problem with accessing value

[Furtbichler]

Zitat von question:

Code:

...procedure Taccounts .Checkvalue(Sender: TObject);
var
  f : TCalculation ; // i have created an instance of TCalculation    
begin
if f.Newvalue = True then  // i have called the boolean  
End;

... but you are not accessing the instance your have created. Instead, you access 'f', which is undefined at this point.

Where is your created instance of 'TCalculation'?