Create a Crm console app from scratch.

*Set the project's Target framework to be .Net Framework 4.

*To interact with Crm 2011 API, you can either refer to CRM 2011 sdk binary files or Service Reference
+ If you want to use sdk binary files: Include the
Microsoft.Crm.Sdk.Proxy.dll
Microsoft.Xrm.Sdk.dll in project reference
System.Security
System.Runtime.Serialization
and System.ServiceModel (This is for using WCF)

+ If you want to use Service Reference: Download the Organization Service endpoint from the Crm Developer Resources page.

*Reference the namespaces in the code.
using System.ServiceModel; // For using the WCF
using System.ServiceModel.Description; // You need this to use the ClientCredential class.
//Contains enumerations of possible picklists and integer values for some attributes.
//The naming convention of the classes is to make it easier to locate the specific attribute.
using Microsoft.Crm.Sdk;
//Defines the data contracts for attribute types, interfaces for authoring plug-ins,
//and other general purpose xRM types and methods.
using Microsoft.Xrm.Sdk;
//Defines classes for use by client-code, including a data context,
//proxy classes to ease the connection to Microsoft Dynamics CRM, and the LINQ provider.
using Microsoft.Xrm.Sdk.Client;
// Defines request/response classes for Create, Retrieve, Update, Delete, Associate , Disassociate, and the metadata classes.
using Microsoft.Xrm.Sdk.Messages;
// Defines query classes required to connect to Microsoft Dynamics CRM.
using Microsoft.Xrm.Sdk.Query;
Microsoft.Crm.Sdk.Messages;

The namespaces required for doing a WhoAmIRequest are Microsoft.Crm.Sdk, Microsoft.Xrm.Sdk.Client, Microsoft.Crm.Sdk.Messages, System.ServiceModel, System.ServiceModel.Description.

* Include the deviceidmanager.cs file in the project for authentication. Your can find the class in the crm sdk helper folder \\SDK CRM 2011\sdk\samplecode\cs\helpercode\deviceidmanager.cs.
+ Also include the Microsoft.Crm.Services.Utility namespace.

* Setup the credential which will be used to connect to Crm WCF endpoint

* Connect to WCF endpoint

* Require early bound type support

* Do something with theh endpoint

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel; // For using the WCF
using System.ServiceModel.Description;
// Contains enumerations of possible picklists and integer values for some attributes. 
// The naming convention of the classes is [open arrow brace]entityname[close arrow brace][open arrow brace]attributename[close arrow brace] to make it easier to locate the specific attribute.
using Microsoft.Crm.Sdk;
// Defines the data contracts for attribute types, interfaces for authoring plug-ins, 
// and other general purpose xRM types and methods.
//using Microsoft.Xrm.Sdk;
// Defines classes for use by client-code, including a data context, 
// proxy classes to ease the connection to Microsoft Dynamics CRM, and the LINQ provider.
using Microsoft.Xrm.Sdk.Client;
// Defines request/response classes for Create, Retrieve, Update, Delete, Associate , Disassociate, and the metadata classes.
//using Microsoft.Xrm.Sdk.Messages;
// Defines query classes required to connect to Microsoft Dynamics CRM.
//using Microsoft.Xrm.Sdk.Query;
using Microsoft.Crm.Services.Utility;
using Microsoft.Crm.Sdk.Messages;


namespace CrmConsoleApplication1
{
    class Program
    {
        private static OrganizationServiceProxy _serviceProxy;
        private static ClientCredentials _clientCreds;
        //private static ClientCredentials _deviceCreds;

        static void Main(string[] args)
        {
            // Setup credential
            _clientCreds = new ClientCredentials();
            _clientCreds.Windows.ClientCredential.UserName = "Administrator";
            _clientCreds.Windows.ClientCredential.Password = "NotTheRealPassword";
            _clientCreds.Windows.ClientCredential.Domain = "PLAYGROUND";
            // The DeviceIdManager class registers a computing device with Windows Live ID, through the generation of a device ID and password, 
            // and optionally stores that information in an encrypted format on the local disk for later reuse.
            // This will fail here as this vm don't have access to the Internet therefore there is no way for it to generate a device ID with login.live.com
            //_deviceCreds = DeviceIdManager.LoadOrRegisterDevice();

            // Connect to Crm WCF endpoint
            using (_serviceProxy = new OrganizationServiceProxy(new Uri("http://localhost:5555/CRM2011RTM/XRMServices/2011/Organization.svc"),
                                                                null,
                                                                _clientCreds,
                                                                null))
            {
                // require early bound type support
                _serviceProxy.ServiceConfiguration.CurrentServiceEndpoint.Behaviors.Add(new ProxyTypesBehavior());

                OrganizationServiceContext orgContext = new OrganizationServiceContext(_serviceProxy);
                WhoAmIRequest request = new WhoAmIRequest();
                WhoAmIResponse response = (WhoAmIResponse)orgContext.Execute(request);
                Console.WriteLine("Your Crm user Guid is {0}", response.UserId);
            }

            Console.Read();
        }
    }
}