C# Debugging and Clean Up - A TimCo Retail Manager Video 

Tim hasn't even started the conversion to .net core and I have learned so much! Thanks Tim!

Hi tim great video as always .. the stuff i learn here are enormous ..the world needs more people like you.

Your process of eliminating bugs here are awesome sir Tim.

Another great episode, many thanks for this and the course. Much appreciated!

Great!! during all this crazy Corona times its the best time to keep moving on !!!

Hi Tim, I've just finished this video. This course is aswome! I think I've learned more in a week than during the 2-year-long vocational software developer school. I noticed a thing. It's not a bug , but could be useful regarding the remove function. We can only remove the items 1 by 1. Maybe it could be cool if we were able to remove more than 1 item. I mean the item's quantity. I don't know if this has already been implemented in the future videos, there is a lot to catch up to the current state. If it is already done, just ignore this comment. :) I was experimenting with removing the items from the cart, based on the item quantity, but when I add back the quantity to the existing items it would generate plus items. E.g. you add to the cart 5 Skillet from the existing 20 and you want to remove 6, you will end up having 21 skillet. I know I could fix it with an If statement, but I don't want to be off the track. I want to follow this series as precisely as I can, since I'm re-learning the C# with You right now. Thanks for the amazing content!

Hi again, the quantity field isn't updated after a checkout. Well, its updated after adding something to the cart. But when for whatever reason a user will change the resetted 1 to 100, then the 100 will still stay in the qty field. Just set ItemQuantity = 1; in our ResetSalesViewModel() after reinit the Cart property. Cheers Sebastian

One suggestion for handing the NotifyPropertyChange for multiple fields on adding, removing or clearing items from cart. Instead of adding set of NotifyOfPropertyChange for different properties in AddToCart, RemovingFromCart, ClearCart, we can create an eventhandler for the Cart.ListChanged event and add all the NotifyOfPropertyChange calls for all the dependent fields in this handler function. This way, whenever there is any change in the Cart list, these notify events will be called. Cart.ListChanged += Cart_ListChanged; private void Cart_ListChanged(object sender, ListChangedEventArgs e) { NotifyOfPropertyChange(nameof(CanCheckOut)); NotifyOfPropertyChange(nameof(CanRemoveFromCart)); NotifyOfPropertyChange(nameof(SubTotal)); NotifyOfPropertyChange(nameof(Tax)); NotifyOfPropertyChange(nameof(Total)); }

Tim, you spoke about adding Barcode reader functionality in this presentation. I think this will be a valuable addition. And like you said, it should not be a difficult addition. It will, however, be difficult when you try to do so by writing generic code that will accept any type of barcode reader. In other words, you write the code such that you don't need any specific barcode reader drivers from any specific manufacturer. If you can't do that, then you will be stuck with writing code for specific manufacturers, which will not be an attractive solution since you would prefer your users to just use any barcode reader, even the cheap ones from China that usually do not come with any device drivers. I would be very much interested in seeing how you go about writing generic code to accept any barcode reader. Best regards,

for the LogOffUser you can use some reflection :) foreach (var property in GetType().GetProperties()) { property.SetValue(this, default); }

Hi Tim, I actually started watching your videos before I decided to go to school. Love your videos. They chose Java for a couple classes. Any suggestions for Java skills?

Like always awesome videos. Your videos are very informative. I was wondering in your following videos or so or just a simple video I’m creating an application for school but like to use MVVM C# by having a top and bottom panel and a bottom initiate when pressed the top panel will slide to the bottom and the bottom panel will slide up. Then save the state of the panels when opening and closing the panel. If any body can help that’s awesome as well. Thanks.

Hi Tim, wondering if you can help me. Been following along. When I check the data in the dbo.Sale table, all of the 'Subtotal', 'Tax', and 'Total' fields show '4.2613', regardless of which items I select and regardless of their quantity, any idea why this may be happening? fixed - I had sale.Total = sale.SubTotal = sale.Tax; and I should have had sale.Total = sale.SubTotal + sale.Tax;

I'm now thinking of the possibilities of more than one register open. When checkout occurs, we probably need to verify that the amount in inventory is still available for each item before processing the sale. (This would be a good example of a typical racing condition, where one user gets to it before the other.) Although I can imagine this might not happen often in a store that sells hands on product, in a virtual sense maybe it could.

@31:36 There is a method introduced into a data model I would instead create a UserLoggedIn property. private bool _userLoggedIn = false; public bool UserLoggedIn { set { if(value == false) { Token = Id = FirstName = LastName = EmailAddress = string.Empty; CreatedDate = DateTime.MinValue; } _userLoggedIn = value; } get { return _userLoggedIn;} } Add this statement to the GetLoggedInUserInfo after the assignment of the token value. _loggedInUser.UserLoggedIn = true; Also, get in the habit of using string.Empty instead of "" By using string.Empty you're ensuring that the correct value is being used for the executing platform. If you're assigning the same value to multiple variables in a model using an assignment inline will save a lot of typing. Token = Id = FirstName = LastName = EmailAddress = string.Empty;

Hi Tim. Appreciate your great work! A question. Would it be eventually better to have a Method in the ApiHelper to Clear the LoggedInUser for us (where we already have access to the ILoggedInUser) instead of adding a Method to a Model Class?

Damn cool series Tim. I was thinking about what if the token expires ? That way the "IsLoggedIn" prop wont work properly. What would be the solution for that ? Do u create "/api/is-logged-in" endpoint ?

at 26:30 could it be that your method is just calling itself, and just keeps doing that ?

I know I'm like 3 years behind but . . . at 20:44 when we are working on the ResetSalesViewModel method we do "Cart = new BindingList();" couldn't we just do "Cart.Clear()" this is better for readability and probably speed/resources?

Thank you very much Tim. I got a question, you are resetting the ProductDisplayModel Cart to its initial products and Quantity, arent we meant to update the API with the current status of List, rather resetting it to its intial status ? I think this is where the inventory databse comes into play ?

Hi Tim. Thanks for the great video again. Is the source code for this video already on Patreon? I can't find it.

Hi, Tim. After we checkout, should we update the product quantity in stock in database? if user has purchased 1 product, the number in stock of this product would be -1, right? Thank you

I have a bug that is probably also in the official code in that if I log out and try to log in again I get the following error: "cannot add value because header 'authorization' does not support multiple values". It seems like I can fix this by moving IntializeClient() from the constructor in APIHelper to the beginning of the Authenticate method. Is that OK?

Hi . I love you videos . I have one or two questions . 1. This solution will work also with SQLite? is the same approach ? or will be a harder on implementation ? 2. What do you think about Fody/property change nuget package? thanks and keep up the good work !

Hi Tim, quick question, I noticed that there's another channel with your videos but just called "visual studio" is this channel also yours or are they impersonating you? If it's yours, what's the difference between both? That aside, your videos have been very well and simple explained, and obviously very helpful, thanks a lot for that and keep up the awesome work!!

Hi Tim...do you have a course on dialogs using caliburn micro? I see a few approaches out there but I like how you code with mvvm. Id like to see how you would do a dialog service (or something simpler) using caliburn micro.

Thank you for the video! I had a question rolling around for a bit.. It's a little out of the subject but I hope you could answer it! Is it possible to display data on a website from a database without having to refresh the webpage or pressing any buttons?

Forgive me for this silly irrelevant question, but I wonder if anyone knows the name of the font at the start of the video where it says CODE WITH ME. Thank you

Hi Tim, Why don't we update the QuantityInStock of products after we Checkout? I mean in the database. So, after we do ResetSalesViewModel, the Products have an up to date Quantity.

Once you check out the inventory is reduced by the purchased amounts. Yet the refresh of the products comes back with the pre-check out values - it is not calling the API to get the updated inventory.

Hi Tim this video got me thinking about the login events. Is there anyway to login when the enter/return key is pressed while focus is on the password box?

I noticed that you can remove more items than you have in the cart from the cart. I've tried to find a solution for it but I'm still new at this so no luck so far.

LogOut method should clear DefaultRequestHeaders of HttpClient because it keeps valid token.

By setting the cart to a new instance of a cart, won't that cause a memory leak? The original cart is still there, but a new cart has been created. With the original instance of the cart still having the items in it., that might stop the dispose method from automatically disposing that instance.

Hello Tim .. thank u for your tutorials ... I have a question..what about xamarin course ?

Hello Tim! Im getting empty values when i use the ILoggedInUser in shellView model. Even though it sets values in AuthenticatedUser class. And the Token value is also null could you please help me figure out why that is? Thanks.

how far is this course complete? I know you said in the first episode that it depends on comments ect... But i prefer to have a full course ready to watch instead of waiting 2 weeks for an new episode. could anyone tell me in short how far we are and what you learned till this episode?

If you Log off with something in the Cart, next time you login the Cart is not empty. I fixed this by making ResetSalesViewModel() public and then calling that from LogOut in ShellViewModel. Not sure if this is the cleanest way. public async Task LogOut() { _user.LogOffUser(); await _salesVM.ResetSalesViewModel(); ActivateItem(IoC.Get()); NotifyOfPropertyChange(() => IsLoggedIn); }

What did you use for DI?

Not working, Account Menu Not showing when login

How to be a patron

Some profit would be nice. Why else would you sell stuff?