|  BaseMessage | Basic error message. All versions. | 
|  Code | Error code. PostgreSQL 7.4 and up. | 
|  Data (inherited from Exception) | |
|  Detail | Detailed error message. PostgreSQL 7.4 and up. | 
|  ErrorCode (inherited from ExternalException) | |
|  Errors | Returns the entire list of errors provided by the PostgreSQL backend. | 
|  ErrorSql | String containing the sql sent which produced this error. | 
|  File | Source file (in backend) reporting the error. PostgreSQL 7.4 and up. | 
|  HelpLink (inherited from Exception) | |
|  Hint | Suggestion to help resolve the error. PostgreSQL 7.4 and up. | 
|  InnerException (inherited from Exception) | |
|  Item | Provide access to the entire list of errors provided by the PostgreSQL backend. | 
|  Line | Source file line number (in backend) reporting the error. PostgreSQL 7.4 and up. | 
|  Message (inherited from Exception) | |
|  Position | Position (one based) within the query string where the error was encounterd. PostgreSQL 7.4 and up. | 
|  Routine | Source routine (in backend) reporting the error. PostgreSQL 7.4 and up. | 
|  Severity | Severity code. All versions. | 
|  Source (inherited from Exception) | |
|  StackTrace (inherited from Exception) | |
|  TargetSite (inherited from Exception) | |
|  Where | Trace back information. PostgreSQL 7.4 and up. | 
|  Equals (inherited from Object) | |
|  GetBaseException (inherited from Exception) | |
|  GetHashCode (inherited from Object) | |
|  GetObjectData | |
|  GetType (inherited from Exception) | |
|  ToString | Format a .NET style exception string. Include all errors in the list, including any hints. | 
NpgsqlException Class | Npgsql Namespace