在不同的类上使用相同的对象，同时保留一个对象的内容

我有3类。第一个类是一个Authorize类，它有User和Pass的get/set属性。其次，添加类创建了一个新的授权类实例，并通过初始化新对象将文本框中的值赋给属性:

Authorize authorize = new Authorize();

第三个类Display试图从类Authorize中获取属性User和Pass的值。问题是我不能在这里使用authorization的新对象，因为它将清空第一个创建对象的内容。

// Can not do, because the object will be discarded and new one created.
Authorize authorize = new Authorize();

我怎样才能避免/改变这一点，这样我就可以从不同的类访问相同的对象?这是一个理论上的例子。我正在写代码，但它很长。如果需要，我可以贴在这里。但现在我离开了。

如果我说得不够清楚，请提问。

强烈推荐:)

对

——编辑——一些代码:

AddEntryWindow。

namespace Store_Passwords_and_Serial_Codes
{
    public partial class AddEntryWindow : Form
    {
        private string user, pass;
        // Initializind ArrayList to store all data needed to be added or retrived.
        static private ArrayList addedEntry = new ArrayList();
        // Initializing MainWindow form.
        MainWindow mainWindow;
        // Making authentication possible.
        // AuthenticateUser authenticateUser = new AuthenticateUser();
        EncryptDecrypt en = new EncryptDecrypt();
        // Default constructor to initialize the form.
        public AddEntryWindow()
        {
            InitializeComponent();
        }
        public AddEntryWindow(MainWindow viaParameter) : this()
        {
            mainWindow = viaParameter;
        }
        public AddEntryWindow(string user, string pass)
        {
            this.user = user;
            this.pass = pass;
        }
        private void btnAddEntry_Click(object sender, EventArgs e)
        {
            // Making sure that type is selected.
            if {}
            else
            {
                // reason why I need the content of AuthenticationUser content.
                string encrypted = en.Encrypt(stringBuilder.ToString(), user, pass);
                string decrypted = en.Decrypt(encrypted, user, pass);
                MessageBox.Show(user + pass);
                    //encrypted + Environment.NewLine + decrypted;
                /*mainWindow.ChangeTextBox = stringBuilder.ToString() + Environment.NewLine +
                    "Encrypted" + Environment.NewLine +
                    encrypted + Environment.NewLine +
                    "Decrypted" + Environment.NewLine +
                    decrypted + Environment.NewLine;
                */
            }
        }
        public static void ShowMe(AuthenticateUser au)
        {
            au.UserName = user;
            au.Password = pass;
        }
        private void cmbType_SelectedIndexChanged(object sender, EventArgs e)
        {
            // Deciding which data must be entered depending on
            // what type is selected from combo box.
            // PC
            // Web Site
            // Serial Code
        }
    }
}

authenticationwindows .cs as Add class

namespace Store_Passwords_and_Serial_Codes
{
    public partial class AuthenticationWindow : Form
    {
        public AuthenticationWindow()
        {
            InitializeComponent();
        }
        private void btnAuthenticate_Click(object sender, EventArgs e)
        {
            if (txtUserName.Text == string.Empty || txtPassword.Text == string.Empty)
            {
                MessageBox.Show("Please fill both information first.");
            }
            else
            {
                AuthenticateUser au = new AuthenticateUser();
                au.UserName = txtUserName.Text;
                au.Password = txtPassword.Text;
                AddEntryWindow.ShowMe(au);
                MessageBox.Show(au.UserName + au.Password);
                Close();
            }
        }
    }
}

不重要的AuthenticateUser.cs作为授权类

using System;
namespace Store_Passwords_and_Serial_Codes
{
    public class AuthenticateUser
    {
        private string userName, password;
        public AuthenticateUser()
        {
        }
        public AuthenticateUser(string userNamePassed, string passwordPassed)
        {
            this.userName = userNamePassed;
            this.password = passwordPassed;
        }
        public string UserName
        {
            get
            {
                return userName;
            }
            set
            {
                userName = value;
            }
        }
        public string Password
        {
            get
            {
                return password;
            }
            set
            {
                password = value;
            }
        }
    }
}