Gets or sets the error message displayed when the user enters a user name that is already in use in the membership provider.
Assembly: System.Web (in System.Web.dll)
Property ValueType: System.String
The error message displayed when the user enters a user name that is already in the membership provider. The default value is "Please enter a different user name." The default text for the control is localized based on the server's current locale.
Available since 2.0