Program.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

//The service contract is defined using Connected Service "WCF Web Service", generated from the service by the dotnet svcutil tool.

Console.WriteLine("Username authentication required.");
Console.WriteLine(" Please enter a valid domain email address:");
string username = Console.ReadLine();
Console.WriteLine("   Enter password:");
string password = "";
ConsoleKeyInfo info = Console.ReadKey(true);
while (info.Key != ConsoleKey.Enter)
{
    if (info.Key != ConsoleKey.Backspace)
    {
        password += info.KeyChar;
        info = Console.ReadKey(true);
    }
    else if (info.Key == ConsoleKey.Backspace)
    {
        if (password != "")
        {
            password = password.Substring(0, password.Length - 1);

        }
        info = Console.ReadKey(true);
    }
}

for (int i = 0; i < password.Length; i++)
    Console.Write("*");

Console.WriteLine();

// Create a client with given client endpoint configuration
CalculatorServiceClient client = new CalculatorServiceClient();

client.ClientCredentials.UserName.UserName = username;
client.ClientCredentials.UserName.Password = password;

/*
Setting the CertificateValidationMode to PeerOrChainTrust means that if the certificate 
is in the Trusted People store, then it will be trusted without performing a
validation of the certificate's issuer chain. This setting is used here for convenience so that the 
sample can be run without having to have certificates issued by a certificate authority (CA).
This setting is less secure than the default, ChainTrust. The security implications of this 
setting should be carefully considered before using PeerOrChainTrust in production code. 
*/
client.ClientCredentials.ServiceCertificate.Authentication.CertificateValidationMode = System.ServiceModel.Security.X509CertificateValidationMode.PeerOrChainTrust;
// Call the Add service operation.
double value1 = 100.00D;
double value2 = 15.99D;
double result = client.Add(value1, value2);
Console.WriteLine("Add({0},{1}) = {2}", value1, value2, result);

// Call the Subtract service operation.
value1 = 145.00D;
value2 = 76.54D;
result = client.Subtract(value1, value2);
Console.WriteLine("Subtract({0},{1}) = {2}", value1, value2, result);

// Call the Multiply service operation.
value1 = 9.00D;
value2 = 81.25D;
result = client.Multiply(value1, value2);
Console.WriteLine("Multiply({0},{1}) = {2}", value1, value2, result);

// Call the Divide service operation.
value1 = 22.00D;
value2 = 7.00D;
result = client.Divide(value1, value2);
Console.WriteLine("Divide({0},{1}) = {2}", value1, value2, result);

client.Close();

Console.WriteLine();
Console.WriteLine("Press <ENTER> to terminate client.");
Console.ReadLine();