Error...

[Wong CS]

Dear developer,

I have experience this error message:

System.NullRefe renceException: Object reference not set to an instance of an object. at GreenBid_mobile .LoginProc.Vali dateLogin(Strin g EmailAdd, String Password) in c:\inetpub\wwwr oot\greenbid_mo bile\loginproc. asmx.cs:line 108

Here is the code:
public string ValidateLogin(s tring EmailAdd, string Password)

{

int result;

sqlCommand1.Par ameters["@usr_Email "].Value=EmailAdd ;

sqlCommand1.Par ameters["@usr_PW"].Value=Password ;


try

{

sqlCommand1.Con nection.Open();

result=(int)(sq lCommand1.Param eters["@usr_sessi on"].Value);


}

catch(Exception ex)

{

return (ex.ToString()) ;

}


sqlCommand1.Con nection.Close() ;



if(result==1)

return "Login Successfully";

else

return "Login Failed";



the error is fall on "result=(int)(s qlCommand1.Para meters["@usr_sessi on"].Value)", my database connectivity no problem.. but the problem keep on occur.

Thanks advance whoever tell me the problem.. thanks



cheers,

Wong CS