TextDocument newDoc = new TextDocument();
TextDocument doc = new TextDocument(); doc.Load("C:/example.txt");
TextDocument doc = new TextDocument(); doc.Text = "Hello, World!"; doc.Insert(6, "from C#");In this example, a new instance of the TextDocument class is created and the Text property is set to "Hello, World!". The Insert method is then called to insert the string "from C#" into the document at index 6, resulting in the document containing the string "Hello, from C# World!". The Mono.TextEditor library is an open-source library written in C# and intended for use in text editor applications.