You can import word doc into richtextbox with following: private void PreviewRecord(object sender, EventArgs e) { string str; OpenFileDialog openfiledg = new OpenFileDialog(); openfiledg.Filter = "Word Document (*.doc)|*.doc|All Files (*.*)|*.*"; openfiledg.FilterIndex = 2; openfiledg.RestoreDirectory = true; if ((openfiledg.ShowDialog() == DialogResult.OK && openfiledg.FileName.Length > 0)) { IDataObject Data1; object nullobj, file; Microsoft.Office.Interop.Word.Document wordDoc; Microsoft.Office.Interop.Word.ApplicationClass WordApp = new Microsoft.Office.Interop.Word.ApplicationClass(); nullobj = System.Reflection.Missing.Value; file = openfiledg.FileName; wordDoc = WordApp.Documents.Open(ref file, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj); wordDoc.ActiveWindow.Selection.WholeStory(); wordDoc.ActiveWindow.Selection.Copy(); Data1 = Clipboard.GetDataObject(); str = Data1.GetData(DataFormats.Rtf).ToString(); richTextBox1.Rtf = str; wordDoc.Close(ref nullobj, ref nullobj, ref nullobj); } }