Recently a question came up on how to get a list of all of the database names on a Pervasive / Actian PSQL server from C#. The short answer is to use the DtoDatabase object within the Distributed Tuning Object (DTO) COM object. A reference to the DTO Library will need to be added for this code to work.
This sample is a simple console application that takes three paramaters (ServerName, UserName, Password).
Here’s the code sample that shows how to get the list:

using System;
using DTOLib;

namespace dtoTest
{
	class Class1
	{
		[STAThread]
		static void Main(string[] args)
                {
			string compName = null;
			string userName = null;
			string password = null;
			DTOLib.dtoResult result;
			if (args.LongLength < 1)
			{
				Console.WriteLine("Invalid options.\n");
				return;
			}
			if (args.LongLength == 3)
			{
				compName = args[0].ToString();
				userName = args[1].ToString();
				password = args[2].ToString();
			}
			Console.WriteLine("List Pervasive Database using DTO and C#");
			DtoSession mDtoSession = new DTOLib.DtoSession();
			try
			{
				result = mDtoSession.Connect(compName, userName, password);
				if (result != 0)
				{
					Console.WriteLine("Error connecting to server.  Error code:");
				}
				else
                         {
					Console.WriteLine("Connected to " + mDtoSession.ServerName);
					DtoDatabase mDtoDatabase = new DTOLib.DtoDatabaseClass();
					int dbnCount = mDtoSession.DSNs.Count;
					Console.WriteLine("Found " + dbnCount.ToString() + " DBNs");
					for (int iCount = 1; iCount <= dbnCount; iCount++)
					{
						Console.WriteLine("DBN " + iCount.ToString() + ": ");
						mDtoDatabase = mDtoSession.Databases[iCount];
						Console.WriteLine("Name: " + mDtoDatabase.Name);
						Console.WriteLine("DDF Path: " + mDtoDatabase.DdfPath.ToString());
						Console.WriteLine("Data Path: " + mDtoDatabase.DataPath.ToString());
						Console.WriteLine("Flags: " + mDtoDatabase.Flags.ToString());
						Console.WriteLine("");
					}

					result = mDtoSession.Disconnect();
					Console.ReadLine();
				}
			}
			catch (Exception e1)
			{
				Console.WriteLine(e1.Message.ToString());
			}
		}
	}
}