C thumbnail multi path multi format saved instance

using System;
using System.Drawing;
namespace PubLib
{
 /// <summary>
 /// PicShow  A summary of. 
 /// </summary>
 public class PicShow
 {
  public PicShow()
  {
   //
   // TODO:  Add the constructor logic here 
   //
  }
  // Find out if the image file exists 
  public static string ViewPIC(string PicPath, string PicName)
  {
   string BigPic = Checks.HM_PHYSICSROOT + "MoviePIC/"+Checks.HM_PICROOTPATH+"/"+PicName;
   string SmlPic = Checks.HM_PHYSICSROOT + "MoviePIC/"+PicPath+"/"+PicName;
   if (null==PicName || false==System.IO.File.Exists(BigPic)) // The large image name is empty or the file does not exist 
    PicName = "nopic.jpg";
   string OutPic = "MoviePIC/"+PicPath+"/"+PicName;
   if (!System.IO.File.Exists(SmlPic)) // The lookup thumbnail does not exist 
   {
    CreatePIC(PicPath, PicName);
    return OutPic;
   }
   return OutPic;
  }
  // Create thumbnails 
  public static void CreatePIC(string PicPath, string PicName)
  {
   int iWidth,iHeight;
   if (null!=PicPath && PicPath.IndexOf("X")>1)
   {
    char[] spliter = {X};
    string[] aPicPath = PicPath.Split(spliter,2);
    iWidth  = Int32.Parse(aPicPath[0]);
    iHeight = Int32.Parse(aPicPath[1]);
    string BigPic = Checks.HM_PHYSICSROOT + "MoviePIC/"+Checks.HM_PICROOTPATH+"/"+PicName;
    string SmlPic = Checks.HM_PHYSICSROOT + "MoviePIC/"+PicPath+"/"+PicName;
    Image BigImage = Image.FromFile(BigPic);
    Image SmlImage = BigImage.GetThumbnailImage(iWidth,iHeight,null,new System.IntPtr());
    SmlImage.Save(SmlPic,System.Drawing.Imaging.ImageFormat.Jpeg);
    BigImage.Dispose();
    SmlImage.Dispose();
   }
  }
 }
}

Checks.HM_PHYSICSROOT is a static variable which is the root of the system. How do you get it? It's actually pretty easy you could just write a path to it. It's not flexible but it's simple. Here's what I did
public static string HM_PHYSICSROOT = AppDomain.CurrentDomain.BaseDirectory;
(in fact, it is also simple: ~)
Multiple paths, which is a little scary, you can specify one path when you generate the thumbnail. This is the parameter PicPath that you need to specify by hand. In multi-format terms, it can be resized. My method is that the path is the size, such as 200*300 image path is called 200X300 hey hey, of course, to specify a picture of the original path, or from there to get the image to generate thumbnail ah. This Checks.HM_PICROOTPATH can only be written by hand. I'm not going to change it once I write it.