/// MBD compact method (c) 2004 Alexander Youmashev
/// !!IMPORTANT!!
/// !make sure there＇s no open connections
/// to your db before calling this method!
/// !!IMPORTANT!!
/// 
/// connection string to your db
/// FULL name
/// of an MDB file you want to compress.
public static void CompactAccessDB(string connectionString, string mdwfilename)
{
    object[] oParams;

    //create an inctance of a Jet Replication Object
    object objJRO =
    Activator.CreateInstance(Type.GetTypeFromProgID("JRO.JetEngine"));

    //filling Parameters array
    //cnahge "Jet OLEDB:Engine Type=5" to an appropriate value
    // or leave it as is if you db is JET4X format (access 2000,2002)
    //(yes, jetengine5 is for JET4X, no misprint here)

    oParams = new object[] { 
connectionString,
"Provider=Microsoft.Jet.OLEDB.4.0;Data" + 
" Source=C:\\tempdb.mdb;Jet OLEDB:Engine Type=5"};

    //invoke a CompactDatabase method of a JRO object
    //pass Parameters array

    objJRO.GetType().InvokeMember("CompactDatabase",
    System.Reflection.BindingFlags.InvokeMethod,
    null,
    objJRO,
    oParams);

    //database is compacted now
    //to a new file C:\\tempdb.mdw
    //let＇s copy it over an old one and delete it

    System.IO.File.Delete(mdwfilename);
    System.IO.File.Move("C:\\tempdb.mdb", mdwfilename);
    //clean up (just in case)
    System.Runtime.InteropServices.Marshal.ReleaseComObject(objJRO);
    objJRO = null;
}

using System;
using System.IO;
using ADOX; //该命名空间包含创建ACCESS的类(方法)--解决方案 ==> 引用 ==> 添加引用 ==> 游览找到.dll
using JRO; //该命名空间包含压缩ACCESS的类(方法)

public class Access
{
    ///根据指定的文件名称创建ACCESS数据库
    ///mdbPath:要创件的ACCESS绝对路径
    public void Create(string mdbPath)
    {
        if (File.Exists(mdbPath)) //检查数据库是否已存在
        {
            throw new Exception("目标数据库已存在,无法创建");
        }
        // 可以加上密码,这样创建后的数据库必须输入密码后才能打开