I have a relatively large program that I'm optimizing for ASCII input files around 10-80mB in size. The program reads every line of the file into a stringbuilder and then sets the Text field of the ScintillNET object to the stringbuilder. The stringbuilder is then set to null.

private void ReloadFile(string sFile)
{
        txt_log.ResetText();

        try
        {
            StringBuilder sLine = new StringBuilder("");
            using (StreamReader sr = new StreamReader(sFile))
            {
                while (true)
                {
                    string temp = sr.ReadLine();
                    if (temp == null) break;
                    sLine.AppendLine(temp);
                }
                sr.Close();
            }

            txt_log.Text = sLine.ToString();
            sLine = null;
        }
        catch (Exception ex)
        {
            MessageBox.Show(this, "An error occurred opening this file.\n\n" + ex.Message, "File Open Error",
                MessageBoxButtons.OK, MessageBoxIcon.Error);
        }

        GC.Collect();

}

The program has an option to reload or open a file. This is irrelevant, as any call to txt_log.Text seems to not get rid of the previous memory used for the .Text field. Commenting out the txt_log.Text line gives proper memory behavior. The GC.Collect() line seems pointless, and I have tried both with and without it.

Is there something I'm missing here? I HIGHLY doubt it's a problem with the ScintillaNET component itself--rather something in this code.