my comprehension about the "SetVirtualMode"

   According to the explainment  to freediver211   ,  I think  the  "VirtualMode" is just a method to copy the "data " from the database to the "Screen "—— it is not need to get the data to the  "ReportControl ", and  when needed , it can get the data repeatly from the  database,  for instance ,   in your demo , though you were not get a data form the "third part ".

 

      but  there could be some prolbem by comparing to other grid controls . In your demo , your printf the grid like this:  in a row ,  print the column from the left to the right , when a row has finished ,begin a new row ,   print the column from left to right, …………………… 。 The problem is ,in you function that do above ,  the print sequence has been "defined" ,   how can I  get/set  "the one" among the table ???    

      then how to change "the one" among the table ???    ?????