Hi Dear

I have data Like:
 Price           PostPaid
 1000$          False
 2000$          True
 100$            True
 1500$          False
 20$              False
----------------------------
I need to show sum of price separately like this:

PostPaid : 2100$
PrePaid :   2520$ 

I Create Formula field and write code but the result is incorrect

Local NumberVar strLen := count({DataTable1.ID});
Local NumberVar result2 := 0;
Local NumberVar i := 0;

While i < strLen Do
(
   If  {DataTable1.PostPaid}  Then result2 := {DataTable1.Debit} + result2;

 i := i + 1;
);
result2;

what you could do, is create two extra formulas. These could look like

{@True)
if {dataTable1.PostPaid} = True then Price else 0
{@False}
if {dataTable1.PostPaid} = False then Price else 0

Place these in your report (you can suppress them)
And then create 2 formulas to sum them.
{@PostPaid}
sum({@True})
{@PrePaid}
sum({@False})