private void SaveTileToDisc(int tileX, int tileY, int zoom, string tableName, Bitmap bmp)
 {
     if (bmp != null && bmp.Tag == null)
     {
         RasterFileSystem rasterFS = new RasterFileSystem(SqlServerModel.GetSqlDatabaseName(this.GetConnectionString()), tableName);
         rasterFS.SaveTileBitmap(bmp, ImageFormat.Png, zoom, tileX, tileY);
     }
 }
        private Bitmap LoadTileFromDisc(int tileX, int tileY, int zoom, string tableName)
        {
            RasterFileSystem rasterFS = new RasterFileSystem(SqlServerModel.GetSqlDatabaseName(this.GetConnectionString()), tableName);

            return(rasterFS.GetTileBitmap(zoom, tileX, tileY));
        }