/// <summary>         /// 获取Excel文件        /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void button1_Click(object sender, EventArgs e)         {             OpenFileDialog dlg = new OpenFileDialog();             dlg.Filter = "Excel文件(*.xls)|*.xls";             if (dlg.ShowDialog() == DialogResult.OK)             {                 string filePath = dlg.FileName;                 this.textBox1.Text = filePath;             }         }         /// <summary>         /// 导入Excel文件        /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void button2_Click(object sender, EventArgs e)         {             if (textBox1.Text.Length == 0)             {                 MessageBox.Show("请选择导入数据的Execl文件");             }             else             {                 try                 {                     OleDbConnectionStringBuilder connectStringBuilder = new OleDbConnectionStringBuilder();                     connectStringBuilder.DataSource = this.textBox1.Text.Trim();                     connectStringBuilder.Provider = "Microsoft.Jet.OLEDB.4.0";                     connectStringBuilder.Add("Extended Properties", "Excel 8.0");                     using (OleDbConnection cn = new OleDbConnection(connectStringBuilder.ConnectionString))                     {                         DataSet ds = new DataSet();                         string sql = "Select * from [Sheet1$]";                         OleDbCommand cmdLiming = new OleDbCommand(sql, cn);                         cn.Open();                         using (OleDbDataReader drLiming = cmdLiming.ExecuteReader())                         {                             ds.Load(drLiming, LoadOption.OverwriteChanges, new string[] { "Sheet1" });                             DataTable dt = ds.Tables["Sheet1"];                             if (dt.Rows.Count > 0)                             {                                 for (int i = 0; i < dt.Rows.Count; i++)                                 {                                     //写入数据库数据                                    string MySql = "insert into ClientInfo values(‘"+dt.Rows[i]["姓名"].ToString()+"‘,‘"+dt.Rows[i]["姓名"].ToString()                                         +"‘,‘0‘,‘"+dt.Rows[i]["备注"].ToString()+"‘,‘0‘,‘"+i.ToString()+"‘)";                                     new DataAccess().SQLExecute(MySql);                                 }                                 MessageBox.Show("数据导入成功！");                             }                             else                             {                                 MessageBox.Show("请检查你的Excel中是否存在数据");                             }                         }                     }                 }                 catch (Exception ex)                 {                     MessageBox.Show(ex.ToString());                 }             }         } /// <summary>         /// 数据操作通用类        /// </summary>         /// <param name="sql"></param>         /// <returns></returns>         public bool SQLExecute(string sql)         {             try             {                 OleDbConnection conn = new OleDbConnection(CONNECT_STRING);                 conn.Open();                 OleDbCommand comm = new  OleDbCommand ();                 comm.Connection = conn;                 comm.CommandText = sql;                 comm.ExecuteNonQuery();                 comm.Connection.Close();                 conn.Close();                 return true;             }             catch             {                 return false;             }         }