把下面的代码改动一下，就可以在你的程序中使用，当然 
别忘记加上名字空间哦。 

以下内容为程序代码：
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名称 
public string Path; 

////声明读写INI文件的API函数 
[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); 


//类的构造函数，传递INI文件名 
public IniFile(string inipath) 
{ 
// 
// TODO: Add constructor logic here 
// 
Path = inipath; 
} 

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

} 

//读取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; 
}