CODE EXAMPLE FOR CSHARP

Get replace normal text from word document in C#

object o = Missing.Value;
object oFalse = false;
object oTrue = true;

Word._Application app = null;
Word.Documents docs = null;
Word.Document doc = null;

object path = @"C:pathfile.doc";

try
{
    app = new Word.Application();
    app.Visible = false;
    app.DisplayAlerts = Word.WdAlertLevel.wdAlertsNone;

    docs = app.Documents;
    doc = docs.Open(ref path, ref o, ref o, ref o, ref o, ref o, ref o, ref o, ref o, ref o, ref o, ref o, ref o, ref o, ref o, ref o);
    doc.Activate();

    foreach (Word.Range range in doc.StoryRanges)
    {
        Word.Find find = range.Find;
        object findText = "[Company_Name]";
        object replacText = "Sacramento";
        object replace = Word.WdReplace.wdReplaceAll;
        object findWrap = Word.WdFindWrap.wdFindContinue;

        find.Execute(ref findText, ref o, ref o, ref o, ref oFalse, ref o,
            ref o, ref findWrap, ref o, ref replacText,
            ref replace, ref o, ref o, ref o, ref o);

        Marshal.FinalReleaseComObject(find);
        Marshal.FinalReleaseComObject(range);
    }

    doc.Save();
    ((Word._Document)doc).Close(ref o, ref o, ref o);
    app.Quit(ref o, ref o, ref o);
}
finally
{
    if (doc != null)
        Marshal.FinalReleaseComObject(doc);

    if (docs != null)
        Marshal.FinalReleaseComObject(docs);

    if (app != null)
        Marshal.FinalReleaseComObject(app);
}