The easiest way to get the full, functional DLL is through NuGet: Install-Package FCTB .

The FastColoredTextBox.dll is a specialized .NET Windows Forms text box control used for syntax highlighting, code folding, and large text editing, commonly utilized in script editors, IDEs, and code-related projects. Here is the complete information regarding the component:

Due to its common use in script executors, the DLL may sometimes cause false-positive warnings from antivirus software.

Optimized for both small files and very large files.

In Visual Studio, right-click the Toolbox, select Choose Items , and browse to select the FastColoredTextBox.dll . Usage Example:

The project is open-source. You can download the source and build the DLL from the PavelTorgashov/FastColoredTextBox GitHub repository .

To help you get started with the right version, are you using: (WinForms) NET 6/7+ ?