How to identify Delphi StringList object is created or not

Question

I have declared variable of TStringList in private section. In a button click event I want to access that TStringList object.

sVariable:= TStringList.Create;
sVariable.add('Test1');

Now whenever i click on that button each time its newly created and memory is allocated to that variable. Is there any property/function using which we can determine object is created for that variable or not and it will not give the access violation error also?

Answer 1

if not Assigned(sVariable) then
  sVariable:= TStringList.Create;
sVariable.add('Test1');