C# Export datagridview Selected rows to Word

Question

I have a DataGridView in my Form. What i am trying to do is if a user select a row and press Button(button_1) data from that row should be send to a word document and replace a number according to the column[i]. Now with the code below
Problem 1 when i select one row and click the button, data finds and replaces number in Word file, But it replaces all the occurrences of for example "1" but i only want it to be done once because i want to do it for each row.
Problem 2 if a user select More than one row only last selected row data is exported. Any Ideas??

 private void button1_Click(object sender, EventArgs e)
    {

        string SendPath = "";

        if (openFileDialogWord.ShowDialog(this) == DialogResult.OK)
        {
            SendPath =  (openFileDialogWord.InitialDirectory + openFileDialogWord.FileName).ToString();
        }


        WordDoc(SendPath);
    }



    public void WordDoc(string getfilename)
    {



        object FileName = getfilename; //The filepath goes here


        //Create word Application Object
        Word.Application word = new Word.Application();

        //Create word document Object
        Word.Document doc = null;

        //Create word Missing Object
        object missing = System.Type.Missing;

        object readOnly = false;
        object isVisible = false;
        // make visible Word application
        word.Visible = true;

        try
        {
            doc = word.Documents.Open(ref FileName, ref missing, ref missing,
            ref missing, ref missing, ref missing, ref missing, ref missing,
            ref missing, ref missing, ref missing, ref missing, ref missing,
            ref missing, ref missing, ref missing);
            doc.Activate();




            string Column1;
            string Column2;

            foreach (DataGridViewRow rows in dataGridView1.SelectedRows)
            {


                Column1 = rows.Cells[1].Value.ToString();
                Column2 = rows.Cells[2].Value.ToString();

                this.FindAndReplace(word, "1", Column1);
                this.FindAndReplace(word, "2", Column2);

            }

            MessageBox.Show("Complete");


        }
        catch (Exception ex)
        {
            MessageBox.Show("Error : " + ex.Message);
        }
    }



    private void FindAndReplace(Word.Application word, object findText, object replaceText)
    {
        object matchCase = true;
        object matchWholeWord = true;
        object matchWildCards = false;
        object matchSoundsLike = false;
        object matchAllWordForms = false;
        object forward = true;
        object format = false;
        object matchKashida = false;
        object matchDiacritics = false;
        object matchAlefHamza = false;
        object matchControl = false;
        object read_only = false;
        object visible = true;
        object replace = 2;
        object wrap = 1;
        word.Selection.Find.Execute(ref findText, ref matchCase,
        ref matchWholeWord, ref matchWildCards, ref matchSoundsLike,
        ref matchAllWordForms, ref forward, ref wrap, ref format,
        ref replaceText, ref replace, ref matchKashida,
        ref matchDiacritics,
        ref matchAlefHamza, ref matchControl);
    }