Find Text Position In word document in C#

A way with Word Interop :

                Microsoft.Office.Interop.Word.Application oWordApplication = new Microsoft.Office.Interop.Word.Application();
                Microsoft.Office.Interop.Word.Documents oWordDocuments = oWordApplication.Documents;
                Microsoft.Office.Interop.Word.Document oWordDocument = oWordDocuments.Open(@"e:\\test.doc");
                //oWordApplication.Visible = true;
                object oFindText = "test";
                object oMissing = System.Reflection.Missing.Value;
                Microsoft.Office.Interop.Word.Range range = oWordApplication.ActiveDocument.Content;
                while (true)
                {                   
                    range.Find.Execute(
                       ref oFindText, ref oMissing, ref oMissing, ref oMissing, ref oMissing,
                       ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing,
                       ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing);
                    if (range.Find.Found)
                    {
                        int nLine = range.get_Information(Microsoft.Office.Interop.Word.WdInformation.wdFirstCharacterLineNumber);
                        int nColumn = range.get_Information(Microsoft.Office.Interop.Word.WdInformation.wdFirstCharacterColumnNumber);
                        MessageBox.Show(string.Format("Line = {0} - Column {1}\r\n", nLine, nColumn), "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }
                    else
                       break;
                }
                oWordApplication.Quit();
                Marshal.ReleaseComObject(oWordDocument);
                Marshal.ReleaseComObject(oWordDocuments);
                Marshal.ReleaseComObject(oWordApplication);