private void btnChange_Click(object sender, EventArgs e)
        {
            string sUsername = txtUsername.Text;
            string sOPassword = txtOriginalPassword.Text;
            string sNPasswprd = txtNewPassword.Text;
            string sCPassword = txtConfirmPassword.Text;

            DataClasses1DataContext dc = new DataClasses1DataContext();

            var loginCheck =
                dc.GetTable<User>().SingleOrDefault(credentials => credentials.Username == sUsername && credentials.Password == sOPassword);

            if (sNPasswprd == sCPassword)
            {
                Table<User> tUser = dc.GetTable<User>();

                loginCheck.Password = sCPassword;
                loginCheck.Username = sUsername;
                dc.SubmitChanges();
                this.Close();
            }
            else
            {
                MessageBox.Show("Unfortunately the Password for that User Account does not exist, or you have incorrectly typed your new passwords!", "Password Change Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

                this.Close();
            }

        }