Can I create a water mark using C#.net to word

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C#

Can I create a water mark using C#.net for every page. Right now I am getting it only for one page, but I need to get this watermark on every page.
Can any body help?
I'll show my code which works for only one page:

    Word.Shape logoWatermark = null;
    oRng = oDoc.Bookmarks.get_Item(ref oEndOfDoc).Range;
     Word.Application headerApp = oDoc.Sections[1].Headers[Word.WdHeaderFooterIndex.wdHeaderFooterEvenPages].Application;
logoWatermark = headerApp.ActiveDocument.Shapes.AddTextEffect(Microsoft.Office.Core.MsoPresetTextEffect.msoTextEffect1, textBox4.Text, "Arial", (float)60, Microsoft.Office.Core.MsoTriState.msoTrue, Microsoft.Office.Core.MsoTriState.msoFalse, 0, l, ref oMissing);
                                    logoWatermark.Select(ref oMissing);
                                    logoWatermark.Fill.Visible = Microsoft.Office.Core.MsoTriState.msoTrue;
                                    logoWatermark.Line.Visible = Microsoft.Office.Core.MsoTriState.msoFalse;
                                    logoWatermark.Fill.Solid();
                                    logoWatermark.Fill.ForeColor.RGB = (Int32)Word.WdColor.wdColorGray05;
                                    logoWatermark.RelativeHorizontalPosition = Word.WdRelativeHorizontalPosition.wdRelativeHorizontalPositionMargin;
                                    logoWatermark.RelativeVerticalPosition = Word.WdRelativeVerticalPosition.wdRelativeVerticalPositionMargin;
                                    logoWatermark.Left = (float)Word.WdShapePosition.wdShapeCenter;
                                    logoWatermark.Top = (float)Word.WdShapePosition.wdShapeCenter;
                                    logoWatermark.Height = oWord.InchesToPoints(1f);
                                    logoWatermark.Width = oWord.InchesToPoints(6f);
                                    oWord.ActiveWindow.ActivePane.View.SeekView = Word.WdSeekView.wdSeekMainDocument;

here i want the information about the watermark in the text docment, i had seen that in the watermark in the images but it contains lot of difference , which we are going to use in the text doc
plesae give me the information about the textdoc