CR can not display in C# when using .....

HI
I made a report in crystal report 2008,its working fine into CR2008

i can use simple report and can display into C#.

but i am facing now problem when i change in code of report,
this is code of report  written  into select expert window

    {CompanyInfo.cmpName} = {?CompanyNameParmField} and
    {PurchaseOrder.poSupplierName} = {?SupplierName}  and
    {Users.userLoginStatus};

upto this code working fine in CR 2008 and also in C#
but when add if condition then facing problem in C# but not in CR 2008


if HasValue({?SupplierName}) then
(
booleanVar  flag:=
    {CompanyInfo.cmpName} = {?CompanyNameParmField} and
    {PurchaseOrder.poSupplierName} = {?SupplierName}  and
    {Users.userLoginStatus};
)
else
(
 booleanVar  flag:=  {CompanyInfo.cmpName} = {?CompanyNameParmField} and
                     {Users.userLoginStatus}

)

without using

booleanVar  flag:=
also have same problem.even if do not use it, only one exception msg change little bit

when i use if condition then its work fine into Crystal reports S/W but can not load into  C#.

i got following error when try to load this report into C# CR viewer.

"A number, currncy amount,boolean,date,time,date-time or string is expected here."
C:\filename.rpt
Error in formula <Record Selection>


A number, currncy amount,boolean,date,time,date-time or string is exprected here"

Put this into a formula instead of into the Select Expert.  Take out the booleanvar because you don't need it. For this example, I'll call this formula "SelectIt"