How can we use the database objects from one form to another? Eg. In my Login form a person enters his user-name and password & if it is correct, the code directs him to another form(Form2). Now in Form2 How will I get which person has entered in?
View 1 RepliesI have a user control that inherits the FW ListView and I need to dispose of two objects when the form's disposing of it's objects. Here's what I've concluded already, am I on the right track?
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In VB.net how do you retrieve an value from a object in a different form.
eg:
' on frmMain
MsgBox ("Say ""Hello World"" Mr. " & frmOther.txtName.text)
If I have a large number of classes, each similar to the other in certain aspects (they all share a common base class, but each does things differently), and I need to create Windows forms for each to allow easy changing of their values through a GUI? Create one matching form for each object in VS' forms designer, Or Use code to create the forms dynamically at runtime.
#2 makes the most sense to me, because a lot of these objects will share very common features of the form, notably "Ok" and "Cancel" buttons. But one object might need to draw a textbox on the form while another might need to draw a combobox. Not to mention, if I want to put icons on the "Ok" and "Cancel" buttons, I'd have to do this for each copy of the form in designer, and that sounds like it could get out of hand quickly.But is drawing forms through code sane? VS' forms designer is pretty sophisticated and designed to make life easier. Am I wise to consider ignoring its functionality and diving into the trench warfare of forms design through code? Or are there examples of automating form creation based on an existing object's properties?
I want the coding for next and previous button and its given on my form. I want to fetch the records from my database and display it on my form.
View 6 RepliesI build my project and i got some problems. First i want to print barcode for books(toolstripmenu item). but i cant. here's the code that i found:
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second problem is printing again. i want to print my MS ACCESS .mdb from child datagridview's records.
third one i want to save and load(with dialogs) my database from main form to child forms' datagridview.and the last one is help provider. i prepare my own .htm help file, when press F1 it opens. but i dont know how to call provider to toolstripmenuitem and help provider keep my computer's path so when i call provider another computer, the programme cant find the path.
How To on a database driven login form. I'll include the Administration Backend to go along with it soon. Dial-Up users should not use this thread, it is image heavy
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I would like to use index of objects in vb6 to upgrade into vb.net, I have seen some topic but I could not do it
For exmaple(in Vb6)
Public Sub Update_PriorMenus()
'This sub read amoun projects and display in menu.
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In form frmAddPlayers I declare and create an array of pictureboxes in the Load event using the code:
Dim
pbxPlayerJoined(7) As
PictureBox
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In the watch window the value of the pictureboxes is System.Windows.Forms.PictureBox. Later in the load event I start a background worker in form sfrmUSBDevice using the code:
sfrmUSBDevice.sReadWriteThread.RunWorkerAsync()
The background worker waits for user input and then calls a subroutine from form frmAddPlayers. The subroutine changes the image in the picturebox to indicate that the user input has taken place. However when the debugger returns from sfrmUSBDevice to frmAddPlayers the watch window shows that all of the pictureboxes have a value of nothing. Then when I try to change the image of the picturebox I get an "Object reference not set to an instance of an object" exception. It seems like when the debugger goes to the sfrmUSBDevice form and comes back to frmAddPlayers the objects on frmAddPlayers have lost their information.
I'm translating a document management application from vb6. I want to program with good habits and technique, so I'm asking for your opinion really rather than just a solution.I have a decent understanding of OOP, but I'm not very experienced in VB at all. What I'm doing now is trying to figure out the best way to pass objects between forms.For example, in my initialization form, I have an object that stores a group of database connections. I need to pass this object around because reconnecting takes a significant amount of time. There are other objects such as user info and permissions.
Public Class Form 1
Dim DB = New DBobject
Public Sub Form1_Load
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Currently my program randomly removes words from a set of text and inserts textboxes below the text. The user can then enter his/her answers in the new textboxes. What I would like to do is set the program so the user can have two choices one being Easy and other being Advanced. Then when the user hits either button it brings up everything that is currently on the form. I'd prefer to do this without having to use MDI forms. I've had a hard time using the MDI forms and therefore would like to avoid using them. They way I was thinking this could work is all objects would remain invisible except for the 2 buttons and then when you hit one of them they disappear and everything else appears.
View 1 RepliesI need to dynamically access a bindingnavigator, is this possible? I basically want to have code in my Base form which enables or disables it's descendant's menu buttons depending on access rights.
View 2 RepliesCan you look at this code? It's a class module that I made so I can make our application more modular.
In the code there are 3 lines of code which have this as part of it: FormBrowseAttendance.ComboBoxLookupStudent.how I can change the coding to refer to this portion of code using these parameters:
pComboBoxName
pNameOfForm
I'm assuming these need to converted is some way but I don't know how to do it.
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i created a class i invoke the class as object in vb.forms i want bind object(parameters) to datagrid when return as arraylist from methods in form_load. i want to bind arraylist to datagird in form_load.it will bind, the grid show all the parameter from arraylist.but i want few columns to bind from arrylist.here arraylist is convert from list from method.
View 1 RepliesI am having a problem with objects that have other objects as properties on a property grid. Now when I display the object clsPropsFrame on the property grid, everything shows up as expected, except when I try to edit the x, y, or z of location which is of type clsPropsVec3, it ignores the change. What's strange is that when I type the vector in as a string (like "0, 16, 0"), it changes.
I have the following
'//////////////////Object Component///////////////////////////
<TypeConverter(GetType(ExpandableObjectConverter))> _
Public Class clsPropsVec3
Inherits ExpandableObjectConverter
Private refvec As TV_3DVECTOR
Public Sub New()
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I noticed that when I changed a component of clsPropsVec3, the property change in clsPropsFrame does not get executed. I tried making it fire of an event when a component is changed in clsPropsVec3, with the following additional
Public Property X() As Single
Get
Return refvec.x
End Get
Set(ByVal value As Single)
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But for some reason it ever fires off the ValueChanged event. So how can I make the sub properties of clsPropsVec3 work?
With VB6 and VB9, I continue to have problems displaying images on a form while playing wav files (either by API call or by My.Computer.Audio.Play method).I set up a loop to display pictureboxes on a form (card images), with a wav sound file that is supposed to be played each time a picturebox is displayed. However the pictureboxes won't display until after the loop finishes and the sounds have been played several times in series:Example
For I = 0 To 3
picBox(I).Visible = True ' picBox is an object collection of pictureboxes
My.Computer.Audio.
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how to make buttons and other objects move to the center of the form and possibly grow in size when form is maximized and also move back to its position when minimized.
View 2 RepliesI was working on one of my forms, not doing anything crazy or out of the ordinary, just adding a control to the form. When all of a sudden vb became real sluggish and barely responsive, so I closed VS and restarted the computer. Got back into my project and now I can't open any form. Opening a form gives me <b>failed to parse method 'InitializeComponent'. The parser reported the following error 'Error HRESULT E_FAIL has been returned from a call to a COM component.'. Please look in the task lisk for potential errors.</b>.Error list sometimes contains 102 errors, and sometime just one that says I have exceeded the maximum number of errors. When it contains 102, every single one of the errors is <b> [Object/Form] is ambiguous in the namespace [Project] </b>.
I can't open any designers right now, every single one of them gives the failed to parse method error. If I rename, lets say frmAbout to frmAbout1, then I can see that form.There is only one of everything in Solution Explorer, no duplicates. There are no duplicates in the folder either. I can open the code for each form/object and see it just fine, and looks fine too. Code is not duplicated or anything.
I am trying to create a form where depending on what the user selects, they are shown a collection of images from the web. Depending on what they select there will be a different amount of images so each picture will need to be added dynamically.
I am able to create PictureBoxes dynamically however I'm stumped how to create event handling in order for each control to give a unique response.This is what I originally tried but I got an error..
Private Sub Form1_Load
For i=0 To 10
Dim picBox As PictureBox
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The error I got was
'AddressOf' operand must be the name of a method (without parentheses)
How ridiculous that you can't include arguments in your AddressOf! Can anyone shed some light on my situation (or knows a better way of carrying out my goal)?
Im trying to make a radiobutton move diagonaly, (Dont ask why a radiobutton, i did it in college last week) For some strange reason though I need another radiobutton just going across the screen in order for my diagonal radiobutton to move.I would like to develop this into a game like pong, when I have gone further into VB.
View 3 RepliesI am relatively new to C# and winforms, although I have been using Java for years, so forgive me if im asking something relatively straightforward!I have a DataGridView, it needs to update regularly so I wish to provide a Collection of objects as its DataSource and NOT a database table.So far I have a List<MyObject> which will be constantly updated via a BackgroundWorker thread. I want my DataGridView to update when a change has been made to the List i.e. if the objects are resorted, added to or deleted from etc.Currently my DataGridView only displays the first object I add to the List, if I add more the DataGridView doesn't update to display the new objects added.This is a basic overview of how im coding it:
private List<MyObject> myList= new List<MyObject>();
myDataGridView.DataSource = myList;
Then my BackgroundWorker thread updates the list, e.g.
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I want to cycle through a arraylist and for each item in that list I need to create a picturebox, label1, label2 each with specific name attributes
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I wanted to ask you how I can make vb 2008 connect to web forms, fill them out & submit them all from vb 2008 objects/fields.
E.g. My vb form will have a gui that consists of textboxes, buttons etc... that will enter the data to web forms.
Here is Google accounts Sign-Up page & I want to automate the Sign-Up process: [URL]
Take a look at this Account Creator app. that automate sign-up & see if you can assist me on this: [URL]
All I need is for you to tell me how to connect to the fields on any webpage that I want from VB 2008 fields/objects to any Web forms fields/objects.
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):
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I'm writing a tabbed web browser for someone who is learning VB.NET, and I have got to the point where I can add/remove browser controls into tab pages, controlled by one set of buttons on the main form, but I can't handle events from the WebBrowser objects.I have tried this but it says that 'DocumentTitleChanged' isnt an event of 'Control'...
Dim browser As New ArrayList
browser.Add(New WebBrowser)
browser(0).parent = TabControl1.SelectedTab
browser(0).dock = DockStyle.Fill
AddHandler browser(0).DocumentTitleChanged, TitleChangedHandler()
I want to update the tab title with the web page title when it changes. I started using a timer to update the tabs but there must be a way to add an event handler here.
I don't know if this is even the correct terminology but I was wondering if it is possible to bind a row (of data) from a database to an object. I am working on a school project and we have decided to create this application to track a user's BMI/BMR and compare it to the amount of calories they have input. The program doesn't go too in depth so it does not store the calories consumed in the database.
So here is my problem. I have a row in my database:
First_Name -- Last_Name -- Height_Inches -- Weight_Pounds
And I guess what I am thinking I want my program to do is if I have an object with properties for FirstName, LastName, HeightInches, WeightPounds, is to somehow query the database for one row and put the values into the object. All we have learned so far is binding the data with controls which doesn't really help in my case since the work is going to be done behind the scenes.
in terms of speed and resource usage is it better to call the access queries using access.aplication or rewriting the database objects in VS? By using access there should be just one version of the queries, not two and access is more friendly for writing the queries.
View 2 RepliesPrivate Sub btnPurchase_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnPurchase.Click
Dim objCustomer As Customer
Dim objProduct As Products
Try
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1- why not just write queries those manipulate the database rather then creating objects, making changes and then going back to database.
2- now that i have got the new balance and the product oder has been made so every time this happens a query has to be sent to change database or there is any other better why of doing it?
I've just gotten started with development using Visual Studio (though this can be seen as a more language-generic question), and need done design answers regarding how to suitable relate a Database Entity/Table with an Class in-code.
Currently, I create a class who's attributes or iVars directly correspond to the fields in an Entity.
When I come to fetching all 'Customers from a Table' for example, I run a Select all statement against the database and for each result-row returned, I instantiate a new class Object where I use the Class' default constructor to set the instance variables. (I really wish there was a method like PHP's mysql-fetch-object()?)
I can then add each of these objects to say, a List(of Customer) and return it.
This doesn't seem like the best way to do it. If I were to change the Database schema, I'd have to reflect those changes in the class also.
I have a connection string set up and a data reader.I have two textboxes on my form for users to type in. One textbox (txtLogin) is a user name and the other textbox is a password (txtPwd). I'm trying to compare what a user types into those two boxes to a table in a vfp database. The table I'm trying to compare to is open about 99% of the time so I need to be able to read from it in some type of "shared" mode.
My Select statement needs to be something similar to "select * from sites where clogin = txtLogin.text and cpassword = txtPwd.text"I just don't know how to get this to work properly.