Imports System.Data.SqlTypes
Imports Microsoft.SqlServer.Server

Partial Public Class UserDefinedFunctions

    Public Const SALES_TAX As Double = 0.086

    <SqlFunction()> _
    Public Shared Function addTax(ByVal originalAmount As SqlDouble) As SqlDouble

        Dim taxAmount As SqlDouble = originalAmount * SALES_TAX

        Return originalAmount + taxAmount
    End Function
End Class

using System.Data.SqlTypes;
using Microsoft.SqlServer.Server;

public partial class UserDefinedFunctions
{
    public const double SALES_TAX = .086;

    [SqlFunction()]
    public static SqlDouble addTax(SqlDouble originalAmount)
    {
        SqlDouble taxAmount = originalAmount * SALES_TAX;

        return originalAmount + taxAmount;
    }
}

#include "stdafx.h"

#using <System.dll>
#using <System.Data.dll>
#using <System.Xml.dll>

using namespace System;
using namespace System::Data;
using namespace System::Data::Sql;
using namespace System::Data::SqlTypes;
using namespace Microsoft::SqlServer::Server;

// In order to debug your Aggregate, add the following to your debug.sql file:
//
// SELECT dbo.addTax(10)
//

public ref class UserDefinedFunctions
{
public:
    static initonly double SALES_TAX = 0.086;

    [SqlFunction()]
    static SqlDouble AddTax(SqlDouble originalAmount)
    {
        SqlDouble taxAmount = originalAmount * SALES_TAX;

        return originalAmount + taxAmount;
    }
};

SELECT dbo.addTax(10)