I have just built a new sample that illustrates how to drag and drop selected text inside TX Text Control. It uses the MouseUp, MouseDown and MouseMove events to realize this easy approach to rearrange text portions in a document.

Read the full article and download the sample project in our source code library:

Drag And Drop Text in TX Text Control .NET for Windows Forms

Feel free to contact me, if you have would like to discuss this sample or if you have additional suggestions.