RadTextBox is a themeable alternative to the standard Windows Forms text box control. It allows you to include a text box in your applications that is consistent in look and feel with the other Telerik UI for WinForms controls you use. In addition, it allows you to set a default text to be displayed when there is no actual data in the text box. You can also use Smart Tags, set Properties and Customize its Appearance.
Download and check out the online demo at demos.telerik.com