Asp.net - VB Equivalent Of C# Event Creation
Apr 12, 2010
I'm trying to extend the GridView class to always show the header and footer even when the datasource is empty by using the code I found online (link). However, the code is written in C# but I use VB.
What is the VB equivalent of the following?
public event MustAddARowHandler MustAddARow;
Is there a way around VB.NET not allowing events to return a type?
Also, I cannot convert the following function because of the error below.
Code:
Protected Function OnMustAddARow(ByVal data As IEnumerable) As IEnumerable
If MustAddARow = Nothing Then 'Error on MustAddARow'
Throw New NullReferenceException("The datasource has no rows. You " _
[Code]....
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May 11, 2009
I just want to know if there any equivalent event (ADO. NET VS 2008) event as in MS ACCESS Form's OnCurrent Event.
The reason is I like to make some calculations based on some data bound controls with current datarow data when user clicked a row in DataGridView (or by using bindingNavigator). I've tried with DatagridView's RowEnter event. But some Data bound controls are not yet reflect the data of current datarow when that evet was fired.
In MSDN Help File: It says "RowEnter Event: Occurs when a row receives input focus but before it becomes the current row. "
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Jul 27, 2010
I'm trying to monitor the creation of files from macros I have launched from VB.Net. The code below works and the event fires but nay code I insert in the OnChanged events gets this error:Error 7 Cannot refer to an instance member of a class from within a shared method or shared member initializer without an explicit instance of the class.
The error message makes no sense to me. I just want to call a SUB() on the same form or make a call to me WP class as shown. How do I do that?
Imports System.IO ' WP
Imports System.Diagnostics ' WP
' WP Monitoring
[code]....
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May 29, 2012
I'm migrating a VB6 application, which has a subroutine that fires upon a QueryClose form event. As far as I can tell, this event no longer exists in System.Windows.Forms. I tested with a breakpoint, and QueryClose does fire when you click the red 'X' in the upper right corner of the VB6 form, like the FormClosing event is supposed to do in VB.NET forms. My question is: Does FormClosing have the closest equivalent functionality to QueryClose, or should I use a different event? [code]This code was originally VBA / VB6, which I put through ArtinSoft's Visual Basic Upgrade Companion (VBUC). VBUC apparently didn't think that there is an equivalent event, or isn't smart enough to do that sort of conversion. FWIW, I'm using Microsoft Visual Basic 2010 Express.
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May 26, 2010
I'm working on a tutorial to build a media player in Silverlight and am trying to wire up an EventHandler to the timer.Tick event of a DispatchTimer object so that the time of the video is synced with a Slider object.
The sample code is in C# and I can't for the life of me figure out the proper syntax in VB.NET with RaiseEvent and/or Handles to wire up the event. Below is the relevant C# code. I'll include comments on where I'm getting stuck.
[Code]...
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Sep 11, 2009
In WinForms I could handle the Validated event to do something after the user changed text in a TextBox. Unlike TextChanged, Validated didn't fire for every character change; it only fired when the user was done.Is there anything in WPF I can use to get the same result, an event raised only after the user is done changing the text?
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Feb 2, 2010
I have got a dgv which on clicking a cell or row triggers the row_enter event, this in turn fills a list which is then placed as the datasource for the datarepeater. Heres the event which works within a dgv
Private Sub dgv1_RowEnter(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles dgv1.RowEnter
Dim NameList As New List(Of TestList)
For Each item In Example.Item(e.RowIndex).Names
[code]....
Now this is all well and good but i need a way to do this using a datarepeater. I have tried about 5 events to get something like e.RowIndex and have been unable to find any event that would let me use this routine?
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May 29, 2009
I am new to VB .NET, but not to DLL creation (C++).I am trying to create a DLL using VB .NET (2008) and I need to execute some code when the DLL loads. I am trying to do this in DllMain, but I don't see how to get DllMain to execute when the DLL is loaded. I don't see anywhere that the DllEntryPoint can be set in a VB .NET DLL.
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Apr 19, 2010
I want to create a new DB2 Databse When My Application Start First Time tell me the solution for this.i have create database command but it can't run.
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May 23, 2010
I am using Microsoft visual basic 2010 express edition and i am having some trouble with my web browser i have gotten everything to work except for 6things.How to make the source code appear in note pad when i click view source
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Jul 31, 2010
I've read thru Iceplug's tutorial on control arrays and got it working. I tried to add a new event by basically copying his click event code and calling it a doubleclick event. I used the proper addhandler and assigned the correct name to my sub. I have the click event changing the background color to blue and the doubleclick event changing the background color to green. The background color does not change to green. Why?
Heres the tutorial with my new code encased in asterisks ...
Code:
Imports System
Imports System.Windows.Forms
Public Class form1
[CODE]...
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Sep 27, 2011
I have a files list which contain the directory of file. I want to know file creation date of that files. I used fileInof.CreationTime. But It is not displayed creation date. How I can know about this.
[Code]...
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Oct 12, 2009
So I am attempting to do the following: Use VB to select multiple Files(Excel, Word, RTF, PDFs) and create one PDF from all these files. I need to perform this for approximately 2000 files with a different number of files going into each PDF. I have Acrobat 8 and Visual Studio 2008.
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Apr 19, 2011
how can i write <p> <br/> hello this is my creation </p> in xml file while i am creating it by the use of asp.net .
it is showing <P> text </P>
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Mar 6, 2010
i wants to create an dll (classlibrary) file for displaying selected data form database by using a gridview control.for this iam creating an dll file , in that how to declare gridview1 [code]
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Jun 5, 2011
I'm doing INVENTORY project...
front-end : vb.net
back-end : Access
I'm having PURCHASE, SALES tables...
In sales form, i need to create CONTROLS during RUN-TIME...
i.e, when we gone for shopping to a DEPARTMENT store, we buy LOT things... they will give us only one BILL... when they are entering BILL, they will enter only CODE of the product, all the other particulars will be loaded automatically... if v buy 10 items, there will be 10 items in BILL... if it s 15, 15 in bill...
i need to create like this only...
i.e in SALES form, CODE, CATEGORY, BRAND, S.P, DATE, QUANTITY, TOTAL etc., are available... when i click a BUTTON say NEXT, the controls specified(CODE, CATEGORY, BRAND, S.P, DATE, QUANTITY, TOTAL) has to be created automatically, in same size,and in same COLUMN (in form)(i.e CODE is a COMBO BOX, WHEN I PRESS NEXT another COMBO BOX has to be created in same COLUMN), whenever i press the NEXT...
and also, when i press SAVE BUTTON, ALL THE DETAILS HAVE TO BE STORED IN DATABASE...
I know the concept of CONTROL ARRAY... but i don't know how to implement in vb.net...
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Feb 12, 2010
how to create a windows application in vb.net
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Mar 7, 2011
I have a form that requires 5 columns of textboxes that the user will populate. By design I will provide the first row but, the user will need the ability to add or delete subsequent rows. Is there an easy way to approach this requirement?
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Aug 12, 2011
I need some input refactoring an asp.net (c#) application that is basically a framework for creating dynamic forms (any forms). From a high level point of view, there is a table that has the forms, and then there is a table that has all the form fields, where it is one to many between the two. There is a validation table, where each field can have multiple types of validation, and it is a one to many from the form fields table to the validation table.
So the issue is that this application has been sold as the be-all-end-all customizable solution to all the clients. So, the idea is whatever form they want, we can build it jsut using DB configurations. The thing is, that is not always possible, because there is complex relationship between the fields, and complex relationship between the forms themselves. Also, there is only once codebase, and this is for multiple clients - all of whom host it on their own. There is very specific logic for each of the clients, and they are ALL in the same codebase, with no real separation. Sometimes it was too difficult to make it generic, so there are instances where it has hard coded logic (as in if formID = XXX then do _). You can also have nested forms, as in, one set of fields on its own within each form.
So usually, when one client requests a change, we make the change and deploy it to that client - but then another client requests a different change, and we make the change and deploy it for THAT client, but the change from the earlier client breaks it, and its a headache trying to debug, because EVERYTHING is dynamic. There is no way we can rollback the earlier change, because then the other client would be screwed.
Its not done in a real 3-tier architecture - its a web site with references to a DB class, and a class library. There is business logic in the web site itself, in the class library, and the database stored procs (Validation is done in the stored procs).
I think this is a bad model in general, because one of the things I heard one of the developers say is that anytime any client makes a change, we should deploy to everybody - but that is not realistic, if we have say 20 clients - there will need to be regression testing on EVERYTHING, since we don't know the impact...There are about 100 forms in total, and their is some similarity in them (not much). But I think the idea that a dynamic engine can solve ALL form requests was not realistic as well. Clients come up with the most weird requests. For example, they have this engine doing a regular data entry form AND a search form.
There is a lot of preserving state between pages, and it is all done using session variables, which is ok, except that it is not really tracked, and so sessions from the same user keep getting overwritten, and I think sessions should be got rid of.Should I really just rewrite the whole thing? This app is about 3 years old, and there has been lots of testing and things done, and serious business logic implemented, so I hate to get rid of all that (joel's advice). But its really a mess of a sphagetti code, and everything takes forever to do, and things break all the time because of minor changes.
I've been reading Martin Fowlers "Refactoring" and Michael Feathers "working effectively with legacy code" - and they are good, but I feel they were written for an application that was 'slightly' better architected, where it is still a 3-tiered architecture, and there is 'some' resemblance of logic..
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Jun 11, 2010
I ran into a little problem where my thread(s) tries to access a control that may not be created yet. How can I check for this or is there a way to force the creation of the control(s) first and then go on or any other solution?
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Jul 25, 2009
ok so heres what im trying to do. I have one form with a textbox and a button. im trying to make it so that when you type in the word "internet" a new form will be created and it will have the following components inserted onto it;
one webbrowser
one textbox
eight buttons
im not really having a problem making a new form so much as having a problem putting the tools on it, heres what i have
Dim screensaver As New Form
Dim back As New Button
Dim forward As New Button
[Code].....
vb doesnt say i have an error or anything like that, but i cant create "internet". i can create the form but cant put any of the components on it.
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Apr 11, 2007
does anyone know where i can get visual basic 5.0 control creations edition???
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Oct 1, 2010
Now i am doing a vb.net desktop application, In which i have to construct GUID. Eventhough having a built-in function in our VB.NET like "System.Guid.NewGuid.ToString()" to get GUID, I need to create the GUID in 30 digits in the below mentioned criteria through vb.net.
Application constructs the GUID (30 digits) using the information from the 5 different sources. The different sources are Current system time, millisecond of the system time, Process ID for the application, system physical memory status and finally the group object identifier number.
8 digits
4 digits 8 digits
8 digits 2 digits
[Code]....
I am not sure how to get the above values to construct the GUID?
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May 6, 2010
When we create an inherited control then is the Designer still needed or not? Should usercontrols be disposable?What is the difference of using Base and Me when we are setting default properties of our usercontrols?[code]
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Apr 8, 2010
setup wizard creation in wpf
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Mar 9, 2012
I am trying to create a entry in already existing registry key, my program is executing properly but DWord is not being create in registry.
Below is my sample code.
Dim rkey As RegistryKey = Registry.LocalMachine.CreateSubKey("SOFTWAREMicrosoftWindowsNTCurrentVersionWinlogonSpecialAccountsUserlist")
rkey.SetValue("poweruser", 0, RegistryValueKind.DWord)
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Aug 27, 2011
Since interface provides 100% abstraction over its members then why we are allowed to define a class inside an interface? We can define class inside interface, even instantiate it and call its members ,why? I am not getting the clear picture over this .Why this is allowed and what can be its implication or benefit.[code]
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Mar 30, 2009
I am using VB.NET for Windows applications. What is the difference between Load event,Activate event and Enter event in the Form and in which order the above event is executed.
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Jul 20, 2010
I'm trying to validate a few things in a form I'm building. It has a datagrid with clients info (taken from an access database) and a few textboxes where the user can type some search criteria. The thing is that those same textboxes are used to add new clients to the database and to modify a client's information if one from the datagrid is selected, so I made it that the buttons to insert and modify clients are disabled on load and thenevery time the text on a textbox changes ("TextChanged" event) they become enabled. So far so good. But then I wanted to make it so when a client from the datagrid is selected both buttons become disabled again until the text on a textbox changes (to make sure they're adding a different client and not the same one that was
selected).
I tried using the CellClick event from the datagrid to disable the buttons, but since every time a client is selected from the datagrid the info is shown on the textboxes, this triggers the TextChanged event too, and the buttons become available.So, is there a way I can tell the TextChanged event not to be triggered when the CellClick event occurs?
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Jun 10, 2009
I am trying to code a simple background workers class without needing to use the backgroundworker object on a form. This would allow me to use a background worker in any class without writing much additional code. Is it possible to pass in the name of a sub at runtime instead of hard-coding it? To do this I would replace onDoWork and onProgressChanged below and use (Byval onWorkSub as SomeKindOfObject?, Byval onProgressChangedSub as SomeKindOfObject?) instead. [code]
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