窗口问题,麻烦高手帮我看看,急....
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace Lg
{
public partial class Login : Form
{
// public static bool blCanLogin = false;
public static string strUser = " ";
private DataSet ds = new DataSet();
private DataTable myTable;
private DataRow myRow;
private string sendStrSQL = "select * from LoginPwd ";

public Login()
{
InitializeComponent();

DataBase db = new DataBase();
string sendTableName = "LoginPwd ";
this.ds = db.SelectDataBase(sendStrSQL,sendTableName);
this.myTable = ds.Tables[0];
}

private void button2_Click(object sender, EventArgs e)
{
Application.Exit();
}

private void button1_Click(object sender, EventArgs e)
{
for (int i = 0; i < myTable.Rows.Count; i++)
{
this.myRow = myTable.Rows[i];
if (myRow[0].ToString().Trim() == this.textBox1.Text.ToString().Trim() && myRow[1].ToString().Trim() == this.textBox2.Text.ToString().Trim())
{
MessageBox.Show( "legal user ");

Form MainUI = new Form(); /////
MainUI.Show(); /////
return;
}
else
{
MessageBox.Show( "illegal user ");
return;
}
}


}
}
}


当我打开主窗口后,我应该怎么把密码验证那个窗口关闭啊,我用THIS.CLOSE()全部窗口都关闭了,我记得我打开打开窗口的时候,好像旧的窗口会自动关闭的,

[解决办法]
把 Main() 中的 Application.Run(new Login()); 改成 Application.Run(new MainUI());

在 MainUI Load 事件中加载 Login...ShowDialog...验证时 Hide 验证后 Close...

因为主线程窗体 Close 会结束程序...新手常见问题...

ps:窗体命名不怎么规范...
[解决办法]
这个应该启动主窗口,登陆窗口只是在主窗口的构造函数中的直接New对象,然后登陆窗口以模式窗口打开,登陆成功就this.Close();失败就Application.Exit();
[解决办法]
登陆一般这样处理：登陆通过的时候返回DialogResult.ok,取消的返回DialogResult.Cancel.密码错误的时候返回DialogResult.None

例：
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
frmLogin fl = new frmLogin();
fl.ShowDialog();
if (fl.DialogResult == DialogResult.Cancel)
{
Application.Exit();
}
else
{
Application.Run(new frmMain());
}
}