public Form1() { InitializeComponent(); m_TwainManager = new TwainManager(m_StrProductKey); m_ImageCore = new ImageCore(); dsViewer1.Bind(m_ImageCore); this.txtboxServer.Text = m_strServerName; this.txtboxPort.Text = m_strPort; this.txtboxActionPage.Text = m_strActionPage; this.txtboxFileName.Text = "DNT_Image"; this.rdbtnJPEG.Checked = true; this.chkboxMultiPage.Enabled = false; int lngNum; m_TwainManager.OpenSourceManager(); for (lngNum = 0; lngNum < m_TwainManager.SourceCount; lngNum++) { cmbSource.Items.Add(m_TwainManager.SourceNameItems(Convert.ToInt16(lngNum))); // display the available imaging devices } if (lngNum > 0) { cmbSource.SelectedIndex = 0; } }