This option must be set to the name of your custom authentication cookie when you set AuthenticationMode to WindowsClientWebDesignerAuthenticationModes.CustomCookie. The Windows Client Web Designer will copy that cookie's value from the request in which the Designer Control is rendered, and use it for all requests made by the Windows Client Web Designer client application.

public static string AuthenticationCustomCookieName {get; set;}

public:
static property String^ AuthenticationCustomCookieName {
   String^ get();
   void set (    String^ value);
}

'Declaration
 
Public Shared Property AuthenticationCustomCookieName As String