Problem in stored procedure through C#.Net

Hi every1,
i m facing a problem with my stored procedure,named "procPayment".
I am doing update or insert through this stored procedure depending on whether that empid exist in table Paymentmaster.if data exist in table ,"procPayment" will upadte the other details if not it will insert the details...
i wud like to get whether my syntax is fine or not'my stored procedure is like this :

DELIMITER $$;

DROP PROCEDURE IF EXISTS `jaldb`.`procPayment`$$

CREATE DEFINER=`jaldb`@`badda` PROCEDURE `procPayment`
(
in yr integer,in mnth integer,in varempid text,
p_conveyenceAllownce text,p_deputation text,p_Exgratia text,p_GPF text,p_HouseLoan text,
p_HRA text,p_HillDevAllowance text,p_MedicalAdvance text,p_MedicalReimb text,p_Other1 text,
p_Other2 text,p_OverTime text,p_Personal text,p_TABill text,p_TravelAdvance text,p_MedicalAllowance text,p_Basic text,p_Add text,p_AdditionalDA text,p_DA text,p_employeeid text,p_monthid text,p_special text,p_TotalPayment text,p_ToBank text
)

BEGIN
declare empidnew text;
declare paydate varchar(10);
declare tempempid text;
if mnth <10 then
set paydate = concat('01','/0',mnth,'/',yr);
else
set paydate = concat('01','/',mnth,'/',yr);
end if;

set tempempid = concat('0', varempid);
set empidnew=(Select empid from paymentmaster where payrolldate=paydate and empid=varempid);

if (empidnew != null) then

update paymentmaster
set
Basic=p_Basic,
add50per=p_Add,
special=p_special,
conveyanceallowance=p_conveyenceAllownce,
deputation=p_deputation,
personal=p_Personal,
DA=p_DA,
additionalDA=p_AdditionalDA,
HRA=p_HRA,
hilldevAllowance=p_HillDevAllowance,
overtime=p_OverTime,
MedicalAdvance=p_MedicalAdvance,
GPFAdvance=p_GPF,
medicalallowance=p_MedicalAllowance,
exgratia=p_Exgratia,
houseloan=p_HouseLoan,
medicalreimb=p_MedicalReimb,
traveladvance=p_TravelAdvance,
TABill=p_TABill,
other1=p_Other1,
other2=p_Other2,
totalpayment=p_TotalPayment,
tobank=p_ToBank
where empid=varempid;

ELSE

insert into paymentmaster
(
empid,payrollDate, Basic, Add50per, Special,ConveyanceAllowance,
Deputation,Personal,DA,AdditionalDA,HRA,HillDevAll owance,OverTime,
MedicalAdvance,GPFAdvance,MedicalAllowance,
Exgratia,HouseLoan,MedicalReimb,TravelAdvance,TABi ll,Other1,Other2,
TotalPayment,ToBank,ltaMasterId
)
values
(
empidnew, paydate,p_Basic,p_Add,p_special,p_conveyenceAllown ce,
p_deputation,p_Personal,p_DA,p_AdditionalDA,p_HRA, p_HillDevAllowance,p_OverTim e,
p_MedicalAdvance,p_GPF,p_MedicalAllowance,
p_Exgratia,p_HouseLoan,p_MedicalReimb,p_TravelAdva nce,p_TABill,p_Other1,p_Othe r2,
p_TotalPayment,ToBank,0
);

end if;

END$$

DELIMITER ;$$