C# - Architecture: Maintaining Order History
Aug 12, 2009
I am working on a new domain model for an application that will have order processing for items built in (well, too keep it simple for this question anyway). I have a class "VendorItem" that represents items that can be ordered. Originally the "Order" class was going to have a list of VendorItems associated with it, but I have come across problems with it so far.
Let's say that the system has been creating orders for some time just fine. One day a user comes along and decides that a vendoritem has changed price or some other detail like packaging size. I wouldn't want the previous orders to be affected by such change. At first wash I was going to make a "OrderLine" class that is basically a copy of the "VendorItem" class, but that just feels (smells?) wrong in the OO sense. Is there a better way to refactor this so I don't have copies of classes and information in the domain model?
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Jul 24, 2009
I have made an employee list and linked it to an Access database. The initial problem I was having is that in my program I had to link their ID's and names so if you click on an employee in the listbox, his or her's ID would automatically display in the textbox below. Since I did not know how to do so, I decided to make an array and store the ID and names separately while the listbox is being compiled. And so, the form became linked and adding became easy to code.But my problem came in deleting an employee. When deleting the name should be removed from the list, but this is where the order of the arrays messed me up. How do you maintain the order of the array? Here is the code I used. I dimmed 'count' as an integer and it is responsible for keeping that order.[code]You will see Staff_CodeTextBoxes etc. and info_Staff_CodeTextBoxes. etc.These text boxes (not visible to the user) are responsible for holding the data while the array takes the data from it, or adds it's own data to it.
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Mar 25, 2010
I'm using visual basic 2008 and really need help in this question ...
-I'm creating a web browser : how to stop adding pages to Internet Explorer History...
-And auto save/open Listbox (so i could use my own browsing history)
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Aug 5, 2009
I am in the process of converting an in-house web app to a winform app for disconnected reasons and I hit the following snag.
[Code]...
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Jun 12, 2009
I need to build a program that combines many different .doc files based on which check boxes the user selects. At first I was going to use the word.document.open(file) way, but I would rather not have to open 40 different files every time the program runs. I then turned to streamreader, which works great for basic text (after I convert the file to .txt) but I can't figure out a way to maintain hyperlinks. I am now thinking that after the streamreader reads all of the data and combines it into one string, it will paste it into a word doc and somehow search for hyperlinks and make them active.
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Aug 4, 2009
My program references a specific object that is contained in a list. The references point directly to the object itself, instead of its position (index) in the list, since that might change over time as other objects are added/removed. However, occasionally this object is edited, and (behind the scenes) this sometimes involves replacing it with a newly-created object (so the code looks like ListA.item(i)=new testobject...). In which case, if my understanding is correct, all the program references to this object are no longer correct, since they point to the replaced object instead of the new one. So I'm wondering how to maintain the integrity of the references, since the list index is not permanent, nor is the object reference technically permanent. Should I create some ID number for the object, and maintain and use it for references (so the new object would get the old one's ID)?
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May 24, 2012
One of my programs uses transparency so that the form is the shape of the background image (.png). My problem is that everything works and looks fine on the computer I'm developing on (Win7) but when I run the program on my other computer (XP), instead of the transparency I get the background color (which is the same as the transparency color). Does anyone have any experience this problem?
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Jul 30, 2009
I have three radio buttons defined within a frame (optRptType_0, optRptType_1 and optRptType_2). I set the checked value to true on optRptType_2 to use as my default. I have the following checkchanged event defined for these radio buttons
[Code]...
When the form opens the optRptType_0 is checked. I am trying to determine why the optRptType_2 is not checked as that is the default I set up. I tried adding the line "Me.optRptType_2.Checked = True" to the Form Load event but it had no affect and the optRptType_0 is still the entity checked when the form opens.
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Jun 21, 2010
I am converting decimal to binary by:
Code:
Dim i As Int64 = Convert.ToInt64("2")
TextBox1.Text = Convert.ToString(i, 2)
[code].....
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Mar 6, 2010
I have the [B] [I] [U] buttons and they work to a point but here is the problem I'm having.In MS Word,I can Hilight text and select Bold and it bolds the text, I can then select Italic and while leaving it bold, it Italicizes it.I can then click the bold button again and it will remove the bold but leave the selected text Italicized. I can't figure out how to get this action to work.I know I can OR the styles to apply multiple styles to the text but I don't know how to remove a style while maintaining any others applied.Here's a section of code that I'm messing with.[code]....btw, I am using for the comments so that the code is easier to read.I have tried (in this specific segment) newFontStyle = currentFont.Style And Not FontStyle.Bold
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Mar 28, 2012
I have an issue with maintaining scroll position.I am almost positive that I have everything set correctly. I have updated my web config...
<pages maintainScrollPositionOnPostBack="true"
and everything seems to work fine UNTIL....When ever my Gridview returns a lot of pages, like more than 50, sometimes upwards of 100 or more, I show 50 records per page. The farther into the Gridview, the more the scroll position is off.So what I am saying is that for the first 20 plus pages or so, if I scroll down the page to the point where the top rows have moved off the screen and I enter Edit Mode, the correct record remains in view on Postback.But if I am over say around 30 pages into the Gridview, the further in the worse it gets, when i enter Edit Mode I have to scroll back down to the location of the record that I selected to edit.
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Nov 23, 2008
Q1)My ASP.NET VB Script will write long writings - like many thousand words into my Access DB but i have previously had problems with the text containing characts such as '.Is there a way of inserting such?
Q2)When I read a database field in consolidates it into my string variable on a single line. What variable type should I use to have it maintain the line spacing and stuff.
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Mar 19, 2012
I Have a web form in a asp.net web form 3.5. The listview has a checkbox on the item template, I am trying to retain the state of the checkboxes through pagination . Once I can page through records and preserver this state I need to send this to a print page which takes those ids...I have this working, but it will print only the records on each pagination. [URL]
how can this be done, the code below is not working.
Protected Sub ListView1_ItemCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.ListViewCommandEventArgs) Handles ListView1.ItemCommand
Dim myButtonPrint1 As Button = CType(ListView1.FindControl("printButton1"), Button)
If e.CommandSource Is myButtonPrint1 Then
[Code].....
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Nov 6, 2009
I was wondering does anyone know where i can find some good books and or articles covering the architecture and design of OOP applications. Also I need a book that explains how to structure an application as it relates to the data tier, business logic tier, and the front end.
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Jun 3, 2009
In the first comment (by J.W.) to this question: Using ObjectDataSource and DataObjectTypeName, How Do You Handle Delete Methods With Just An Id Parameter?, it is said that using ObjectDataSource is a bad design. What is considered good design for well-architected ASP.NET applications?
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Nov 12, 2010
To write a effecient Active Directory library to ease the work of technicals who are responsible to create access models into the domain controller's Active Directory. This library must allow the following:Basic operations: Add, Modify, Delete, List entries;An entry may either be an organizational unit, group or user (no further need required as of now);I thought about having a class which would represent the domain with which we want to work with.
public class Domain {
public Domain(string root) {
Root = root;
[code].....
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Aug 10, 2010
We have a small visual basic 6.0 application with an Access DB that we would like to migrate to modern code and architecture. I am not technical, but I am believe this would be something like a .net framework with a SQL Server DB.What I am wondering about, is there any way to covert this code to a modern language/architecture? If so, what is the easist modern language to migrate to?
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Dec 25, 2009
what is a disconnected architecture in dot net?Why are the dataSets a disconnected architectures in dot net?
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Nov 1, 2009
When trying to determine the Architecture of an OS, I ran across IntPtr.From reading the documentation, I saw this: Quote:The IntPtr type is designed to be an integer whose size is platform-specific. That is, an instance of this type is expected to be 32-bits on 32-bit hardware and operating systems, and 64-bits on 64-bit hardware and operating systems.
Since the size of IntPtr is intended to be the size of the architecture, would it be feasible to test the size and determine the OS by that? Or is there a better way?
I was thinking there might also be a way via WMI, but I don't want to use that for compatibility reason.
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Oct 4, 2007
Is there a way to programatically determine if the OS Architecture is 32-bit or 64 -bit?
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Nov 1, 2009
I have a combo box bound to a datasource. I need to change one combo box (of many) to order the items in descending order.I'm guessing I could order the collection in the dataset, but that will mean all my combo boxes will be reordered?
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Apr 17, 2010
I have a databound Datagridview. The DGV is bound to a datatable of a strongly typed DataSet created using the wizard. Is there any way to re order the columns before displaying them eg: the Columns are displayed in the DGV in this other Col4, Col6, Col3, Col1,Col5, Col2
But I want to it to show as Col1, Col2, col3, Col4, Col5, Col6?
I realise that the display order followed the Column order in the database table and by extension, the datatable. I have re-arranged the columns in the Database but the Datatable still retains the old order.
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Nov 5, 2009
I need to write an app that that will iterate over our database, and perform various anaylsis on each record. In order to do this (partially for the learning exercise in creating plugin support) I want to use a Plugin model.
Currently, I have a simple Interface in my main app, which plugins can Implement. My app then loads all DLL's in a folder looking for ones implementing the Interface.
As you can see in the pseudo-code below, I have to keep performing a loop through all loaded plugins calling the process methods.
Sub ProcessData()
For Each Record In MyDataSet
For Each Plugin In MyPluginCollection
[Code].....
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Apr 14, 2010
I am beginner in programming and developed an application of mine. Although, I am finished with the coding part, but I have to present my software architecture diagram. I am not a software engineer and so familiar with basics of software engineering, layering etc.I have used 1) .NET GDI Graphics in my application, 2) Text to Speech, 3) RichTextBox which retireives pictures etc. How do I proceed with the architecture diagram now?
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May 23, 2011
I have a large application that has always existed all in a single .NET project up until recently (200,000+ LOC). I'm finally getting to the point where I can fix this. I just started using the Entity Framework (4.1 using code first) and I believe this is a good time to start seperating my logic.
What I did is I separated my application into three subprojects:UI - Windows forms project Business - The POCO classes Data - Legacy data access code AND the DBContext class to connect my POCO classes to the database. I also have a Windows service project and will soon have a WCF project, but those concern me less.
The problem is that in this plan, the data layer depends on the business layer and vice versa causing a circular reference error. There is no way around this.So, my idea is to move my POCO classes into the data layer removing all business logic first (just keeping the database fields, basically). Then, I will inherit from those classes in the business layer adding back all the business rules. Then my data access layer will not rely on any other project, the business layer will rely just on the data access layer, and the interface layer will rely on both for now but eventually only on the business layer.
Does anyone see any problems with this, or a better way of doing things given my current circumstances?
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Jun 6, 2011
Explain Singleton architecture of Remoting.
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Jul 20, 2011
I need help in understanding this architecture. The person who wrote it is long gone and I'm stuck to figure it out. We are creating an object in some code from some random workflow in the web application (unimportant for my question). The object is being instantiated from a class found in a Designer.vb file. I couldn't initially see the file until I clicked the "show all files" in Solution Explorer in Visual Studio. There are 3 files linked together.. a *.xsd file, a *.Designer.vb file and a *.xsx file. The *.Designer.vb file looks to be auto-generated.
Goal:Get dbo.note.text from the dbo.note table column and place it in the dbo.exportnote.text column. I just don't understand how it's connecting to the database and getting the data from the dbo.note.text field. I want to make the query more specific (possibly put a where clause on it). But really I just want to understand how it's communicating with the database. Most of the code uses stored procedures. So I'm confused on the architecture. What would be really cool is if you can explain how this code was autogenerated. It appears that the *.xsd file is an XML file when I "View in Browser" from the Solution Explorer.Code to instantiate object of designer class:
[code]...
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Oct 21, 2009
Using VB.NET 2008 I want to know what is 3 Tier Architecture for windows application? How to make a code for Inserting, Deleting, Updating in a database using 3 tier architecture.
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Oct 8, 2011
This might not be so 'VB' as it is 'SQL using VB' I have an application with a built in MS Access DB. I have a table that has a column full of integers, I shoot the DB a SQL "order by 'column name' " string and it returns the table ordered by my column of integers.BUT it returns them like this, and I want them like this
0 6
1 5
2 4
[code]....
How do I get the OrderBY to do a descending list starting with the highest number?
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Aug 18, 2011
I'm working on the exercise page 73 (VB 2010 in 24 hours). It's basically a form with 2 text boxes, 2 text labels and a command button. It's really simple and uses this loop to cycle through the items, and tell me the name of them in a Messagebox
[Code]...
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