DeflateStream??

Question

I try to write a compression application using Deflate Algorithm. However, when my compressed file is larger than my original file. Below is my code. I use window form so here are some clarifications. I use openFileDialog to choose a file, so openFileDialog.FileName hold the path. I write the compressed bytes to a memory stream. When it done, it check the length of my FileStream and my MemoryStream. The length of my MemoryStream is a lot bigger, which does not make any sense at all

                 infile = new FileStream(openFileDialog.FileName, FileMode.Open, FileAccess.Read, FileShare.Read);
                byte[] buffer = new byte[infile.Length];
                //Read From the file
                int count1 = infile.Read(buffer, 0, buffer.Length);
                if (count1 != buffer.Length)
                {
                    MessageBox.Show("Cannot Read From File");
                    infile.Close();
                    return;
                }
                infile.Close();
                MemoryStream ms = new MemoryStream();
                //Use this newly memory stream for the compressed data
                DeflateStream compressedZipStream = new DeflateStream(ms, CompressionMode.Compress, true);
                //Write data from the buffer array into the stream
                compressedZipStream.Write(buffer, 0, buffer.Length);
                //Close the stream
                compressedZipStream.Close();
                txtOriginal.Text = buffer.Length.ToString();
                txtCompressed.Text = ms.Length.ToString();