Concat with multiple IF statements

Not sure if this is possible, however I am trying to concatenate the below code depending on if the value is true. Ideally it would go something like:- "Bob, Harry" "Jim, Harry"

I've tried a few different ways but cannot get it to work, if it's even possible. Any pointers would be appreciated.

void Memo7OnBeforePrint(TfrxMemoView Sender)
{

if(<MRNAttempt_DS."PT_ID1">   != 0)
  {                   
  Sender.Text = "BOB";   
  }   

if(<MRNAttempt_DS."PT_ID2"> != 0)
  {
  Sender.Text = "Jim";                                                              
  }   

if(<MRNAttempt_DS."PT_ID3"> != 0)
  {
Sender.Text = "Harry";                                                              
  }                         
}