How to read and write the INI file in C #

Write INI file
[DllImport ("kernel32")]
private static extern bool WritePrivateProfileString (string section, string key, String val, string filePath);
Read INI file (character
[DllImport ("kernel32")]
private static extern int getprivateprofilestring (string section, String key, String Def, StringBuilder retVal, int si Ze, string filePath);

Read the INI file (number
[DllImport ("kernel32")]
private static extern int Getprivateprofileint (string section, string key, int def, string filePath);

//////////////////////////////////////////////////////////////
Using System;
Using System.IO;
Using System.Runtime.InteropServices;
Using System.Text;

Namespace Echoncomponentlibrary
{
<summary>
Summary description of the IniFile.
</summary>
public class IniFile
{
private string Ffilename;

[DllImport ("kernel32")]
private static extern int Getprivateprofileint (
String Lpappname,
String Lpkeyname,
int Ndefault,
String lpFileName
);
[DllImport ("kernel32")]
private static extern int GetPrivateProfileString (
String Lpappname,
String Lpkeyname,
String Lpdefault,
StringBuilder lpreturnedstring,
int nsize,
String lpFileName
);
[DllImport ("kernel32")]
private static extern bool WritePrivateProfileString (
String Lpappname,
String Lpkeyname,
String lpstring,
String lpFileName
);

Public IniFile (string filename)
{
Ffilename = filename;
}
public int ReadInt (string section,string key,int def)
{
Return Getprivateprofileint (Section,key,def,ffilename);
}
public string ReadString (string section,string key,string def)
{
StringBuilder temp = new StringBuilder (1024);
GetPrivateProfileString (Section,key,def,temp,1024,ffilename);
Return temp. ToString ();
}
public void Writeint (string section,string key,int ival)
{
WritePrivateProfileString (Section,key,ival.tostring (), ffilename);
}
public void WriteString (string section,string key,string strval)
{
WritePrivateProfileString (Section,key,strval,ffilename);
}
public void Delkey (String section,string key)
{
WritePrivateProfileString (Section,key,null,ffilename);
}
public void Delsection (string section)
{
WritePrivateProfileString (Section,null,null,ffilename);
}

}
}