Basic console program to acces a WCF service via using username and password.

gistfile1.cs

static void Main(string[] args)
{
    Service1Client client = null;
    try
    {
        // Create the client
        // It will use the settings in the app.config file
        client = new Service1Client();
        // Set credentials
        client.ClientCredentials.UserName.UserName = "USER_PASSWORD";
        client.ClientCredentials.UserName.Password = "USER_PASSWORD";
        client.ClientCredentials.ServiceCertificate.Authentication.CertificateValidationMode =           X509CertificateValidationMode.None;
        // Call a method.
        string result = client.Test(99);
        // Show results.
        Console.WriteLine(string.Format("Result: {0}", result));
        // Wait to exit
        Console.WriteLine("Press [ENTER] to exit.");
        Console.ReadLine();        
    }
    catch (Exception ex)
    {
        // Oups
        Console.ForegroundColor = ConsoleColor.Red;
        Console.WriteLine(string.Format("/!\\ Error:\r\n{0}:\r\n{1}", ex.GetType(), ex.Message));

        if (ex.InnerException != null)
        {
            Console.WriteLine(string.Format("Inner Error:\r\n{0}:\r\n{1}", ex.InnerException.GetType(), ex.InnerException.Message));
        }
        Console.ReadLine();
    }
    finally
    {
        // Clean memory
        if (client != null &&
            client.State != CommunicationState.Closing &&
            client.State != CommunicationState.Closed &&
            client.State != CommunicationState.Faulted)
                ((IDisposable)client).Dispose();
    }
}