Custom Workflow for sending Remainder mail in MS CRM 2013/2015 online

Question

Hi All,
We have a requirement to send a remainder email before 5 days,3 days and on the same day of the M/TC date in lead form. To achieve this we tried using Custom Workflow. Below is the logic tried but in the highlighted line
not able to retrieve the "M/TC date" value, this results in no output.
Kindly suggest where we are going wrong or a best approach to do this.
Parameters:
        [RequiredArgument]
        [Input("InputEntity")]
        [ReferenceTarget("lead")]
public
InArgument<EntityReference>inputlead
{ get;
set; }
        [Output("TaskCreated")]
        [ReferenceTarget("task")]
public
OutArgument<EntityReference>
taskCreated { get;
set; }
code:
            try 
            Entity lead
= (Entity)service.Retrieve("lead",
context.PrimaryEntityId, new ColumnSet(newString[]
{ "new_mtcdate" })); //  (unable to
retrieve the mtcdate)            
                  Guid leadId
= this.inputlead.Get(executionContext).Id;
                if(lead.Contains("new_mtcdate"))
                  {  DateTime date
= DateTime.Now;
                      DateTime mtcdate
= (DateTime)lead["new_mtcdate"];
                      TimeSpan elapsed
= date.Subtract(mtcdate);
                      double days
= elapsed.TotalDays;
                      Entity task
= new Entity();
                      task.LogicalName = "task";
                      if (days
== 5)
                      {task["subject"]
= "Five days more for the Meeting";
                          task["regardingobjectid"]=new EntityReference("lead",leadId);
                           Guid taskId
= service.Create(task);
                        this.taskCreated.Set(executionContext,new EntityReference("task",
taskId));}
                      if (days
== 3)
                      {task["subject"]
= "Three days more for the Meeting";
                          task["regardingobjectid"]=new EntityReference("lead",leadId);
                           Guid taskId
= service.Create(task);
                        this.taskCreated.Set(executionContext,new EntityReference("task",
taskId));}
                      if (days
== 0)
                      {task["subject"]
= "Today you have Meeting";
                          task["regardingobjectid"]=new EntityReference("lead",leadId);
                           Guid taskId
= service.Create(task);
                        this.taskCreated.Set(executionContext,new EntityReference("task",
taskId));
Regards, Rekha.J

Answer 1

Hi,
Try with replacing
Entity lead = service.Retrieve("lead", context.PrimaryEntityId, new ColumnSet(new string[] { "new_mtcdate" }));
also make it confirm, you are getting EntityId.
Also check  Link