public string? LongArgumentNamePrefix { get; set; }Public Property LongArgumentNamePrefix As String
	Get
	Set
Dim instance As ParseOptionsAttribute
Dim value As String
value = instance.LongArgumentNamePrefix
instance.LongArgumentNamePrefix = valuepublic:
property String^ LongArgumentNamePrefix {
	String^ get ();
	void set (String^ value);
}This property is only used if the Mode property is LongShort, or if the parsing mode is set to LongShort elsewhere.
Use the ArgumentNamePrefixes to specify the prefixes for short argument names.
This value can be overridden by the LongArgumentNamePrefix property.