how can have a formula field in rdlc report

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CrystalReports

RDLC

hi to all
i have a formula filed in crystal report same as below:

Shared Numbervar SumLogout;
Shared Numbervar Row;
Stringvar Minutes;
Stringvar Hours;
Stringvar HoursMinutes;
HoursMinutes:="";
If SumLogout=0 Then HoursMinutes:="00:00";
If (SumLogout<>0 And Row>1) Then Hours:=Totext(SumLogout\(Row-1)\60);
If (SumLogout<>0 And Row>1) Then Minutes:=Totext(SumLogout\(Row-1) Mod 60);
If Len(Hours)=4 Then Hours:="0"+Hours;
If Len(Minutes)=4 Then Minutes:="0"+Minutes;
If SumLogout<>0 Then HoursMinutes:=Left(Hours,Len(Hours)-3)+":"+Left(Minutes,Len(Minutes)-3);
Replace(HoursMinutes,",","");

i want to convert this formula in rdlc
i khnow that we can add a expresion in rdlc and convert this code
but the expresion always get a value like this
=short expresion
and we cant have a block of code same as above to this expresion
how can do this in rdlc report ?
thank for any idea