frmDataBackup.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using PMS.PMSClass;
using System.Data.SqlClient;
using System.Collections;
using System.IO;
namespace PMS
{
    public partial class frmDataBackup : Form
    {
        public frmDataBackup()
        {
            InitializeComponent();
        }
        public string strg;
        private void button1_Click(object sender, EventArgs e)//备份数据库
        {
            try
            {
                strg = Application.StartupPath.ToString();
                strg = strg.Substring(0, strg.LastIndexOf("\\"));
                strg = strg.Substring(0, strg.LastIndexOf("\\"));
                strg += @"\Backup";
                string sqltxt = @"BACKUP DATABASE db_PMS TO Disk='" + strg + "\\PMS.bak" + "'";
                if (File.Exists(strg + "\\PMS.bak"))
                {
                    File.Delete(strg + "\\PMS.bak");
                    SqlConnection conn = DBConnection.MyConnection();
                    conn.Open();
                    SqlCommand cmd = new SqlCommand(sqltxt, conn);
                    cmd.ExecuteNonQuery();
                    conn.Dispose();
                    if (MessageBox.Show("备份成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation) == DialogResult.OK)
                    {
                        this.Close();
                    }
                }
                else
                {
                    SqlConnection conn = DBConnection.MyConnection();
                    conn.Open();
                    SqlCommand cmd = new SqlCommand(sqltxt, conn);
                    cmd.ExecuteNonQuery();
                    conn.Dispose();
                    if (MessageBox.Show("备份成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation) == DialogResult.OK)
                    {
                        this.Close();
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString(),"提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
            }
        }