private void SourcePropertiesDlg_Load(object sender, EventArgs e)
        {
            StringBuilder szInfo = new StringBuilder(256);

            TwainAPI.DTWAIN_GetSourceProductName(m_Source, szInfo, 255);
            this.edProductName.Text = szInfo.ToString();
            TwainAPI.DTWAIN_GetSourceProductFamily(m_Source, szInfo, 255);
            this.edFamilyName.Text = szInfo.ToString();
            TwainAPI.DTWAIN_GetSourceManufacturer(m_Source, szInfo, 255);
            this.edManufacturer.Text = szInfo.ToString();
            TwainAPI.DTWAIN_GetSourceVersionInfo(m_Source, szInfo, 255);
            this.edVersionInfo.Text = szInfo.ToString();

            int lMajor = 0, lMinor = 0;

            TwainAPI.DTWAIN_GetSourceVersionNumber(m_Source, ref lMajor, ref lMinor);
            string sVersion = lMajor.ToString() + "." + lMinor.ToString();

            this.edVersion.Text = sVersion;

            DTWAIN_ARRAY AllCaps = 0;
            int          Val     = 0;

            TwainAPI.DTWAIN_EnumSupportedCaps(m_Source, ref AllCaps);
            int nSize = TwainAPI.DTWAIN_ArrayGetCount(AllCaps);

            for (int i = 0; i < nSize; ++i)
            {
                // get the cap value
                TwainAPI.DTWAIN_ArrayGetAtLong(AllCaps, i, ref Val);

                // get the name from the cap
                TwainAPI.DTWAIN_GetNameFromCap(Val, szInfo, 255);
                this.listCaps.Items.Add(szInfo.ToString());
            }

            this.edTotalCaps.Text = nSize.ToString();
            TwainAPI.DTWAIN_EnumCustomCaps(m_Source, ref AllCaps);
            this.edCustomCaps.Text = TwainAPI.DTWAIN_ArrayGetCount(AllCaps).ToString();
            TwainAPI.DTWAIN_EnumExtendedCaps(m_Source, ref AllCaps);
            this.edExtendedCaps.Text = TwainAPI.DTWAIN_ArrayGetCount(AllCaps).ToString();
        }