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

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

Supports built-in languages (CSharp, VB, HTML, XML, SQL, Lua) and custom highlighting. Code Folding: Allows collapsing/expanding code blocks. FastColoredTextBox.dll

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

// Example: Configuring the textbox in code fctb = new FastColoredTextBox(); fctb.Language = Language.CSharp; fctb.Text = "public class Test {}"; fctb.SyntaxHighlightStyle = SyntaxHighlightStyle.Css; // Optional styling Controls.Add(fctb); Use code with caution. Copied to clipboard The easiest way to get the full, functional

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+ ? Code Folding: Allows collapsing/expanding code blocks

Ensure the FastColoredTextBox.dll is present in your project's bin/Debug or bin/Release folder, or re-install via NuGet.