Get Email ID associated with TriggeredSendDefinition

Question

I want to retrieve the Email object associated with the TriggeredSendDefinition in Exact Target. For this, I am trying to find the location of Email (i.e. Folder ID of the associated Email) for the triggeredSend. I tried retrieving the Email object but it said "Error: The Request Property(s) Email do not match with the fields of TriggeredSendDefinition retrieve". I am required to do this using code (API). Please help.

EDIT

I have tried the following 

String requestID;
String status;
APIObject[] results;
RetrieveRequest rr = new RetrieveRequest{
    ObjectType = "TriggeredSendDefinition",
    Properties =  new string[] { "CustomerKey", "Email.Folder", "Email.Name" }
};
SimpleFilterPart sfp = new SimpleFilterPart{
        Property = "CustomerKey",
        SimpleOperator = SimpleOperators.equals,
        Value = "expiry_notice"
};
rr.Filter = sfp;
soapClient.Retrieve(rr, out requestID, out results);
foreach (TriggeredSendDefinition df in results)
{
    Console.WriteLine(df.CustomerKey + " " + df.Email.Name+" " + df.Email.Folder);
}

Answer 1

The call you are making is to retrieve an Email object, filtered on CustomerKey by the value expiry_notice. In it you are passing Properties = new string[] { "CustomerKey", "Email" } which isn't working. Email is not one of the listed properties on the email object. Also, when you specify properties, you only get those listed in the return.

Delete the line Properties = new string[] { "CustomerKey", "Email" } and it should return the folder information you are looking for.