SQLCLR EBCDIC (日本語カタカナ)に変換する

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

public partial class UserDefinedFunctions
{
    /// <summary>
    /// 20290 IBM290 IBM EBCDIC (日本語カタカナ)
    /// </summary>
    /// <param name="target">文字列</param>
    /// <param name="length">文字数</param>
    /// <returns>byte[]</returns>
    [Microsoft.SqlServer.Server.SqlFunction]
    public static byte[] EBCDIC(string target, int length)
    {
        string wTarget = target.PadRight(length, ' ');

        Encoding encoding = Encoding.GetEncoding(20290);

        byte[] bytes = encoding.GetBytes(wTarget);
        return bytes;
    }
};