[Serializable]
    public class wndStt {
       public int x;
       public int y;
       public int width;
       public int height;
       public wndStt(){
           x = 20;
           y = 10;
           width = 400;
           height = 300;
       }
       public virtual void set(Form f){
          f.Size = new System.Drawing.Size(width, height);
          f.Location = new Point(x, y);
       }
       public virtual void get(Form f){
           x = f.Location.X;
           y = f.Location.Y;
           width  = f.Size.Width;
           height = f.Size.Height;
       }

       static public  void restore<T>(ref T tthis, string FlNm, llbBox   l){
          if (File.Exists(FlNm) ){      // иногда при сбоях записи
                                          // длина файла оказывается 0
            FileInfo someFileInfo = new FileInfo(FlNm);
  
            if (someFileInfo.Length !=0){ 
    
               try {
                 using (FileStream fs = new FileStream(FlNm, FileMode.Open))
                 {
                     XmlSerializer formatter = new XmlSerializer(tthis.GetType());
                     l.WriteLine(IMPORTANCELEVEL.Warning, "Deser1");
                     tthis = (T) formatter.Deserialize(fs);

                 }
               }

               }                 
               catch (Exception ex){
                 l.WriteException(ex, "Configuration was skipped 2");
               }                 

             }
             else
               File.Delete(FlNm);
          }
       }

       static public  void save<T>(T tthis, string FlNm, llbBox   l){

         try {
           using (FileStream fs = new FileStream(FlNm, FileMode.Create))
           {
               XmlSerializer formatter = new XmlSerializer(tthis.GetType());
               formatter.Serialize(fs, tthis);
           }
         }
               
         catch (Exception ex){
           l.WriteException(ex, "Some problem with configuration saving");
         }                 

      }
    }