显式转换int到SqlInt32

using System;
using System.Diagnostics;
using System.Collections;
using System.Collections.Generic;
using System.Data.SqlTypes;
using Microsoft.SqlServer.Server;

public partial class UserDefinedFunctions
{
    [SqlFunction()]
    static public int RarFiles(SqlString TARGET, SqlString SRC, SqlString SIZE)
    {
        ProcessStartInfo p = new ProcessStartInfo();
        p.FileName = @"C:\Program Files\WinRAR\rar.exe";
        p.Arguments = String.Format("a -cfg- -ep1 -idcdp -m5 -r -s -v{0} {1} {2}", SIZE, TARGET, SRC);
        Process x = Process.Start(p);
        SqlInt32 res = x.ExitCode;
        return res;
   }
}