Windows Mobile 开发：创建数据库和表(转载别人)

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();
         }
         //创建数据库的表
         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("创建数据库成功！");
                 return true;
             }
             catch (Exception ex)
             {
                 MessageBox.Show("创建数据库失败" + ex.ToString().Substring(1, 60));
                 return false;
             }
        
        
        
         }

         private void button1_Click(object sender, EventArgs e)
         {
           //创建数据库
             try
             {
                 if ( File.Exists("mysdf.sdf"))
                 {
                     MessageBox.Show("数据库已经存在");
                
                 }
                 else
                 {
                     SqlCeEngine eng = new SqlCeEngine("DataSource=mysdf.sdf");
                     eng.CreateDatabase();
                     eng.Dispose();
                     MessageBox.Show("创建数据库成功");
                
　　　　             
                 }
                 Boolean rtu;
                 rtu = CreateTable();
                 if (rtu = false)
                 {
                     MessageBox.Show("数据表已经存在！");

                 }
                 else
                 {
                     MessageBox.Show("创建数据表成功！");
                
                
                 }
                
             }
             catch(Exception ex)
             {
                 MessageBox.Show("创建数据库失败"+ ex.ToString().Substring(1,60));
            
             }

　　　  

         }

         
     }
}