private void SendMessageBox_TextChanged(object sender, EventArgs e) { if (m_SendMessageBox.Text == m_HelpText) { m_SendMessageBox.Font = m_BackupFont; m_SendMessageBox.ForeColor = Color.LightGray; m_HasValidSendString = false; return; } m_SendMessageBox.Font = m_InputFont; if (File.Exists(NgimuApi.Helper.ResolvePath(m_SendMessageBox.Text)) == true) { m_HasValidSendString = true; m_SendMessageBox.ForeColor = Control.DefaultForeColor; } else { OscPacket packet; m_HasValidSendString = OscPacket.TryParse(m_SendMessageBox.Text.Trim(), out packet); m_SendMessageBox.ForeColor = m_HasValidSendString ? Control.DefaultForeColor : Color.Red; } }