Creating Objects Based On Database?
Jun 9, 2011
I have decided I would start small and make a program that would create a "receipt" list in a listbox and a total. Now, I would like the user to be able to add their own "menu" items. I'm assuming the best way to go about this would be to have them actually add it to a database and then a function in the program will refresh the dataset with the new list. However, this is where my problem lies. How can I tell VB .net 2010 that I want to create a new button (or buttons) on the fly, in an orderly pattern on the form, based on the input from a DB?
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Aug 5, 2011
I am looking to create an order reference which is something like this
PLC0000001
Where the 1 would be my order id
but lets say it gets to 100 would like
PLC0000100
In VB.NET how could I build up a string like where i know i.e.
the starting part = PLC
Ending part = Order ID
middle = fill in 0's
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Feb 26, 2010
I have an application I am creating that displays pump information based on customers in a database. I am using VB2008 .NET3.5.I have a combobox that has a selection for a unit of measure. What I want to happen is when that is changes the labels that have a unit of measure change to reflect the change. There are 15 labels total that need to be changed and all there names are the only ones in the project that start with a X if that helps at all.
I would like to avoid creating a bunch of labels and changing the visible property and just change the text value of each one. I have just started learning VB.NET
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Jun 18, 2009
I need to iterate a collection of objects. Based on a property value of the object, I need to group objects together. I also need a total count of each discrete property value. I do not know how many groups there will be and there could be 1 to n objects in each group.How do I do this? Are there algortihms that could help me out with this? Psuedocode or references are fine.
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Apr 9, 2009
i saw jim example in the codebank and i added the percent progress parameter to report progress method (to change the progress bar value)this is jim example:-
vb.net
Private Sub BackgroundWorker1_DoWork(ByVal sender As Object, _
ByVal e As DoWorkEventArgs) Handles BackgroundWorker1.DoWork
[code]....
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Oct 10, 2011
I made an object that has several properties one of which is an integer.
I put all the objects into a list, and I wish to sort that list by the integer property, with the object with the highest property at item 0, with the object with the lowest property at the highest item # ( count -1).
I made the list of that item, as in
Dim GameList as new list(of clsGame)
And I wish to do something like the following
GameList.Score.Sort()
What is the syntax to do that? I looked up the MSDN and didn't really understand what it was trying to say
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Apr 10, 2011
1) Add a Private variable named _area2) Associate the _area variable with a Property procedure called Area3) Change the CalculateArea method to a Sub procedure. The method should calculate the area and then assign the result to the _area variable.4) Include a parameterized constructor in the class. The constructor should accept one argument: the side measurement. After using the Public property to initialize the Private variable, the constructor should automatically call the CalculateArea method.At this point I believe I've completed the first 2 steps for the Square method, but I'm not sure where to go from therHere is my code for the Square class and the Main Form, in tha order:
Public Class Square
Private _side As Integer
Private _area As Integer
[code].....
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Nov 18, 2009
1. Write a Visual Basic Console Application which creates two DateTime objects. One DateTime object should be used to store a value for date purchased. The second DateTime object should be used to store a value for date paid. See below for more information.
2. Assign values to the two DateTime objects.
3. Use the toString method to display the two DateTime objects.
4. Compare the two dates to determine which date occurred first.
5. Compute the number of days elapsed between the two dates.
6. If the date purchased occurred before the date paid, display: The number of days required to receive payment was ________. Replace the _________ with the number of days computed between the two dates.
On the other hand, if the date paid occurred before the date purchased, display: The number of days this order was pre-paid was _______. Replace the _________ with the number of days computed between the two dates.
If the two dates are identical, display: The payment was received on the same date as the purchase.
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Oct 15, 2010
I am doing a internet cafe sweepstakes slot game in vb.net. I want to show the objects based on the payout and the prize money for paylines in the slot game. I tried using MT algorithem but it basically random number based. the final output should not be radom.
[code]...
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Jul 25, 2011
I'm having a problem at the moment developing my application. What i need to do is find out how many modems they are connected to my system and send data to each one in turn. I have the programme working for one modem at the moment.
So I can send data to a modem that i specify, for example a modem on COM port 1. I have functions already that will give me a list of COM ports that I need to open.My problem is that i want to dynamically create a new modem object along side existing modems and store them in a collection.
[Code]...
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Aug 27, 2010
I'm wondering on how you would go abouts instantiating a class that contains other complex objects. for example an Payment Class which has Date,Time, etc.. and it also holds a reference to a paymethod object which has id,Type,Description etc.. How do you instantiate the payment class with all the other objects without one or the other failing, how do you create the payment class which doesn
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Oct 4, 2010
I have a question. I have a class of Cars that I need to display in a simpli-ish string if they will be sold or not base on their number.
[Code]...
I'd like to display a simple string like this:Cars to be sold: 1, 3-5, 7-8, 11, which is based of the .Sell value.Is there some kind of heuristic to create this kind of string in .NET or is it just a bunch of for/each and if/then and redimming of arrays?
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Mar 17, 2009
I would like to dynamically create an object (in my case a thread) and then be able reference that object. Simplistically put, I would like to read from a text file and then process each item using a thread (so that I don't have to wait for each item before starting the next). The problem is that I cannot think of a way to create a new thread dynamically ie. thread name so that I can then wait for all created threads before doing something else.
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Mar 28, 2009
Is there a way to dynamically create an object at runtime?Background: Basically i have an employee class that i want to instantiate every time an employee logs in. What i don't want it to have an employee object already created for every employee, but when they log in the object gets created.
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Dec 16, 2011
Im considering making my own command line interface with custom commands etc. I was thinking the following objects would be sufficient:
Textbox - for input
Rich text box - for showing processes and output
Button - to insert input
If it can be done, how can I provide line breaks in the output on the rich textbox e.g.
line1: input instruction
Line2: <cp><textfile.txt>
Line3: I/O error, file not found, check file root.
My version of CLI will have no integration with the windows CMD.
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Dec 26, 2010
I have a Clients master object and then a number of child objects whose exact number is not known in advance such as Client-Contacts, Client-Payments etc, all of which have a one-to-many relationship with the Client master object.How do I define classes for such a scenario? Do I for instance create the master Clients class and can then I create an array of class somehow for child objects?
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Jan 19, 2009
I am having trouble assigning values to the properties defined in the mock objects.
Public Interface IAddCustomerView
Property FirstName() As String
Property LastName() As String
Property Message() As String
End Interface
My unit test below always fails saying that getMessage was never called:
<Test()> _
Public Sub Should_Display_A_Success_Message()
_presenter = New AddCustomerPresenter(_view, _repositoryStub)
[code]....
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Jun 21, 2010
I'm using VB.NET (visual studio) to create a chatbox (a program that mimics a human and has a text converstion with you). Two of my main classes are a word class and a sentence class. The sentence object is basically going to be a linked list of words objects. As the program executes, many word objects will be instantiated, and so will many sentence objects. But, each class (used to create the object) has several constants, procedures, and functions defined.
For each object instantiated, are new copies of the constants, procedures, and functions created in memory? Or, is only one copy of the constants and procedures created? Since many many objects will be created during program execution (each word of a sentence will be an object), that if the constants/procedures/functions are defined in memory again and again, that I'll run out of memory. What is the best way to structure my program so that the objects created contain only the variable data, and the constants/procedures/functions are defined only once?
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Feb 1, 2011
Is there any way to use a LINQ to XML to query an XML document like the one below to create new (anonymous or strongly typed) objects from the child elements of a descendant? Here is my XML document:
[Code]...
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Oct 25, 2011
I am in the process of learning LINQ to Objects. I am querying an array of reference elements using LINQ. In the code below, which I have marked with asteriks and PROBLEM, I am having difficulty returning any values for and I suspect its because of the multiple Select arguments.
'Program name:Querying an Array of Invoice Objects
'Created/revised:
'Project description:To demonstrate the use of LINQ to query objects
[Code].....
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May 16, 2010
I am trying to populate a dictionary with objects created from data in a recordset, but am having difficulty with VB's object referencing. I am very new to VB. Pseudo code of what I am trying to do:
dim dict as Dictionary
rs = getRecordSet
while rs.moveNext
set myObj = new MyClass
myObj.properties = rs.relevantFields
dict.add myObj.getUniqueKey, myObj
wend
However, all 'objects' in the dictionary are actually references to the most recently created (and thus last) object in the dictionary. I know why what I am doing above is not working, but I don't know the correct way to do it so that each element in the dictionary is it's own object.
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Mar 12, 2012
I'm creating a list of labels dependent on a few variables based on search results.Say I have 10 search results, 10 labels will be created within a for each statement, however I want to create subroutines for these 10 labels with an onclick event, is this possible
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Mar 30, 2010
I'm pretty new to the EDM, so bear with me. I have a windows form that has a DataGridView on it that's bound from the EDM I created. I figured out how to update my changes fine, but it's when the user creates a new row that I'm having a problem.I tried numerous ways and many google searches, but came up with nothing so far.
[Code]...
Error (occurs when calling _Context.SaveChanges()): Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. Refresh ObjectStateManager entries.
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Mar 31, 2010
I am retrieving an image from the SQL database into Byte() variable in vb.net
Dim img as byte()=dr(0)
How do I create a file in my C:images directory from the above img.
I want to read the img and then create a file with name bimage.gif
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Apr 27, 2010
I am writing a game editor, and have a lot of different "tool" objects. They all inherit from BTool and have the same constructor. I would like to dynamically populate a toolbox at runtime with buttons that correspond to these tools, and when clicked have them create an instance of that tool and set it as the current tool. Is this possible, and if so will it be better/easier than creating those buttons by hand?
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May 22, 2011
I've been working on creating forms and objects through code in the the load event of Form1, truthfully theres a few questions I have under this one category but to start I want to create a button click event that will check what button was pressed then set that button to a variable. I want the event to treat the button that was clicked like it was that buttons click event.Here's a shortened version of my code (Lol if you can call this short):
[code]...
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Apr 13, 2011
I am working on creating an application (game) for a PocketPC with Visual Studio2005 in VB/.NET. I try to dynamically create a (new)button upon clicking a label and assigning certain properties to this button. For this I used below displayed code, but this button does not appear on 'Form1' - which is big enough to display it- but creates an error: A NullReferenceException. Such occurs when you try to reference an object in your code that does not exist, but I think I just did by using'..New..' Who can tell me what is wrong and how to fix this? [Code]
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Aug 31, 2011
I don't know if this is doable, maybe with Linq, but I have a List(Of MyType):
Public Class MyType
Property key As Char
Property description As String
End Class
And I want to create a Dictionary(Of Char, MyType) using the key field as the dictionary keys and the values in the List as the dictionary values, with something like:
New Dictionary(Of Char, MyType)(??)
Even if this is doable, internally it will loop through all the List items, I guess?
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Nov 5, 2008
I have a website. In it, I have a button which will export some data from a SQL database to Excel. I want to open an excel workbook on the client and paste the data there. This all works fine locally, but when i publish it, I get this error:ActiveX component can't create object.[code]Have searched the net, and it seems the problem is permission related. Can anyone explain to me how to configure my server so that I can use clientside Excel?
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Apr 26, 2012
I have a array based on a structure that I want to build a datatable from. Here is what my structure looks like currently,
Public Structure QRQFiles
Public Complex As String
Public DescriptiveName As String[code]....
Since I have a structure with in the structure will I have to define two datatables to represent this?
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