I also went though the whole "ASP.Net in 24 Hours" book by Scott Mictchell. I followed everything that went on in that book and built the final project successfully. I also used the tutorials here to better understand the whole Membership Provider/User tables setup that was going on in the book. Next, I thought I would learn more about accessing data for ASP.Net since that is what most application do.I went through the first Data Tutorial here. I seemed to understand what was going on just fine.The second Data Tutorial seemed to just show a lot of VB code to build the Business Logic Layer. There was not much explanation about how to do it yourself.I think I can keep going in the tutorials here. I downloaded the code from the second tutorial and went through it.I am guessing that the code in the second tutorial was given just to proceed with the overall project that is being built throughout the tutorial sequence.
I have a shopping cart ListView control backed by a custom object that has methods for selecting and deleting. In the ListView, one of the columns is an ImageButton that is essentially a delete icon, with the CommandName parameter set to CommandName="Delete".
My issue is related to updating the shopping cart ListView on delete; as the delete method is stored in the custom business entity object, I am having trouble in terms of updating the calculations made inside the cart (we have deleted an item, so I need to recalc shipping, taxes, etc).
I am generally following this tutorial, the main differences being I'm using 2008 R2 Express and Windows Forms, he is using 2005 & ASP.NET Web Site:'m building a minimalist Windows Form project for learning purposes. So I'm using a 1-table database with 2 columns, ContactID & Name. I added a dataset file, 'ContactsDataSet.xsd' to my project and added a single minimalist table adapter with just a fill() & getdata() method.Then I added a DataGridView control and connected it to the ContactsDataSet to confirm it was working and that worked fine. I ran it and it filled up with data as expected. Everything up to this point was auto-generated code.
I have an application that does complex calculations for members. Each member can have multiple US states linked to their profile. Each state has got different calculations for each course a member completes. As of now I have been performing the calculations in the DB (SQL Server 2008) and then sending data back to app layer where they can see their history and then download a certificate for each course. I have a business logic layer but not a lot happens there. I know this has been asked a lot but where do you think I should perform these calculations: business layer or database? I am going back and forth
If code the parameter list as seperate arguments then this wouldnt be a problem, but following a taught pattern that i should take collection as parameters in update or create methods.
Assume the there are three members in a class and in the update or create methods that was told code them to take collection, therefore create.
update methods of that class take collection but the problme the caller faces that it doesnt know the order and names of each element of the collection.
i am currently trying, to create some sort of a business logic within my class, that contains information about a machine, now this machine once sold, can be re-sold by its owner. the company needs to keep track of the machine and its owner for warranty claim purposes.the class takes in two values, a from date and a to date.now when a new owner is added to the owner collection of the machine, the TO date of the previous owner should automatically be updated to one day less than the From date of the new owner that is being added.
I have tried searching all over the web for this logic. Got many but half of them did not match what i was looking for and half were malfunctioning.I want to calculate business working hours between 2 datetime, where in I should be able to set the working hours as well as weekends and holidays should not be calculated.
I have several successive web pages going through a checkout process and they each have tons of business logic that time restraints limit me from pulling out and wrapping up elsewhere in the code the way it needs to be. What would be a good method for calling each one of these pages' Submit buttons in order from one page to the next?
The way I was going to do this was to (laugh at me go ahead) make PUBLIC all of the submit buttons' code and just call them. But what I have found is that all of them have, of course, certain calls to controls on their pages where it might make a label visible or change a text property then that will crash the app due to a null reference. I believe it is basically saying if the webpage is not visible then it is not going to let the code start setting certain GUI properties of the controls on the page. It seems like I recall this in VB6, too.
Anyway, what would you do if you were in this situation? I have started down the path of creating a flag that says whether or not I am in expresscheckoutmode and, if so, it just doesn't do the "illegal" things mixed into all of the code like making labels visible and all that. But that also means that I have an IF BLOCK everywhere where the code simply changes a label. It junked up the code bad and I still haven't finished that implementation of it all. I wanted to come here to ask the collective mind what programming principles I can best apply here.
IN my daat access layer, the stored procedure returns value of the format "CCT1". But i need to format that value to "CCT00001". Should i do this formatting in the data access layer or in the business layer?
How would you structure a large project with most of the business logic already inside stored procedures?We are moving from classic ASP to ASP.NET (VB) and pretty much all the business logic is inside stored procedures.Getting the logic out of there is pretty much impossible since my boss doesn't want to (too expensive, takes too long, no "real" added value).I was thinking about making a presentation layer made of aspx pages, a business logic / data access layer that would basically get the data and interact with the existing stored procedures and a business entities layer that would be made of classes (for entities and collections) containing the information to interact between those two layers.The reason I wanted to make those layers was to be able to reuse most of the code without duplicating it.
my form displays locations and owners for a same product, the forms have a data grid view that actually takes in the details of the location and owner of that particular product. a product can have multiple owners and locations once its manufactured over time, the forms actually display this all i need is some kind of business logic that can actually manage the historical events of the location and the owner that when a user actually goes in and adds a new entry, the end date of the previous owner gets reduced to one less than the start date of the new owner. this in formation is stored in business layers called the owner collection and the location collection, i am not able to actually inherit or call the location or the owner collection class in the classes.
My question is, am I able to share a business logic layer seemlessly between the two presentation layers or is there anything I need to watch out for. I'd really like to not have any duplication of business logic, so any advice would be more than welcome.
using an object-binding I have a an object representing "Employee". The employee has an ID-property. The ID of the employee must be unique.
My validation of the entered data is handled in the property set part of the object. In general, I validate criteria belonging to the object to validate only (eg numeric range of the ID, if it's value is not empy, ...). But in this case I need to know all ID's from the other employees. My tried this:
I am working in VB.NET defining my own classes. I have 5 classes, Policy, Coverage, CoverageCollection, Layer, and LayerCollection. Policy has a bunch of data items, one of which is of type CoverageCollection. Coverage has a bunch of data items, one of which is of type LayerCollection.
Policy private id as Long private name as String[code].....
Then I do like "dim p as Policy". So, iIn order to get to properties on a Layer, I reference it like p.cov(0).lyr(0).face. What I am trying to do is add a readonly property to Layer that is calculated using some Layer information but also using something from Coverage (or even Policy). I can take this in as a parameter to the property, but I think there should be a way to get at Coverage/Policy information since I am "under" it already. Is there a way to do this?
regarding your book "Pro Bussiness Applications with Silverlight 4" there is something that makes me cumbersome. I'm Talking about getting results from a query in code behind.uppossing you are using WCF RIA Services, you are always getting Nothing as a result due to asynchronous mecanism betwwen Server and Client.I've tried to use a BusyIndicator like this (VB), but it doesn't work:
dim ctx as new DomainService1 dim query= from p As Entity1 In Ctx.GetQueryEntity1Query select p If ctx.IsLoading = True Then
I am using Oracle 11g client, with ODP.NET. I am trying to add conditional Transaction handling.
Dim ds As New DataSet() Dim txn As OracleTransaction Dim _beginTransaction as Bolean = true Using conn As New OracleConnection(ConnString)
[Code]...
How do I fix txn being nothing / null? The error is: Variable 'txn' is used before it has been assigned a value. A null reference exception could result at runtime. Edit: to RichardOD for pointing out that you can not explicitly declare that a transaction cannot be opend up on stored procedures via ODP.NET. I have verified that this is an issue. BUT We still haven't figured out why the error is occuring. I understand that txn is initially given a value w/in an if statement, but being defined outside of the try/catch block should make that irrelevant.... right? Or is that bad coding?
TDD is supposed to have 100% code coverage. Does this mean one is supposed to write tests for property getter and setters, and other methods that contain no real logic, such as dealing with external API functionality? Below is one example method (which happens to also be the example in this other SO question which deals with how best to test it, if we are going to test it). This method doesn't do much. It's a facade of theSystem.ServiceProcess.ServiceController functionality of stopping a service. Currently this code was not being written using TDD, but if it was, would it be something that one should test? There is very little logic here.est to test it (IoC & Adapter Pattern vs. Detouring) please see this other SO question.
Public Function StopService(ByVal serviceName As String, ByVal timeoutMilliseconds As Double) As Boolean Implements IWindowsServicesService.StopService Try
I am trying to prototype an application with a data layer on my computer at home using Visual Basic 2008 express edition with SQL Server Compact 3.5. My production situation at work is SQL Server 2000 and I am using Visual Basic 2005 professional for development.I am trying to write the code to create a seperate data layer. Here is my code. First the data layer:
Imports System.Data Imports[code].....
My Problem is that the data does not show up in the text boxes.
The application uses ADO.NET to invoke sprocs for nearly every database operation. Some of these sprocs also contain a fair amount of domain logic. The data access logic for each domain entity resides in the domain class itself. ie, there is no decoupling between domain logic and data access logic. I'm looking to accomplish the following:
Ok, so I was playing around with Ninject, a "Service Layer" and a "Repository Layer".I built a simple console application to to play around, this is what I came up with:
Imports Ninject Module Module1 Sub Main() Dim Kernel As IKernel = New StandardKernel(New CustomerModule) Dim Service = Kernel.Get(Of CustomerService)() Console.WriteLine(Service.GetCustomerByID(1).Name) Console.Read()
I am attempting to create an application for my (very) small businessRight now I am trying to create an "Add a Customer" formI know VERY LITTLE about MySql so I thought I would save the text into a textfile.. I then realized I do not know how to save multiple text box in a text file (I only knew how to save one text box in a text file)
This is a debate that can never be fulfilled without you. Please come forward and respond.What if we have a client who wants to develop a web enterprise application (based on SAAS architecture) and prefers for C# and not VB.NET based. Argument can be:
1. C# is better suited for developing enterprise application versus VB.NET
2. C# is object oriented versus VB.NET is not
3. Programming in C# is faster than VB.NET
4. Libraries/function blocks in VS.NET is more for C# versus VB.NET
I would request you to help me answer this. I believe this is the type of questions many faces when deciding for which language to go for, both developers and organizations.
Due to a discussion in another thread , I am starting to use business object in an 3-Tiered windows app. As a starting point, I am trying to build objects/classes on a table from my database.
The issue I'm currently having is mapping multiple GUI fields to object properties (i.e. Presentation layer to Business Logic Layer mapping). To be more specific, this is in VB.Net 2.0 WinForms. The nature of the solution requires us to have 4 columns which exhibit the same type of behavior on our GUI - each column consisting of 11 textboxes (we'll just use this small sample size, as the problem extends beyond 11 textboxes).
What I am currently doing is setting the tag of each textbox in all four columns to a value like so:
As you can see this can get very bad, rather quickly. Currently we're setting 43 some odd properties that can be mapped to -- thus that select statement is extremely long -- many of which are embedded in multiple methods to try and attempt DRY (I've watered down the code to essentially a conceptual implementation).
Question is: how can I refactor this? I've attempted using a dictionaries/hashes to a certain extent, but it either became overly complex, or just plain didn't make an implementation sense as it convoluted the problem even more.
I have a form which has two panels each containing there own controls (Pnl1, Pnl2). By Default I want Pnl1 to show and Pnl2 to be hidden which I have set but I want Pnl2 to sit ontop of Pnl1 so when Pnl2 is selected Pnl2 is Visiable and Pnl1 is hidden. Therefore Pnl2 and the controls sit in the same place as the controls in Pnl1. I have got everything lined up but as I move Pnl2 over Pnl1 to sit ontop, Pnl2 is moved into Pnl1 and becomes a Panel within the Controls of Pnl1. Therefore when I hide Pnl1 everything is hidden as Pnl2 is part of Pnl1.
I was having a discussion with a colleague about a method used to check business rules. In general there are two conditions:
"If one fails the whole thing fails"
Example 1: "If one fails the whole thing fails"I have used the following technique for condition 1 in several cases. Essentially if one of those conditions is false then the whole thing fails
Dim blnTemp As Boolean = True If Fail=False Then blnTemp = blnTemp AndAlso False {code code code}
does a big business in shirts, especially for groups and teams. They need a project that will calculate the price for individual orders, as well as a summary for all orders.The store employee will enter the orders in an order form that has text boxes for customer name and order number. To specify the shirts, use a text box for the quantity, radio buttons to select the size (small, medium, large, extra large, and XXL), and check boxes to specify a monogram and/or a pocket. Display the shirt price for the current order and the order total in labels.
Include buttons to add a shirt to an order, clear the current item, complete the order, and display the summary of all orders. Do not allow the summary to display if the current order is not complete. Also, disable the text boxes for customer name and order number after an order is started; enable them again when the user clicks on the button to begin a new order. Confirm the operation before clearing the current order.
When the user adds shirts to an order, validate the quantity, which must be greater than zero. If the entry does not pass the validation, do not perform any calculation but display a message box and allow the user to correct the value. Determine the price of the shirts from the radio buttons and check boxes for the monogram and pockets. Multiply the quantity by the price to determine the extended price, and add to the order total and summary total
The assignment also requires a pop up message "Daily Summary" with total shirts sold, total sales, and average sale per customer.So far I have this as my code but I am not sure what needs to change in order to display the correct total shirts- mine only displays the last accepted shirt order.
I am writing a program that takes a shipdate and generates a timeline of deadlines for a manufacturing job by working backwards from the shipdate. I hav no problem handling weekends. However, some holidays are giving me problems. For holidays that don't have a set date (Thanksgiving, Labor Day, Memorial Day...) what is the best way to determine the date they fall on? Most of the examples I have seen use an array of dates (either from a file or hard coded) for these holidays. Is there a way to do this tha won't require someon to generate a list every year for these holidays?
