This is a part of code to modify data from the existing data from database to new data that typed in the web page. Once it reads the data from database, the ModifyCustomer method takes the parameters as the old data from the database. Could you tell me how to update the data?

Thanks,

private void Page_Load(object sender, System.EventArgs e)
        {
            if (Tools.IsLoggedIn())
            {
                Process = "MODIFY";

                MyProject.UserDetails myUserDetails = new MyProject.UserDetails();
                MyProject.User obj = new MyProject.User();

                myUserDetails = obj.GetUserDetails(Request.Cookies["email"].Value);
                txtLastName.Text = myUserDetails.LastName;
                txtFirstName.Text = myUserDetails.FirstName;
                txtEmail.Text = Request.Cookies["email"].Value;
                txtUserPwd.Text = myUserDetails.UserPwd;
                txtAdd1.Text = myUserDetails.Address;
                txtPrefix.Text = myUserDetails.Prefix;
                txtPhoneNumber.Text = myUserDetails.PhoneNumber;
                txtEmail.Enabled = false;
                obj = null;

                GuestMenu.Visible = false;
                RegisteredMenu.Visible = true;
}
}

private void btnSubmit_Click(object sender, System.EventArgs e)
        {
            if (Page.IsValid)
            {
                MyProject.User obj = new MyProject.User();
                string strStatus;

// Code for Update goes here


                    strStatus = obj.ModifyCustomer(txtLastName.Text,
                        txtFirstName.Text,
                        txtEmail.Text,
                        txtUserPwd.Text,
                        txtAdd1.Text,
                        txtPrefix.Text,
                        txtPhoneNumber.Text);
.........