C # Automation response when you save Word after you edit it

Using System;
Using System.Collections.Generic;
Using System.ComponentModel;
Using System.Data;
Using System.Diagnostics;
Using System.Drawing;
Using System.Linq;
Using System.Text;
Using System.Threading.Tasks;
Using System.Windows.Forms;

Using Msword=microsoft.office.interop.word;

namespace Word
{
public partial class Form1:form
{
Public Form1 ()
{
InitializeComponent ();
}
private void Form1_Load (object sender, EventArgs e)
{
}
Msword.application WordApp;

private void Button1_Click (object sender, EventArgs e)
{
OpenFileDialog p_getfile = new OpenFileDialog (); Create an Open File dialog box object
DialogResult p_dr = P_getfile.showdialog (); Show Open File dialog box
object omissing = System.Reflection.Missing.Value;
if (p_dr = = DialogResult.OK)//click OK
{
WordApp = new Msword.application ();
Wordapp.visible = true;
Object obj = (object) (P_getfile.filename);
WordApp.Documents.Open (ref obj, ref omissing, ref omissing, ref omissing, ref omissing, ref omissing, ref omissing, ref OM Issing, ref omissing, ref omissing, ref omissing, ref omissing, ref omissing, ref omissing, ref omissing, ref omissing);
}
Wordapp.documentbeforesave + = new Msword.applicationevents4_documentbeforesaveeventhandler (wordApp_ DocumentBeforeSave);
}
private void Wordapp_documentbeforesave (Msword.document doc, ref bool SaveAsUi, ref bool Cancel)
{
MessageBox.Show ("Hello Office");
}
}
}

C # Automation response when you save Word after you edit it