Author: Tomas Rutkauskas

I have a form with a stringgrid on it. I use the grid to display some data 
regarding a certain part. How do I clear the grid, that still holds data from the 
first display, before I display data of a different part?

Answer:

You have to loop over the rows or cols or even cells (depends on how the grid is 
layed out):

1   with StringGrid1 do
2   begin
3     perform(WM_SETREDRAW, 0, 0); {block visual updates}
4     try
5       for i := fixedRows to Rowcount - 1 do
6         Rows[i].Clear;
7     finally
8       perform(WM_SETREDRAW, 1, 0);
9       invalidate;
10    end;
11  end;


Since this wipes complete rows it would not be suitable if you have a fixed column on the left that should be preserved, for example.