A C# class that exposes the INI file handling functions from Kernal32.dll

Ini.cs

using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;

namespace Ini
{
	/// <summary>
	/// Create a New INI file to store or load data
	/// </summary>
	public class IniFile
	{
		public string path;

		[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);

		/// <summary>
		/// INIFile Constructor.
		/// </summary>
		/// <param name="INIPath"></param>
		public IniFile(string INIPath)
		{
			path = INIPath;
		}
		/// <summary>
		/// Write Data to the INI File
		/// </summary>
		/// <param name="Section"></param>
		/// Section name
		/// <param name="Key"></param>
		/// Key Name
		/// <param name="Value"></param>
		/// Value Name
		public void IniWriteValue(string Section,string Key,string Value)
		{
			WritePrivateProfileString(Section,Key,Value,this.path);
		}
		
		/// <summary>
		/// Read Data Value From the Ini File
		/// </summary>
		/// <param name="Section"></param>
		/// <param name="Key"></param>
		/// <param name="Path"></param>
		/// <returns></returns>
		public string IniReadValue(string Section,string Key)
		{
			StringBuilder temp = new StringBuilder(255);
			int i = GetPrivateProfileString(Section,Key,"",temp,255,this.path);
			return temp.ToString();

		}
	}
}

Introduction
I created a C# class Ini which exposes 2 functions from KERNEL32.dll. These functions are: WritePrivateProfileString and GetPrivateProfileString

Namespaces you will need:

System.Runtime.InteropServices

and

System.Text

Using the class
Steps to use the Ini class:

In your project namespace definition add

using INI;

Create a INIFile like this

INIFile ini = new INIFile("C:\test.ini");

Use IniWriteValue to write a new value to a specific key in a section or use IniReadValue to read a value FROM a key in a specific Section.
That's all. It's very easy in C# to include API functions in your class(es).