Error when retrieving the values of output parameter of a stored procedure

Hi,

I have a stored procedure defined as follows to check the existence of the duplicate Email:

USE [SQL2008_850994_onebizness]
GO
/****** Object:  StoredProcedure [dbo].[EmailExists]    Script Date: 04/07/2013 15:14:22 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
 
ALTER PROCEDURE [dbo].[EmailExists]
@EmailID Nvarchar(50),
@Success int output,
@msg varchar(50) output  
 
AS
BEGIN
IF EXISTS(SELECT 1 FROM dbo.Membership WHERE EmailId = @emailID)
    OR EXISTS(SELECT 1 FROM dbo.Allocation where ResourceEmail=@emailID)
begin
set @Success=6
set @msg='Duplicate Email found. Please try again.'      
--Insert the records in the database
end
END

--------------------------------------------------------------

I am retrieving the value of the success in a C# code as follows:

int returnVal = int.Parse(myCOmmand.Parameters["@Success"].ToString());


I am getting the error message "Input values are not in the correct format".

Can someone please let me know what is causing the error?

Thanks for the help.
Yagya