How to give full path installdirectory in installation time

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InnoSetup

How to give the installdirectory full path?
Examples
Installation time its asking installdirectory i will select c://program files
But installation time its taken only c:\\program

Its not taken full path, space


I need full path
What value i need to pass

What I have tried:

//Vp6 DIRECTORY: 
  DirInputPage := CreateInputDirPage(wpWelcome, 'VP6 Directory', '', '', False, ''); 
           DirInputPage.Add('select VP6 Installation path:'); 
  DirInputPage.Values[0] := ExpandConstant('');  
  DirInputPage.OnNextButtonClick := @DirInputPage_OnNextButtonClick; 
   
  AfterID := DirInputPage.ID;