SqlCe Memory Issue

Hi all, I am querying an SqlCe Database on my PDA and noticed that the device is slowly running out of memory every time I execute a query. I am using the following code:

public  SqlCeDataReader ExecuteReader(string command, params SqlCeParameter[] commandParameters)
        {
            SqlCeDataReader reader = null;
            SqlCeCommand c = new SqlCeCommand(command, cn);
            try
            {
                for (int i = 0; i < commandParameters.Length; i++)
                    c.Parameters.Add(commandParameters);
                reader = c.ExecuteReader();
            }
            catch
            {
                // Release resources
                c.Parameters.Clear();
                reader.Close();
                throw;
            }
            c.Parameters.Clear();
            return reader;
        }

This method is a part of my 'SqlCeHelper' class that I have written.

I noticed that when I reach the line reader = c.ExecuteReader() , the memory of my device decreases by about 1%. The reader is returned to a class which makes use of it and then disposes of it by calling reader.Close(); The connection to the database is also closed properly at some point, but memory never gets released. Memory gets only released when the application terminates.

I am wondering if I am doing something wrong by not disposing of some resources. Please help!

(Also tried GC.Collect() , didn't help!)

Cheers.