INI文件格式如下： 
[Database] 
server=wlq 
database=mydatabase 
uid=sa 
pwd=123456

說明：（有4個(gè)key) 
Section為：Database 
Key為：server database uid pwd

/***************代碼******************/ 
using System; 
using System.IO; 
using System.Runtime.InteropServices; 
using System.Text;

namespace Sx_Mdi 
{

/// <summary> 
/// Summary description for Class1. 
/// </summary> 
public class IniFile 
{ 
//文件INI名稱 
public string Path;

////聲明讀寫INI文件的API函數(shù) 
[DllImport("kernel32")]

private static extern long WritePrivateProfileString(string section,string key,string val,string filePath);

[DllImport("kernel32")]

private static extern int GetPrivateProfileString(string section,string key,string def,StringBuilder retVal,int size,string filePath);

//類的構(gòu)造函數(shù)，傳遞INI文件名 
public IniFile(string inipath) 
{ 
// 
// TODO: Add constructor logic here 
// 
Path = inipath; 
}

//寫INI文件 
public void IniWriteValue(string Section,string Key,string Value) 
{ 
WritePrivateProfileString(Section,Key,Value,this.Path);

}

//讀取INI文件指定 
public string IniReadValue(string Section,string Key) 
{ 
StringBuilder temp = new StringBuilder(255); 
int i = GetPrivateProfileString(Section,Key,"",temp,255,this.Path); 
return temp.ToString();

}

} 
}

操作范例：

public static SqlConnection MyConnection() 
{ 
string sPath; 
string ServerName,userId,sPwd,DataName;

sPath = GetPath(); 
IniFile ini = new IniFile(sPath); 
ServerName = ini.IniReadValue ("Database","server"); 
userId = ini.IniReadValue ("Database","uid"); 
sPwd = ini.IniReadValue ("Database","pwd"); 
DataName = ini.IniReadValue ("Database","database"); 
string strSql = "server =" + ServerName+";uid ="+ userId +";pwd =;database ="+ DataName; 
　　　 SqlConnection myConn=new SqlConnection(strSql); 
　　　 return myConn; 
}

/***************代碼******************/