void SetQVWSAuthentication(
	Guid qvwsID,
	QVWSAuthentication authenticationType
)

Sub SetQVWSAuthentication ( 
	qvwsID As Guid,
	authenticationType As QVWSAuthentication
)

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using QMSAPI;

class Program
{
     static void Main(string[] args)
     {
         try
         {
            // create a QMS API client
            IQMS apiClient = new QMSClient();

            //retrieve a time limited service key
            ServiceKeyClientMessageInspector.ServiceKey = apiClient.GetTimeLimitedServiceKey();
            *********************************************************************************************
            //get a list of all QVWSs
            ServiceInfo[] webServers = apiClient.GetServices(ServiceTypes.QlikViewWebServer);

               //get the current authentication type for the first QVWS in the list
               QVWSAuthentication authentication = apiClient.GetQVWSAuthentication(webServers[0].ID);

            //set the authentication type to NTLM
            authentication.AuthenticationType = QVWSAuthenticationType1.Ntlm;
            apiClient.SetQVWSAuthentication(webServers[0].ID, authentication);

            Console.WriteLine("Authentication type set to NTLM.");
         }
         catch(Exception e)
         {
             Console.WriteLine("An error occured: " + e.Message);
         }
         // wait for user to press any key
         Console.ReadLine();
     }
}