I would recommend looking at the Fast Colored Text Box ( https://www.codeproject.com/Articles/161871/Fast-Colored-TextBox-for-syntax-highlighting-2 https://www.

I would recommend looking at the Fast Colored Text Box ( https://www.codeproject.com/Articles/161871/Fast-Colored-TextBox-for-syntax-highlighting-2 https://www.codeproject.com/Articles/161871/Fast-Colored-Tex... ) It is a .net control that has built in syntax coloring. Some of the sample code are full fledged editors. If you are doing html and occasionally for other purposes foxe html editor is highly underrated. http://www.firstobject.com/dn_editor.htm http://www.firstobject.com/dn_editor.htm