Visual Studio editor show dots in blank spaces?

In my Visual Studio text editor. All my blank spaces are replaced by a "."

public class Employee
{
  string name;
}

looks like this

public..class..Employee..........................
{..................
..string.name;...................
}.....................

Solution:-
To remove dots follow the below methods.

Method 1:- 
       Go to

            Edit -> Advanced -> View White Spaces

Method 2:-
           Press Ctrl+R, Ctrl+W