how to hide hyphen in a gap before first character in text editor in .Net?

Question

I pressed some button on keyboard then in my current view has a hyphen in empty space in front of a first character in each line.

I really don't know what is this property?

how to hide them?

------------_appearanceOption.Brush = _brush;
------------_appearanceOption.Font = _batchHeaderFont;

Answer 1

That is know as the "View White Space" feature, and can be toggled with the menu:

Edit > Advanced > View White Space

or with keyboard shortcuts:

Ctrl + E, S

Answer 2

That is View White Space

Try this Ctrl+E,S

or

Press Ctrl+R, Ctrl+W.

or

Go to Edit -> Advanced -> and uncheck  "View Whitespace"