private void SendEmail(IOrganizationService service, Guid recieverUserId, Guid senderUserId, Guid regardingObjectId, string emailBody, string emailSubject)
{
Entity email = new Entity();
email.LogicalName = “email”;
//Set regarding object property (i.e. The entity record, which u want this email associated with)
EntityReference regardingObject = new EntityReference(“{entity_name}”, regardingObjectId);
email.Attributes.Add(“regardingobjectid”,regardingObject);
//Defining Activity Parties (starts)
EntityReference from = new EntityReference(“systemuser”, senderUserId);
EntityReference to = new EntityReference(“systemuser”,recieverUserId);
//Derive from party
Entity fromParty = new Entity(“activityparty”);
fromParty.Attributes.Add(“partyid”,from);
//Derive to party
Entity toParty = new Entity(“activityparty”);
toParty.Attributes.Add(“partyid”, to);
EntityCollection collFromParty = new EntityCollection();
collFromParty.EntityName = “systemuser”;
collFromParty.Entities.Add(fromParty);
EntityCollection collToParty = new EntityCollection();
collToParty.EntityName = “systemuser”;
collToParty.Entities.Add(toParty);
email.Attributes.Add(“from”,collFromParty);
email.Attributes.Add(“to”, collToParty);
//Defining Activity Parties (ends)
//Set subject & body properties
email.Attributes.Add(“subject”,emailSubject);
email.Attributes.Add(“description”, emailBody);
//Create email activity
Guid emailID = service.Create(email);
//Sending email
SendEmailRequest reqSendEmail = new SendEmailRequest();
reqSendEmail.EmailId = emailID;//ID of created mail
reqSendEmail.TrackingToken = “”;
reqSendEmail.IssueSend = true;
SendEmailResponse res = (SendEmailResponse)service.Execute(reqSendEmail);
}