public void load() { if (FormDV != null) { FormDV.CreateDocument(); documentViewer1.DocumentSource = FormDV; documentViewer1.Refresh(); } else if (FormKH != null) { FormKH.CreateDocument(); documentViewer1.DocumentSource = FormKH; documentViewer1.Refresh(); } else if (FormNV != null) { FormNV.CreateDocument(); documentViewer1.DocumentSource = FormNV; documentViewer1.Refresh(); } else if (FormPSC != null) { FormPSC.CreateDocument(); documentViewer1.DocumentSource = FormPSC; documentViewer1.Refresh(); } else if (FormPT != null) { FormPT.CreateDocument(); documentViewer1.DocumentSource = FormPT; documentViewer1.Refresh(); } else if (FormTB != null) { FormTB.CreateDocument(); documentViewer1.DocumentSource = FormTB; documentViewer1.Refresh(); } else if (FormDT != null) { FormDT.CreateDocument(); documentViewer1.DocumentSource = FormDT; documentViewer1.Refresh(); } }