frmlock.cs

企业短信群发系统

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace SMS.Forms
{
    public partial class frmLock : Form
    {
        private static frmLock frmlock;//声明一个私有变量用来保存唯一的窗体实例
        public frmLock()
        {
            InitializeComponent();
        }
        
        //声明一个静态方法，此方法是用来判断何时实例化窗体
        public static frmLock Instance()
        {
            if (frmlock == null)
                frmlock = new frmLock();
            return frmlock;
        }
        private void pictureBox1_Click(object sender, EventArgs e)
        {
            OleDbConnection conn = BaseClass.ConnClass.DataConn();
            conn.Open();
            OleDbCommand cmd = new OleDbCommand("select count(*) from tb_Admin where AdminUserPwd='" + textBox1.Text.Trim() + "'", conn);
            int i = Convert.ToInt32(cmd.ExecuteScalar());
            if (i > 0)
            {
                frmlock.Dispose(true);
                frmlock = null;
                this.Close();
            }
            else
            {
                if (MessageBox.Show("密码错误", "警告", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning) == DialogResult.OK)
                {
                    textBox1.Text = "";
                    textBox1.Focus();
                }

            }
        }
    }
}