To help you get started with the right version, are you using: (WinForms) NET 6/7+ ?
DLLs are available from repositories like DLLme or SourceForge . Key Features FastColoredTextBox.dll
Supports built-in languages (CSharp, VB, HTML, XML, SQL, Lua) and custom highlighting. Code Folding: Allows collapsing/expanding code blocks. To help you get started with the right
// 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 fctb.Language = Language.CSharp