This .NET class wraps the AcDbDatabaseSummaryInfo ObjectARX class. 

That class is a pure virtual class for encapsulating a set of character strings that can be used to add additional information to a DWG file. The maximum length of these strings is dependent on several items, but will always be at least 1,000 characters. This information is stored and retrieved in the SummaryInfo object with specific methods for each information field. 

You may create your own custom fields in addition to the predefined fields. These custom fields are stored in a list, and you can manipulate custom fields by either their name (or key) or by their position (index) in the list. Custom fields are indexed starting at 1, and there is no limit to the number of fields you may create.

Public Structure DatabaseSummaryInfo
End Structure

public struct DatabaseSummaryInfo {
}