Index was outside the bounds of the array (System.Byte to tinyint)

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I'm stuck I have SP (dbo.getbalance) which returns multiple recordsets. Actually 2 recoredsets

and one of the SP's parameters is TINYINT ( lang_type ), which as i know in c# is System.Byte, but when I'm trying to pass this parameter I get an error: "Index was outside the bounds of the array"

Here is my code

public class Balance : DataClasses1DataContext
    {
        [Function(Name = "dbo.getbalance")]
        [ResultType(typeof(BalanceUserList))]
        [ResultType(typeof(UserBalanceAccount))]
        public IMultipleResults GetUserBalance(int iclient_no, int session_id, DateTime? bal_date)
        {
            System.Byte lang_type = 0;// Helper.GetLanguage();
            IExecuteResult result = this.ExecuteMethodCall(this,
                ((MethodInfo)(MethodInfo.GetCurrentMethod())),
                iclient_no, session_id, bal_date, lang_type );
            return (IMultipleResults)(result.ReturnValue);
        }

    }

and SP's parameters

@iclient_no         INT,
@session_id         INT,
@bal_date           SMALLDATETIME ,
@lang_type          TINYINT = NULL

What I'm doing wrong?

asked 45 secs ago

Jaztingo

48