When a Telerik RadTextBox contains a line break, a postback is triggered any time focus is lost on the textbox, even if the text hasn’t been changed. If a normal ASP Textbox is used instead of a Telerik one, no postback occurs if the text hasn’t been changed, even if the text contains a line break. We need the Telerik RadTextBox to behave like the ASP Textbox.

See the attached file for a simple example of this behavior, and let me know if you have any other questions about it.

ADMIN: Attached is also a workaround.