Database is not updating after exiting from the application.

Actually my database is storing data temporarily. when I start the application and store the data through application, I can see the data. But after terminating the application the entered data are disappeared. Manually entered data are there. I googled it. I tried every possibilities. But, cant solve it.  everyone is saying that when my app runs it create a temporary database, where the data are stored. but after stopping the app ,The original database has not been updated. I am a beginner. I have stuck here for last 3 days. Any one please pull me out. I have to submit my database project. Any help should be appreciated. And please try to say elaborately as I have already mentioned that I am a beginner.

My form1.cs is-->

using System;
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Windows.Forms;
namespace db3
{
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        try
        {
            System.Data.SqlClient.SqlConnection sqlConnection1 =
    new System.Data.SqlClient.SqlConnection(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\Resources\db2.mdf;Integrated Security=True;Connect Timeout=30");

            System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand();
            cmd.CommandType = System.Data.CommandType.Text;
            cmd.CommandText = "INSERT [Table] (Id, name) VALUES (5, 'e')";
            cmd.Connection = sqlConnection1;

            sqlConnection1.Open();
            cmd.ExecuteNonQuery();
            sqlConnection1.Close();
            MessageBox.Show("inserted");
        }
        catch(Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
        }
}
}

<?xml version="1.0" encoding="utf-8" ?><configuration><configSections></configSections><connectionStrings><add name="db3.Properties.Settings.empconstring" connectionString="Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\Resources\db2.mdf;Integrated Security=True;Connect Timeout=30"
            providerName="System.Data.SqlClient" /></connectionStrings><startup> <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" /></startup></configuration>