I am trying to modify a word document and inserting data at some specific positions( I have a template document which I must get it ready and fill all the blank spaces ).I am using Microsoft.Office.Interop.Word library and till now I just figure out how to insert text at the end of the document, I will write down the code too so maybe someone can help me out.Thanks!

```
     private void button1_Click(object sender, EventArgs e)

        string str = null;
        OpenFileDialog dia = new OpenFileDialog();
        if (dia.ShowDialog() == System.Windows.Forms.DialogResult.OK)
        {
            str = dia.FileName;
            Microsoft.Office.Interop.Word.Application app = new Microsoft.Office.Interop.Word.Application();
            Microsoft.Office.Interop.Word.Document doc1 = app.Documents.Open(str);

            object missing = System.Reflection.Missing.Value;
            doc1.Content.Text += "Merge?";
            app.Visible = true;
            doc1.Save();
            this.Close();

                }
            }

```