public void btnChangepwd_Click(object sender, RoutedEventArgs e)
{
var obj = ((FrameworkElement)sender).DataContext as Users;
string newPass = StringExtensions.GetRandomString();
BL_Users.Update(obj, newPass);
BL_Users.SendCredentials(obj.Firstname, obj.Lastname, obj.Email, obj.Username, newPass);
MessageBox.Show("The new password has been sent to the user.", "New password");
BindData();
}