Connection string to another pc

okay so im new to database im still learning so my sql local database is working fine on my pc where im using visual studio 2012 whenever i move the file to open my project on my college's pc or laptop i cant seem to get the database connected since the connection string for that pc is different where i need to manually change my string is there easy solution for this? help needed.

to make it work i had to manually string it everytime

public partial class adminLogin : System.Web.UI.Page
{
    SqlConnection con = new SqlConnection(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=C:\UsersSuren\Documents\Visual Studio 2012\Projects\Shopee mobile\Shopee mobile\App_Data\shopping.mdf;Integrated Security=True");
    int i;
    protected void Page_Load(object sender, EventArgs e)
    {
}

protected void b1_Click(object sender, EventArgs e)
{
    con.Open();
    SqlCommand cmd = con.CreateCommand();
    cmd.CommandText = "select * from admin_login where username='"+t1.Text+"' and password='"+t2.Text+"'";
    cmd.ExecuteNonQuery();
    DataTable dt = new DataTable();
    SqlDataAdapter da = new SqlDataAdapter(cmd);
    da.Fill(dt);
    i = Convert.ToInt32(dt.Rows.Count.ToString());
    if (i == 1)
    {
        Response.Redirect("testing.aspx");
    }
    else
    {
        l1.Text = "Invalid password or username";
    }

    con.Close();
}

}

#c-sharp #asp.net