Windows Mobile 開發：建立資料庫和表

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Data.SqlServerCe;
using System.Net;
using System.IO;

namespace WinAppGrid
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        //建立資料庫的表
        private Boolean CreateTable()
        {
            try
            {
                SqlCeConnection myconn = new SqlCeConnection("DataSource=mysdf.sdf");
                SqlCeCommand com = new SqlCeCommand("create table PC (PCNO NVarChar(10) primary key,XH NVarChar(10) NOT NULL,WERKS NVarChar(4) NOT NULL,PC_DATE NVarChar(10))");
                myconn.Open();
                com.Connection = myconn;
                com.ExecuteNonQuery();
                myconn.Close();
                MessageBox.Show("建立資料庫成功！");
                return true;
            }
            catch (Exception ex)
            {
                MessageBox.Show("建立資料庫失敗" + ex.ToString().Substring(1, 60));
                return false;
            }
       
       
       
        }

 

        private void button1_Click(object sender, EventArgs e)
        {
          //建立資料庫
            try
            {
                if ( File.Exists("mysdf.sdf"))
                {
                    MessageBox.Show("資料庫已經存在");
               
                }
                else
                {
                    SqlCeEngine eng = new SqlCeEngine("DataSource=mysdf.sdf");
                    eng.CreateDatabase();
                    eng.Dispose();
                    MessageBox.Show("建立資料庫成功");
               
　　　　            
                }
                Boolean rtu;
                rtu = CreateTable();
                if (rtu = false)
                {
                    MessageBox.Show("資料表已經存在！");

                }
                else
                {
                    MessageBox.Show("建立資料表成功！");
               
               
                }
               
            }
            catch(Exception ex)
            {
                MessageBox.Show("建立資料庫失敗"+ ex.ToString().Substring(1,60));
           
            }

 　　　 

        }

        
    }
}