public ServerDataSource(CommandDispatcher dispatcher, string fileName, string datasetname, string sheetname = "")
{
this.Dispatcher = dispatcher;
this.FileNameWithPath = fileName;//.ToLower();
this.FileName = System.IO.Path.GetFileName(FileNameWithPath);//filename
this.SheetName = sheetname;//29Apr2015
this.Name = datasetname;//dataset name assigned by application to the opened dataset(.sav) file
this.Extension = Path.GetExtension(fileName).Replace('.', ' ').Trim(); //fileName.Substring(fileName.LastIndexOf(".")+1);
}