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?
View 23 RepliesI am just wondering how to force the creation of a handle of a control before the form that it is contained on is loaded... I have tried:
[Code]...
i frequently have troubles with the dock property. it seems that either the order of creation or adding to the parent control determines whether or not a control's dock property supersedes another's. e.g. a control with the dockstyle fill will overlap with another docked control on the same parent. does anyone know what the rules are to determine how docking will behave; particularly in dynamically created GUIs?
View 2 RepliesI want to make a new RichTextBox contorl when a new tab page is created. I also need that control to be the child of the tab page. I created a class for the tab control. And a class for the RichTextBox control. I dont know how to start this. I have made a class for the RTB because I figured I could override the sub new procedure but you can't so i just declared it as public and set what I needed it to do. But it doesn't work.
View 1 RepliesI want to make a new RichTextBox contorl when a new tab page is created. I also need that control to be the child of the tab page.
I created a class for the tab control. And a class for the RichTextBox control.
I dont know how to start this. I have made a class for the RTB because I figured I could override the sub new procedure but you can't so i just declared it as public and set what I needed it to do. But it doesn't work.
i have issue with simple thing
Dim TblPans As List(Of TableLayoutPanel)
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Try
TblPans.Add(New TableLayoutPanel)
[Code]...
I am trying to make a program that will include a drag/drop view where you can arrange objects around in a view and add/delete objects as needed (objects are actually controls I create dynamically), I have made some code which I include below.If I run this code it works but not the part when I click on a newly created control, then mousemove function is not used, I should be able to move controls using the mouse functions..but these do not work. I thought code like:
AddHandler logicif(i).MouseMove, AddressOf logicif_MouseMove
should work! Can anyone give me pointers on what I am missing?
Public Class Form1
Dim logicif(20) As Panel
Dim count = 0
[code]....
Normally I can get the webbrowser control in my vb.net application to scroll using the following code after the webpage loads into the webbrowser control: WebBrowserPageView.Document.Window.ScrollTo(50, 50)
But when the webpage uses the dom to update the page after the page loads, the scroll bars will scroll for half a moment to 50,50 but then snap back to 0,0.
I'm working with the webbrowser control because I've had so many problems with using a non wrapped browser.
What I'm doing is filling out web forms, pressing submit, filling more information, etc etc. The problem is that when I press the submit but inside the code, the webbrowser doesn't actually reload the page so the second step of form filling can never happen.
From what I've read I think this is because it's simply loading from cache. Is there someway to stop this from happening such that when the submit button is pushed, and the server sends the new page, the webbrowser reloads it automatically?
I have a webbrowser control built into a windows form of my application and I was curious if there was a way that any links that are clicked on in the webbrowser control will be forced to open in a new browser window?
View 7 RepliesI have a data point with a y-value of 1 being plotted, the MS Chart control will use increments of 0.2 on the y-axis. How can I force it to not use a decimal, keeping in mind I will have values of >100 so I can't just force an increment of 1 on the y-axis?
View 1 RepliesUsing the walkthrough from [URL], I implemented a DatagridView in virtual mode, totally unbound, in VB 10 Express (we are talking WinForms).
I understand that CommitEdit (DataGridViewDataErrorContexts.Commit) commits the current cell's contents to the data cache.
The example uses row-level commit, i.e. it pushes the values into a row buffer until the current row is left. Only then the row is added to (or updated in) the data store. That's exactly what I do, too.
Question -- how can I commit the current row programmatically without leaving it? (I want to commit the whole row, not just the current cell.)
If the user leaves the row, there is a RowValidating, RowValidated, RowEnter event sequence where the datastore update is taken care of. So one idea (currently my only one) was to simply re-set CurrentCell to Nothing, for example.
But I cannot just set the DataGridView's CurrentCell property to Nothing (or any cell outside of the current row) since I want to commit from within an event handler of a custom edit control created by a custom column, and I see an System.InvalidOperationException exception when setting CurrentCell there.
In fact, it is a tiny button right to a combo box, i.e. I create a DataGridViewComboBoxCell descendant which is a DataGridViewComboBoxColumn descendant's edit control. My special ComboBox cell adds a tiny button which should commit the current row. Unfortunately, that button's _Click event handler cannot change CurrentCell since DetachEditingControl throws the exception then.
Obviously, I must delay the CurrentCell re-assignment until the whole _Click event has been processed. Or what? How would I do that -- register a custom Windows message, SendMessage that one to me, and override the windows procedure of the form so it re-sets CurrentCell when this message is received? (Hello?)
There should be a rather easy way to let DataGridView commit all changes by firing the events that I handle to perform the datastore update, no?
Just getting started in VB.NET. I would like to add X-number of text boxes at run time. And then be able to address them by their index or some sequential numerical value (like an array)
This is what I have so far:
CODE:
When I turn this into a loop to create multiple toolboxes, how do I assign a name to the controls, or will all of them be named "MyTextBox" ? I'll increment their position so thats no problem.
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.
View 9 RepliesI 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.
View 3 RepliesI 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
View 4 RepliesI 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]...
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]....
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.
View 2 Replieshow 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>
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]
View 1 RepliesI'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...
how to create a windows application in vb.net
View 3 RepliesI 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?
View 19 RepliesI 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..
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.
does anyone know where i can get visual basic 5.0 control creations edition???
View 3 RepliesNow 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?
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]
View 4 Repliessetup wizard creation in wpf
View 2 Replies