Delete a page from a word document by C#

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C#

WinForms

C#3.5

I want to delete any page from a word document. Is there any way to do it?
I can only delete some lines from the page. Is there any way to count the no of lines from the page? Then I can delete the whole page.. Or if there any other way of deleting the page, please help me then. Below I am giving the code that I have done.. which can only delete some lines from a page.
In textbox1, I am taking the value of the page no, which I want to delete.

private void button1_Click(object sender, EventArgs e)
        {
            string filePath = null;
            //First we need to create a new OpenFileDialog:
            OpenFileDialog fDialog = new OpenFileDialog();

            //The title of the OpenFileDialog window:
            fDialog.Title = "Open text/word File";

            //Here we allow to be opened only files with the .txt and .doc extension:
            fDialog.Filter = "Text Files|*.txt|Doc Files|*.docx";

            //we set the InitialDirectory property
            fDialog.InitialDirectory = @"C:\";

            if (fDialog.ShowDialog() == DialogResult.OK)
            {

                //MessageBox.Show(fDialog.FileName.ToString());
                filePath = fDialog.FileName.ToString();
            }

            object missing = System.Reflection.Missing.Value;
            object fileName = filePath;
            object readOnly = false;
            object isVisible = true;

            //Start Word and open a document.  
            Word._Application oWord;
            Word._Document oDoc1, oDoc2;
            oWord = new Word.Application();
            oWord.Visible = true;

            oDoc1 = oWord.Documents.Open(ref fileName, ref missing, ref readOnly,
                ref missing, ref missing, ref missing, ref missing, ref missing,
                ref missing, ref missing, ref missing, ref isVisible, ref missing,
                ref missing, ref missing, ref missing);

              
            int y = 0;
            int.TryParse(textBox1.Text.ToString(), out y);
            object gotoPage = Word.WdGoToItem.wdGoToPage;
            object gotoNext = Word.WdGoToDirection.wdGoToNext;
            object gotoCount = null;
            object gotoName = y;

            object unit = Word.WdUnits.wdLine;
           
            //var lineCount =File.ReadLines(filePath).Count();
            //The lines you want to delete... 
            
                    object count = 1;
                    object extend = Word.WdMovementType.wdExtend;

                    oWord.Selection.GoTo(ref gotoPage, ref gotoNext, ref gotoCount, ref gotoName);
                    oWord.Selection.MoveDown(ref unit, ref count, ref extend);
                    oWord.Selection.TypeBackspace();
              
        }