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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();

        }

    }
}

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using Ini;

namespace IniTest
{


/// <summary>
  /// Summary description for Form1.
  /// </summary>
  public class Form1 : System.Windows.Forms.Form
  {
    private System.Windows.Forms.TextBox name;
    private System.Windows.Forms.TextBox lname;
    /// <summary>
    /// Required designer variable.
    /// </summary>
    private System.ComponentModel.Container components = null;

    public Form1()
    {
      //
      // Required for Windows Form Designer support
      //
      InitializeComponent();

      //
      // TODO: Add any constructor code after InitializeComponent call
      //
    }

    /// <summary>
    /// Clean up any resources being used.
    /// </summary>
    protected override void Dispose( bool disposing )
    {
      if( disposing )
      {
        if (components != null) 
        {
          components.Dispose();
        }
      }
      base.Dispose( disposing );
    }

    #region Windows Form Designer generated code
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
      this.name = new System.Windows.Forms.TextBox();
      this.lname = new System.Windows.Forms.TextBox();
      this.SuspendLayout();
      // 
      // name
      // 
      this.name.Location = new System.Drawing.Point(8, 8);
      this.name.Name = "name";
      this.name.Size = new System.Drawing.Size(184, 20);
      this.name.TabIndex = 0;
      this.name.Text = "Name";
      // 
      // lname
      // 
      this.lname.Location = new System.Drawing.Point(8, 40);
      this.lname.Name = "lname";
      this.lname.Size = new System.Drawing.Size(184, 20);
      this.lname.TabIndex = 1;
      this.lname.Text = "Last Name";
      // 
      // Form1
      // 
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(208, 70);
      this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                      this.lname,
                                      this.name});
      this.Name = "Form1";
      this.Text = "Form1";
      this.Closing += new System.ComponentModel.CancelEventHandler(this.Form1_Closing);
      this.Load += new System.EventHandler(this.Form1_Load);
      this.ResumeLayout(false);

    }
    #endregion

    /// <summary>
    /// The main entry point for the application.
    /// </summary>
    [STAThread]
    static void Main() 
    {
      Application.Run(new Form1());
    }

    private void Form1_Closing(object sender, System.ComponentModel.CancelEventArgs e)
    {
      IniFile ini = new IniFile("C:\\test.ini");
      ini.IniWriteValue("Info","Name",name.Text);
      ini.IniWriteValue("Info","LastName",lname.Text);
    }
    private void Form1_Load(object sender, System.EventArgs e)
    {
      IniFile ini = new IniFile("C:\\test.ini");
      name.Text= ini.IniReadValue("Info","Name");
      lname.Text = ini.IniReadValue("Info","LastName");
    }
  }
}                    

1:

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

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IniFile ini = new IniFile(@"test.ini");                    

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IniFile ini = new IniFile (Application.StartupPath + "\\test.ini");