C# ICON

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Bright.HIS.Data
{
    public class Icon
    {
        #region Win32 API

        [System.Runtime.InteropServices.DllImport("shell32.dll", EntryPoint = "ExtractAssociatedIcon")]
        private static extern IntPtr ExtractAssociatedIconA(IntPtr hInst,[System.Runtime.InteropServices.MarshalAs(
   System.Runtime.InteropServices.UnmanagedType.LPStr)] string lpIconPath,ref int lpiIcon);

        [System.Runtime.InteropServices.DllImport("shell32.dll", EntryPoint = "ExtractIcon")]
        private static extern IntPtr ExtractIconA(IntPtr hInst,[System.Runtime.InteropServices.MarshalAs(
                 System.Runtime.InteropServices.UnmanagedType.LPStr)] string lpszExeFileName,int nIconIndex);

        private static IntPtr hInst;

        #endregion

        #region ICON

        public static System.Drawing.Icon ExtractIcon(string fileName, int index)
        {
            if (System.IO.File.Exists(fileName) || System.IO.Directory.Exists(fileName))
            {
                System.IntPtr hIcon;

                hIcon = ExtractIconA(hInst, fileName, -1);

                if (hIcon.Equals(IntPtr.Zero))
                {
                    return ExtractAssociatedIcon(fileName);
                }
                else
                {
                    int numOfIcons = hIcon.ToInt32();

                    if (0 <= index && index < numOfIcons)
                    {
                        hIcon = ExtractIconA(hInst, fileName, index);

                        if (!hIcon.Equals(IntPtr.Zero))
                        {
                            return System.Drawing.Icon.FromHandle(hIcon);
                        }
                        else
                        {
                            return null;
                        }
                    }
                    else
                    {
                        return null;
                    }
                }
            }
            else
            {
                return null;
            }
        }

        public static System.Drawing.Icon ExtractAssociatedIcon(string fileName)
        {
            if (System.IO.File.Exists(fileName) || System.IO.Directory.Exists(fileName))
            {
                int i = 0;

                IntPtr hIcon = ExtractAssociatedIconA(hInst, fileName, ref i);

                if (!hIcon.Equals(IntPtr.Zero))
                {
                    return System.Drawing.Icon.FromHandle(hIcon);
                }
                else
                {
                    return null;
                }
            }
            else
            {
                return null;
            }
        }

        public static System.Drawing.Image GetIconFromFile(string aFilePath)
        {
            System.Drawing.Icon img = UICommon.Icon.ExtractIcon(aFilePath.ToString(), 0);
            return img.ToBitmap();
        }

        public static System.Drawing.Image GetIconByMemoryStream(string aFilePath)
        {
            System.Drawing.Image img = new System.Drawing.Bitmap(aFilePath.ToString());
            System.IO.MemoryStream mStream = new System.IO.MemoryStream();
            img.Save(mStream, System.Drawing.Imaging.ImageFormat.Png);
            System.Drawing.Image IconShow = System.Drawing.Image.FromStream(mStream);
            mStream.Close();
            img.Dispose();
            return IconShow;
        }

        public static System.Drawing.Image GetImgFromPic(string aFilePath)
        {
            System.Drawing.Image img = new System.Drawing.Bitmap(aFilePath.ToString());
            return img;
        }

        public static System.Drawing.Icon GetIconFromPic(string aFilePath)
        {
            System.Drawing.Image img = new System.Drawing.Bitmap(aFilePath.ToString());
            System.IO.MemoryStream mStream = new System.IO.MemoryStream();
            img.Save(mStream, System.Drawing.Imaging.ImageFormat.Gif);
            System.Drawing.Icon IconShow = System.Drawing.Icon.FromHandle(new System.Drawing.Bitmap(mStream).GetHicon());
            mStream.Close();
            img.Dispose();
            return IconShow;
        }
        #endregion
    }
}