Entity Framework error.

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C#

ASP.NET

.NET

ADO.NET

.NET4

Here's the error: Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded.

I keep getting this error, but I know this code should work. I am using a button to insert the data into a SQL database. Anyone got any suggestions, here's my code?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using USBatchDataModel;

public partial class _Default : System.Web.UI.Page
{
    USBatchDataEntities db = new USBatchDataEntities();
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void ButtonIn_Click(object sender, EventArgs e)
    {
        Contact con = new Contact();
        con.id = Convert.ToInt32(TextBox1.Text);
        con.fname = TextBox2.Text;
        con.lname = TextBox3.Text;
        con.phone = TextBox4.Text;
        db.Contacts.AddObject(con);
        db.SaveChanges(); 
       
    }