager.AuthenticationType.NetworkCredential &&
				credentialRequestInfos.ResponseHeaders != null && CredentialCache.DefaultCredentials != null)
			{
				// test that we didn't already try the IWA authentication
				if (TryDone(credentialRequestInfos.Url))
					return false;

				// get the WWW-Authenticate header
				string header = credentialRequestInfos.ResponseHeaders.Get("WWW-Authenticate");

				// if the header contains NTLM the server is using Integrated Windows 
				// Authentication (IWA), so try the current user's credentials
				if (!string.IsNullOrEmpty(header) && header.Contains("NTLM")) // IWA
				{
					var credential = new IdentityManager.Credential
					{
						Url = credentialRequestInfos.Url,
						Credentials = CredentialCache.DefaultCredentials
					};
					AddTry(credentialRequestInfos.Url);
					callback(credential, null);
					return true;
				}
			}
			return false;
		}