Q:

Add unicode characters as part of label in Winforms with C#

I want to change a label. Text to be: "This " + [this sign] + "sign", but when I'm doing that the sign won't display correctly. 

A:

C# text is Unicode, so the problem won't be that the character cannot be encoded properly.  Therefore the most plausible explanation is that the font you use does not contain a glyph for this character.  The solution will therefore be to use a font that does.