用ini文件感觉还是挺方便的

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
namespace ini
{
 /// <summary>
 /// Form1 的摘要说明。
 /// </summary>
 public class Form1 : System.Windows.Forms.Form
 { 
  private System.Windows.Forms.Button button1;
  private System.Windows.Forms.TextBox textBox1;
  private System.Windows.Forms.TextBox textBox2;
  private System.Windows.Forms.TextBox textBox3;
  private System.Windows.Forms.Button button3;
  public string database,userid,server;
  //申明INI文件的写操作函数WritePrivateProfileString()
  [ DllImport ( "kernel32" ) ]
  private static extern long WritePrivateProfileString ( string section , string key , string val , string filePath ) ;
  //申明INI文件的读操作函数GetPrivateProfileString()
  [ DllImport ( "kernel32" ) ]
  private static extern int GetPrivateProfileString ( string section ,string key , string def , StringBuilder retVal , int size , string filePath ) ;

  /// <summary>
  /// 必需的设计器变量。
  /// </summary>
  private System.ComponentModel.Container components = null;

  public Form1()
  {
   //
   // Windows 窗体设计器支持所必需的
   //
   InitializeComponent();

   //
   // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
   //
  }

  /// <summary>
  /// 清理所有正在使用的资源。
  /// </summary>
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region Windows 窗体设计器生成的代码
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
   this.button1 = new System.Windows.Forms.Button();
   this.textBox1 = new System.Windows.Forms.TextBox();
   this.textBox2 = new System.Windows.Forms.TextBox();
   this.textBox3 = new System.Windows.Forms.TextBox();
   this.button3 = new System.Windows.Forms.Button();
   this.SuspendLayout();
   //
   // button1
   //
   this.button1.Location = new System.Drawing.Point(176, 16);
   this.button1.Name = "button1";
   this.button1.Size = new System.Drawing.Size(88, 24);
   this.button1.TabIndex = 0;
   this.button1.Text = "写ini文件";
   this.button1.Click += new System.EventHandler(this.button1_Click);
   //
   // textBox1
   //
   this.textBox1.Location = new System.Drawing.Point(40, 8);
   this.textBox1.Name = "textBox1";
   this.textBox1.Size = new System.Drawing.Size(96, 21);
   this.textBox1.TabIndex = 1;
   this.textBox1.Text = "";
   //
   // textBox2
   //