Thanks. With SelectionSet I know how to create filter with a SelectionFilter. I want to find method for GetEntity. I found it in sample from Mr Kean WalmSley. We use PromptEntityOptions.AddAllowedClass(). But it's only filter for class, not all properties like color, linetype, layer...
See detail at here >>>>>>> this link<<<<<<<<<
GetEntity will return a PromptEntityResult which contains the ObjectID of the entity selected. You can then open it for read and examine the ent's properties. If it doesn't meet your criteria, you can prompt them to select again.