怎么利用C#向Win7系统中添加用户管理凭据

如何利用C#向Win7系统中添加用户管理凭据
如何利用C#编程实现向win7系统中添加用户管理凭据，具体请见下图


------解决方案--------------------
C#管理Windows本地用户

using System;

using System.Collections.Generic;

using System.Text;

using System.Runtime.InteropServices;

using System.Text.RegularExpressions;

using DevSDK.WinNT;

using DevSDK;

namespace DevSDK.WinNT

{

    public class NetUser:Common

    {

        //创建用户

        [DllImport("Netapi32.dll")]

        extern static int NetUserAdd([MarshalAs(UnmanagedType.LPWStr)] string sName, int Level, ref USER_INFO_1 buf, int parm_err);

        //修改用户密码

        [DllImport("Netapi32.dll")]

        extern static int NetUserChangePassword([MarshalAs(UnmanagedType.LPWStr)] string sName,[MarshalAs(UnmanagedType.LPWStr)] string UserName,[MarshalAs(UnmanagedType.LPWStr)] string OldPassword,[MarshalAs(UnmanagedType.LPWStr)] string NewPassword);

        //删除用户

        [DllImport("Netapi32.dll")]

        extern static int NetUserDel([MarshalAs(UnmanagedType.LPWStr)] string sName,[MarshalAs(UnmanagedType.LPWStr)] string UserName);

        //枚举全部用户

        [DllImport("Netapi32.dll")]

        extern static int NetUserEnum([MarshalAs(UnmanagedType.LPWStr)] string sName,int Level,int filter,out IntPtr bufPtr,int Prefmaxlen,out int Entriesread,out int Totalentries,out int Resume_Handle);

        //获取用户信息

        [DllImport("Netapi32.dll")]

        extern static int NetUserGetInfo([MarshalAs(UnmanagedType.LPWStr)] string sName,[MarshalAs(UnmanagedType.LPWStr)] string UserName,int Level,out IntPtr intptr);

        //获取用户所在本地组

        [DllImport("Netapi32.dll")]

        extern static int NetUserGetLocalGroups([MarshalAs(UnmanagedType.LPWStr)] string sName,[MarshalAs(UnmanagedType.LPWStr)] string UserName,int Level,int Flags,out IntPtr intptr,int Prefmaxlen,out int Entriesread,out int Totalentries);

        //修改用户信息

        [DllImport("Netapi32.dll")]

        extern static int NetUserSetInfo([MarshalAs(UnmanagedType.LPWStr)] string sName, [MarshalAs(UnmanagedType.LPWStr)] string UserName, int Level, ref USER_INFO_1 bufptr, int parm_err);

        //释放API

        [DllImport("Netapi32.dll")]

        extern static int NetApiBufferFree(IntPtr Buffer);

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]

        public struct LOCALGROUP_USERS_INFO_0

        {

            public string GroupName;

        }

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]

        public struct USER_INFO_1

        {

            public string sName;    //用户名

            public string sPass;    //用户密码

            public int PasswordAge; //密码级别

            public int sPriv;       //帐户类型 1

            public string sHomeDir; //用户主目录 null

            public string sComment; //用户描述

            public int sFlags;      //用户权限

            public string sScriptPath;  //登陆脚本路径 null

        }

        //枚举全部用户

        public string UserEnum()

        {