Use SetCustomProperty to create a custom document property. Pass the method the name and value of the property. The value can be one of the following types, depending on the property: String, Double, Integer, Boolean, or DateTime.

 public void SetCustomProperty(System.String key, System.Object value)

Public Sub SetCustomProperty(ByVal key As String, ByVal value As Object)

The key or name of the custom property.

The value of the custom property.