Give web control additional properties and methods.
For a list of all members of this class, see eWebControl Members.

All input controls used in DataForm not only inherit their original input control, for example textbox inherits System.Web.UI.WebControls.TextBox, but also implement eWebControl interface. So you can get input control by eDataForm.FindControl(id) and either convert them to appropriate type of control or convert them to eWebControl type. By using eWebControl, you can get control's value directly by eValue property no matter what type of control is.