Finding Folders and cycles from Releases section in ALM?

Hi, 

I have successfully retrived all the fields from Testsets and Defects sections by creating object in the following way. (By using C#)

TDConnection qcc = qccTDConnection;

BugFactory bf = (BugFactory)qcc.BugFactory;
List bugs = (List)bf.NewList(bf.Filter.Text);

foreach (TDAPIOLELib.Bug bg in bugs)
{
//store that value in to dataset

status = Convert.ToString(bg["BG_STATUS"]);
assignTo = bg.AssignedTo.ToString();
priority = Convert.ToString(bg["BG_PRIORITY"]); // PRIORITY VERY HIGH
}

This is fine ,But now i want to get the fields from Releses (cycles, folder... ). Here i tried like below but it couldnt work.

ReleaseFolderfactory rel = (Release)qcc.ReleaseFolderFactory;
List listRel = (List)rel.NewList(rel.Filter.Text);

foreach(TDAPIOLELib.Release rl in listRel)

{

string PlanStartDate = Convert.ToString(rl["RCYC_START_DATE"]);
string PlanEndDate = Convert.ToString(rl["RCYC_START_DATE"]);

}

Any one help me to solve this.. 

Thanks in advance.