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Base class for the CustomPropertyCollection and BuiltInPropertyCollection
public class DocumentPropertyCollection : IEnumerable<DocumentProperty>, IEnumerable
  Public Class DocumentPropertyCollection
    Implements IEnumerable(Of DocumentProperty), IEnumerable
  | Name | Description | 
|---|---|
| Count | Returns the number of properties in the collection.  | 
      
| this[string] | Gets a document property by the case-insensitive name.  | 
      
| Name | Description | 
|---|---|
| Contains(string) | Gets whether a property with specified name exists in the document.  | 
      
| TryGetValue(string, out DocumentProperty) | Gets a document property by the case-insensitive name.  |