Why does the Visual Studio editor show dots in blank spaces?

I got dots in blank spaces in my Visual Studio 2010 editor, I have tried to reset the Visual studio 2010 but that also did not help me out. When I search in google, I saw I have configured to show white space.
To resolve this you can go to Edit menu in visual studio then Advanced ->unSelect View White Spaces as shown in the figure below.

Also you can use the shotcut key  Ctrl+R, Ctrl+W.
Sometimes shotcut keys are also dangerous !!!