I have created a datagrid of my own in vb dotnet and converted to dll. I add this dll to a project.i have 2 forms and i have added this control on 2 forms. When i run the project and open 2 forms simentaneously an error " reference not set to an instance of an object" occurs on acess of any property of that control.
View 3 RepliesI'm just starting out using vb.net and i am writing my first application. I have added some comboboxes at runtime to my form using the code below.[code]Now my question is now that i have these controls added to the form, how can i iterate through them all and collect the values for sql injection. I have given each combobox a specific name when it was created such as Ball1, Ball2, Ball3.[code]
View 4 Replies1. What determines that some controls cannot be added to the form? (I tried several, not all of them)
2. Where does the image for Column 1 About form come from?
I am currently wokring on a project, which is going to serve as an interface for accessing various documentation and reports. It is basically just a tabcontrol with a few pages that will be poppulated with buttons which will open the appropriate document.I am trying to allow administrative users the ability to add new, edit or remove buttons which all seems relatiively simple, but have run into the problem of how to persist the changes once they are made. I want the setting to be stored centrally, either in a SQL table or on a network share
View 1 RepliesI am trying to make a small control that has a picturebox and a few labels that can be dragged on the form it is placed on. The control was easy, and I can drag it fine when the mouse is down on the control, where there are no other controls, like not over the picturebox or labels.
When i try to click and drag the user-control and the mouse is on the picture box or labels of the control the mouse down event is not detected. I am hoping someone can tell me how to pass the mouse-down event from the controls on the user-control so the form I place it on detects the mouse down even no matter where on the control i click.
I have created a usercontrol. I would like to add one of these user controls per record in a recordset.
I have almost all the code created ready, and the control ready and available for use, however i can not find how to add the new control.
How do i go about this
I have my user control contained in a project Continuous_Form_Control1, called UserControl1.vb
I understand the page lifecycle and how i need to add the dynamic controls on page_init if I want to take advantage of viewstate. Also I know that I should try to avoid dynamic controls when possible. The dynamic controls are created depending on an object that is created from custom event arguments sent from a custom treeview. Problem is I need viewstate so I need to create them in page_init but I don't have the event args to create the object that tell me what controls to add until later in the lifecycle.
Private Function GetEventArgs() As npTreeViewEventArgs
Dim control As Control = Nothing
Dim e As npTreeViewEventArgs = Nothing
[code]....
I use this in page_init to create my object and controls.
I have a custom control which I add a number of to a flowlayoutpanel:
Dim drive As New WindowsControlLibrary1.UserControl1()
drive.FileSystemlable = reader.GetString(2)
drive.AbalableSpaceLable = Convert.ToInt32(reader.GetString(4) / 1024)
drive.TotalSpaceLable = Convert.ToInt32(reader.GetString(5) / 1024)
drive.SetVolumeLable = reader.GetString(3)
[Code]...
I created a control so that I can add label, txtbox and checkbox during runtime. I was able to do this successfully but after this, I need to get the state of this checkboxes every time the user check it, RUNTIME.[code]...
View 2 RepliesHow do you refer to controls that are added at runtime e.g. I can add a combobox and a handler, but trying to reference the controls name in code gives an 'not defined', error so in my example, the control is visible, but I cant populate the combo box or use it in anyway.
View 2 RepliesI was trying to make my program see if facebook.com was running in internet explorer.
I added the following
Private Function isFaceBookOpen() As Boolean
For Each ie As SHDocVw.InternetExplorer In New SHDocVw.ShellWindows()
Dim filename As String = System.IO.Path.GetFileNameWithoutExtension(ie.FullName).ToLower()
If filename = "iexplore" Then
[code]...
And added reference; Microsoft Internet Controls (COM tab) but i also need to add this reference; Microsoft.mshtml (.NET tab)
Problem is that i can't find that reference. BTW, I want the function to be triggered by a timer.
I have a number of user control dynamically added to a page, and user interaction with these dynamically added user controls need to be handled by the control's parent. Is this what is referred to as "event bubbling"?How do I do that in VB?
View 3 RepliesWhen I add or modify controls on the form the graphics are redrawn many times over.The more graphics that are drawn the slower the machine gets.
View 1 RepliesI am creating a program which allows the user to add some buttons during runtime. Each button can be moved, sized and added to any tab on a tabcontrol. What I would really like to do is binary serialize a class that contains the properties of each button including which tab it's on.
View 4 RepliesWhat I have is a user control that has two RichTextBoxes. In the user control, there is RichTextBox1's TextChanged event, I want it to set RichTextBox2's Text to the same as RichTextBox1's Text, I'm currently using: RichTextBox2.Text = RichTextBox1.Text. The user control is on the main form, when I run the application and type I get this error: StackOverflowExecption was unhandled. [Code]
View 4 Repliesi am wanting to add handler for controls i add at Page_load at page load i added several image buttons and applied the image urls using -i used the borderwidth propertiy for padding as was having trouble getting a cssclass to work. [code] what i want these Image button to do is when clicked a larger image in another panel will appear so i will need to assign the clicked buttons image url to the large image controls, image url
View 2 RepliesI get values from web service:
Dim ctr As Integer = 100
Dim ctr2 As Integer = 145
Dim ctr3 As Integer = -2
[code].....
I want to ask a question about adding controls in design time (controls may be any win form control or a user control) and adding the control in run time.
View 2 RepliesI've dynamically added 20 pictureboxes to a panel and would like to see the panel scroll when I use the mouse wheel. To implement this I have tried to set the autoscroll to true on the panel control. Here is the code.
For i As Integer = 1 To 20:
Dim b As New PictureBox()
b.Image = Nothing
[Code]....
It works for "button" control, but not for the "picturebox" or "label" controls?
How can I implementthe scrolling affect using 'mousewheel'?
I am building a program that does inventory control. I have multiple forms connected to same database. One of the forms I have a search function. When I was using the controls at the top of the page, it was working. I added buttons for the controls and now the database wont store anything. I can open the input form and I can add multiple inputs, close the form, open it back up, and nothing left in the database. I have also noticed that my database icon in the data source has a small red X in it. When I click on the icon, it is showing the db as closed. I can refresh it and it opens, until I run the program and it closes.
View 4 RepliesThere is newer code in a follow up post. I suggest using the code in the later post rather than the code in this one. You can still read this post though. When designing a user interface, one should be conscious of how many individual controls are required to implement the functionality. In some cases an initial design may begin with many buttons or textboxes (for example) but then further review of
the actual required functionality allows for a reduction in the number of unique controls.
But other times, there isn't a better way (which will still make sense to the user of the application) then to have a series of many repeated controls. So in the cases where one can be certain that the best UI implementation for an application will require the use of multiple copies of a given control, then it often becomes necessary to maintain some method of managing all of those controls at various points
throughout the application. Doing so typically requires that one build up some collection of controls which can then be accessed by index in order to work with any given control; but this can lead to a lot of clutter in the code file which handles these control's events. For instance there will be some kind of collection declaration, some recursive routine to find all of the controls of interest, and then any number of event handler methods with long lists of Handles clauses, or additional code loops to wire up the event handling for each control.
Purpose Since most of this functionality could be considered a requirement regardless of the type of control being managed, or its required functionality, it may make sense to wrap all of the control management functionality into a single class. And since our first requirement is a collection of controls, then a base collection class could be the perfect starting point for our control manager. There are a number of existing thread around this topic, with some recent (at the time of this writing) ones being:[URL]..In this, and related, threads I have posted examples of a simple TextBoxManager and ButtonManager control. But again, with so much similar functionality required regardless of the control being managed, it would be technically possible to create a generic ControlManager(Of T As Control) class which can manage any type of control.
[Code]...
So in summary, one can facilitate managing a large number of user interface controls by building a "control manager" class which both encapsulates the list of control instances, and deals with adding and removing defined event handlers for every control it manages. The generic control manager class itself can be inherited and extended into a more specific class on a per-application basis in order to provide more application-specific functionality. Reed Kimble - "When you do things right, people won't be sure you've done anything at all"
I have a query about dynamically added controls to a form. I have a series of buttons which are created and added at run time. I have a two drop down lists and two buttons which are created at design time. Button 1 creates a series of buttons called "Test 1.x" based upon the selection of the two drop down lists. This works fine and am happy with the logic.However.... Button two should remove all the dynamically created buttons from the form.This does not happen. What does happen is that 50% of the buttons are removed starting with the first one. WHen checking the loop it only enters the loop half the amount of times that there are buttons. Very strange. When the loop is run repeatability it will remove all controls. Why will my logic not remove all the dynamically created controls at once? What is wrong with my logic?
I attach two code snippets and the .net file for your consideration.Button method which creates the dynamically created buttons from the two drop down lists and adds to form
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim Count As Integer
Dim MaxHours As Integer
[code]....
Public Class aaMyForm
Inherits Windows.Forms.Form
Added some controls. Build it, add the .DLL as reference to my other project.
In my other project:
Imports MyLib
Public Class XForm
Inherits aaMyForm
The events from aaMyForm execute correctly but the controls added to it are not shown on XForm. I have found some info about set Modifiers Protected in order to be able to change the functionality of the controls but havent found anything about why the controls aren display on the XForm.
I have 2 project (A and B). A is the main, B its child.I added the B referencie in A to use its forms.When i run B, there is no error.When i run A, i can launch B, but in B all my Controls are Nothing
For example : B.frmMain.btnTest.Text is Nothing in B.DialogBoxTest when B is used in a referency, otherwise different of Nothing.I use Visual Basic 2008.
I am trying to create a custom control using vb.net.I have added a image to the user control and the problem I am having is that when I resize the image, the image seems to move as well.I want to be able to resize the user control height without moving the image on the user control.
everytime I resize the user control, it seems to move the image on it as well.Is there a way of leaving the image where it is without moving it as the user control moves?
I've searched until my eyes and fingers feel as if they are going to bleed. I cannot come up with the answers I'm looking for. I want to essentially create an inventory system without using a database (part of why the eyes are bleeding, keep getting directed on side tangents), that is fed by the user. IE, User enters a name of a product, it is added in to an array. As a designer I will not know the exact number of elements to be held within the array. The user will enter their chosen item in to a text box. So I'm looking for a way to take the value in the text box and add it to the array. I believe I would use the reDIM function to do this, but beyond that I've got nothing. I'm unsure of how to reference the value stored in a text box.
View 7 RepliesI have the following code on a form named: frmRegister.The aim of this form is to add a new user to a database. However, currently the code exectures with no errors and the success MsgBox is displayed, but the user is not added to the database.I can't seem to pin point the error.[code]
View 1 RepliesI have some custom user controls in my .net winforms program that do not display correctly when the user has selected larger text size. This setting:
My controls look like this:
Instead of like this:
The bill to area and ship to area are both custom controls. I don't know if this is contributing to the problem but I do have code in each to scale the phone/fax areas to stretch nicely, like this code from the bill to control,
Private Sub panFaxPhone_Resize(sender As Object, e As System.EventArgs) Handles panFaxPhone.Resize
panFax.Width = (panFaxPhone.Width / 2) - 1
panPhone.Width = (panFaxPhone.Width / 2) - 1
panFax.Left = panFaxPhone.Width - panFax.Width
End Sub
How can I get my controls to size correctly while still respecting the users choice for larger text (I don't want to just set the AutoScaleMode to None)? After playing with this for a long time it seems to be a problem with anchors in the child controls. See this below image, the inner black box is the control with its border turned on, the text boxes (like name) are anchored left and right and should stretch to fill the control, but don't.
i have a windows from project and in that project i created a user control lets call itcustombutton1 now i can use that control quite easily either at design time or runtime by creating a new instance of it like
View 1 Replieshow would I go about creating a payment schedule based on a date and a number of months 3 or 6 or 12 to then populate the database with reoccurring dates so lets say new user added on 31/10/2011 for 6 months I need the database to add all the dates for the six months
[Code]...