Follow the below steps to create a simple Email record in Console application,

Step 1: Open Visual Studio and Create Console Application Project.

Step 2: First we have to establish connection to CRM. Please follow my earlier post Connect to CRM Online or On-premise using C# SDK.

Step 3: Generate Early bound class using Crmsvcutil.exe. Please follow my earlier post Generate Early bound Class using CrmSvcUtil.Exe in CRM.

Step 4: Add EarlyBound.cs to the project.

Step 5: Include the namespace using EarlyBound.cs.

Step 6: Below method will create Email record,

public static void SendEmail(Guid From, Guid To, string ToEntitySchemaName, string Subject, string Description)
{
try
{
// Create 'From' activity party for the email

ActivityParty fromParty = new ActivityParty
{
PartyId = new EntityReference(SystemUser.EntityLogicalName, From)
};

// Create 'To' activity party for the email

ActivityParty toParty = new ActivityParty
{
PartyId = new EntityReference(ToEntitySchemaName, To)
};

// Create an e-mail message

Email email = new Email
{
To = new ActivityParty[] { toParty },
From = new ActivityParty[] { fromParty },
Subject = Subject,
Description = Description,
DirectionCode = true
};

Guid _emailId = _service.Create(email);

SendEmailRequest sendEmailreq = new SendEmailRequest
{
EmailId = _emailId,
TrackingToken = "",
IssueSend = true
};

SendEmailResponse sendEmailresp = (SendEmailResponse)_service.Execute(sendEmailreq);

if (sendEmailresp != null)
{
Console.WriteLine("Email record created successfully");
Console.ReadKey();
}
}
catch(Exception ex)
{
Console.Write("Error " + ex.Message);
Console.ReadKey();
}
}

Step 7: Final Code will be like below,

using Microsoft.Crm.Sdk.Messages;
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Client;
using System;
using System.Collections.Generic;
using System.Linq;
using System.ServiceModel.Description;
using System.Text;
using System.Threading.Tasks;
using EarlyBound;

namespace LinqToCRM
{
class Program
{
static IOrganizationService _service;
static void Main(string[] args)
{
ConnectToMSCRM("arunpotti@XYZOrg.onmicrosoft.com", "password", "https://XYZOrg.api.crm5.dynamics.com/XRMServices/2011/Organization.svc");

Guid userid = ((WhoAmIResponse)_service.Execute(new WhoAmIRequest())).UserId;

if (userid == Guid.Empty) return;

Contact c = new Contact() //Create Contact Record
{
FirstName = "Arvind Kumar",
LastName = "Shah",
MobilePhone = "9876543210",
EMailAddress1 = "arvindshah@crm2015trial.com"
};

Guid contactGuid = _service.Create(c);

if (contactGuid != Guid.Empty)
{
SendEmail(userid, contactGuid, "contact", "Test Subject", "Test Description");
}
}

public static void ConnectToMSCRM(string UserName, string Password, string SoapOrgServiceUri)
{
try
{
ClientCredentials credentials = new ClientCredentials();
credentials.UserName.UserName = UserName;
credentials.UserName.Password = Password;
Uri serviceUri = new Uri(SoapOrgServiceUri);
OrganizationServiceProxy proxy = new OrganizationServiceProxy(serviceUri, null, credentials, null);
proxy.EnableProxyTypes();
_service = (IOrganizationService)proxy;
}
catch (Exception ex)
{
Console.WriteLine("Error while connecting to CRM " + ex.Message);
Console.ReadKey();
}
}

public static void SendEmail(Guid From, Guid To, string ToEntitySchemaName, string Subject, string Description)
{
try
{
// Create 'From' activity party for the email

ActivityParty fromParty = new ActivityParty
{
PartyId = new EntityReference(SystemUser.EntityLogicalName, From)
};

// Create 'To' activity party for the email

ActivityParty toParty = new ActivityParty
{
PartyId = new EntityReference(ToEntitySchemaName, To)
};

// Create an e-mail message

Email email = new Email
{
To = new ActivityParty[] { toParty },
From = new ActivityParty[] { fromParty },
Subject = Subject,
Description = Description,
DirectionCode = true
};

Guid _emailId = _service.Create(email);

SendEmailRequest sendEmailreq = new SendEmailRequest
{
EmailId = _emailId,
TrackingToken = "",
IssueSend = true
};

SendEmailResponse sendEmailresp = (SendEmailResponse)_service.Execute(sendEmailreq);

if (sendEmailresp != null)
{
Console.WriteLine("Email record created successfully");
Console.ReadKey();
}
}

catch(Exception ex)
{
Console.Write("Error " + ex.Message);
Console.ReadKey();
}
}
}
}

Step 8: Execute the project for the below output, Open CRM and check for the email record

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