Unable To Extract From Stored Procedure

 hi everyone
ive written a stored procedure which returns a value depending on the i/p parameter
ive executed it in the object browser
but i cant extract it from the stored proc to the front end
 
create procedure  checking ( @username varchar(20), @password varchar(20) ,@result int out)
as

if @username ='admin'
set @result = 1
else
set @result = 0
return @result


GO

and this is what i wrote in the code behind
SqlCommand check = new SqlCommand("checking",con);//checking is the stored procedure
            check.CommandType = CommandType.StoredProcedure;
            check.Parameters.Add(new SqlParameter("@username", SqlDbType.VarChar)).Value = TxtUsername.Value;
            check.Parameters.Add (new SqlParameter("@password", SqlDbType.VarChar)).Value = TxtPassword.Value;
            check.Parameters.Add(new SqlParameter("@result", SqlDbType.Int)).Value = 0;
int status = ( Convert.toint32 )check.executenonquery();// the line which is prolly causing the error , can u tell me what should be written here?
 
 
the status returns -1