Downloading design step attachments from HP ALM

I was using below code to download attachments for test cases at the HP ALM TestLab folder,
But then I find out that attachments can be available at the step level too.
So is there any way to download attachments for test steps?
I tried with changing 2nd line to
TDAPIOLELib.StepFactory tsTestFact = tDConnection.StepFactory;

But it was not working.
public void DownloadTestAttachments_FromVB_TestLab()

{

String AttachmentDownloadPath = @”C:temp”;

TDAPIOLELib.TSTestFactory tsTestFact = tDConnection.TSTestFactory;

TDAPIOLELib.List tsTestList = tsTestFact.NewList(“”);

TDAPIOLELib.AttachmentFactory attFact;

TDAPIOLELib.List attList;

Console.WriteLine(“Downloading attachments for the Tests : ” + AttachmentDownloadPath);

try

{

foreach (TDAPIOLELib.TSTest tsItem in tsTestList)

{

if (tsItem.HasAttachment == true)

{

attFact = tsItem.Attachments;

attList = attFact.NewList(“”);

foreach (TDAPIOLELib.Attachment attItem in attList)

{

attItem.Load(true, AttachmentDownloadPath + “\” + attItem.Name);

}

}

}

}

catch (Exception x)

{

Console.WriteLine(x.ToString());

}

}