Why blue dots and arrows appear on Visual Studio 2012 spaces

Blue dots and arrows appear on Visual Studio 2012 spaces:

I suddenly found that when I opened Visual Studio 2012, there were a lot of blue dots and arrows, and the solution was: Press the shortcut key ctrl+r+w or ctrl+e+s, everything is done.

In fact, many times we want to see how much space between code and code is empty, as if it's not obvious to the naked eye, as Visual Studio 2010 gives us this functionality. Let's take a look at the usual code, as shown in the following illustration:

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At this time we stand-alone "edit"-"advanced"-"View Blank" command, as shown in the following figure:

Look at the code again, as shown in the following figure:

A space is expressed in a single point, so it is much clearer.

Of course, you can also press the "Ctrl+r" key combination, and then press the "CTRL+W" key combination can turn off this function.