GRIDSTYLE system variable
Function Description:
The GRIDSTYLE system variable is used to control the grid display as points or lines.
Type : Integer 
Saved in : Registry 
Initial value : 0 
Range : 0 ~ 7
System Variable Value:
0 : display as grid lines for model space, block editor, drawing and paper space in layout
1 : display as points for model space
2 : display as points for block editor 
4 : display as points for drawing and paper space in layout