For some reason now, when I start a new project in Visual Basic 2008, I can no longer add any new controls to the forms. All controls are grayed out in the toolbox. What can I check to see what's causing this?
View 1 RepliesI 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]....
I would like to know how do .net developers manage a large window application with a large number of controls, such as textbox , button, groupbox? I have seen a number of people do it this way : declare the controls as an array and initialize them one by one at run time . In this way it is easy to manage those controls because they can be accessed by array index; but this solution seems to require very good understanding of control's attribute such as its location, font etc. This could be a difficult task if the project is passed on to a less experienced developer and add changes to it.How do you deal with it?
I am developping a VB.net application. I would like to add buttons on the MDI but every time I open a child form of the MDI, it appears down the buttons. Is there any way I can solve this problem?
View 3 RepliesI am trying to build a NOTEPAD/WORDPAD like application with vb.net on visual studio 2008.
I need an option to define and choose (MsWord, or CSS like) paragraphs styles, such as: "heading1", "green quotes", etc.
How to increase a forms opacity without increasing the opacity of the controls in the form?
View 1 RepliesI have a 8 bit Gif, that is transparent, with controls sitting on top of it, all in a custom control. This part works fine. However, This control is a menu ring (appears around another control with a few options). The transparent part is over a Picbox, that is in a panel. The transparent part of the image seems to skip the picbox and go right through to the panel. I set the panel to a back color of RED. The custom control when its placed instead of showing the image in the pic box that it is on top of, it shows the RED panel I have made sure all my Z orders are right.
View 5 RepliesI'm creating a reporting application, and our customers are going to need to generate some pretty big reports which require quite a bit of memory. Ive been in a re-factoring mood lately, so I was wondering what the best way to access the properties of another open form would be(The reporting viewer opens in a new form.) So far I have:
Dim form As MainSelections
form = My.Application.OpenForms(2)
yay or nay.
*Edit - I should probably mention that what I need is a label, two date time pickers, 5 datagridviews and a few datasets. Those cotrols have the info I use for my parameters
I have a thread running on a child form, I want to activate a control on the parent form but cannot. It works fine if It's done from the child forms UI thread:
(FormMain.SetControlPropertyValue(FormMain.RBSQL2005, "Checked", True))
but not from a thread running on the child form:
Public Class FormRestoreDB
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim t = New Thread(AddressOf UpdateListView1)
[code]....
If I load a datatable, and then set a listbox properties pointing to it, I get the right data, e.g.:
[code]...
I get System.Data.DataRowView instead of my actual data.I don't understand how the databinding is actual happening, and how I refresh my the data in the control when the data changes.
we all know how to dock or anchor controls so that they resize themselves accordingly when a form is resized. It works fine till we have rows of controls on left and right size of the form. But what if have three columns (Columns as in visual sense. I'm not talking about any column control containing other controls) of controls? For example a form having a bunch of controls in the left side, a bunch in the middle and a bunch in the right. There may be a few more bunches in the middle. Now while resizing the form, I want the controls to resize accordingly as well as change their positions to make space for the previous bunch of controls that are resizing.
I mean, while the user increases the form size horizontally, the controls of the second bunch should resize and at the same time they should move right because the controls of the first bunch are increasing horizontally too. When the user decreases the form size horizontally the same thing should occur in the reverse order. I can manage it somehow using nested split-containers but that's too cumbersome. I would like to know if there's some better way to achieve it, like setting some property etc.?
I have a simple UI form with some controls (textboxes, checkboxes, datagridviews etc.)
The form communicates with an object that contains the values that should be displayed in the controls.
I am trying to group various controls (of the same type, e.g., labels together, buttons together, etc.) on a form using a tag or a name of some sort so I can identify all those that belong to tag 'A' and those in tag 'B'. In the end I will have on a form a number of labels grouped as tag 'A' and some labels as tag 'B' so I can change their visible properties on/off.
View 4 Repliesim am working on a form with a few textboxes and buttons, the problem is when the form is resized or maximized the controls stay small. If someone could please show me how to resize the controls as the form is being resized.
View 2 Repliesis there any way that i can set the property of a control all at once? like for every button, i want their backcolor to be red. something like that.also is it advisable to set the properties of a control in design view rather than code it? does it have any performance issues?
View 3 RepliesI tried rewriting one of my old VB6 projects today. I keep getting stuck. I know that default instancing from VB6 is pretty much gone in VB.net. I have several forms and modules. One form is nothing but a form with a progress bar. When there is certain workload that particular form shows up and displays activity (via progress bar) and then is closes until there is more relevant workload in the app. In VB6, with several of my sub-routines (in my modules) I was able to control the progress bar value by simply referencing it this way: WorkForm.ProgressBar1.Value = (value goes here). This does not work in VB.net since WorkForm itself and any controls on it are considered private. I have tried creating instances of the "WorkForm" via "Dim wForm as New WorkForm", but even then "wForm.ProgressBar1.Value" does not work and I keep getting "'wForm.progressBar1' is not accessible in this context because it is 'Private'."
In fact when I try accessing any control on any form from my various sub-routines all I get is: "is not accessible in this context because it is 'Private'"By the way, is it just me, but after a few days working with .NET framework I realized that it seems pretty web-centric. It seems the whole idea of .NET is to push the apps from the desktop onto the web. I mean, if I rewrote my app to use only a single form up front, I wouldn't be having these problems. But then again, it wouldn't be a desktop app, it would be an app that could be easily embedded into a webpage. Is this the general idea? I am definitely not rewriting my app so it uses only one form. This is a desktop app and multiple forms are necessary.
Does anybody use the Tag property of controls & forms? If so, what for?
View 6 RepliesI have setup some base forms with some bottons on it The buttons are situated in a panel.Both the panel and the buttons modifer properties have been set up as "Friend".The problem I have is when I inherit these base forms, the buttons seem to jump around by themselves allot
View 6 RepliesVB.Net Windows forms feature controls that are often dragged from the toolbox onto the form. The code for the control goes right into the form. Usually this is great, but is it possible to write the code for a UI control (like a panel) into a separate file which can then be imported or otherwise included into the main Form Class?
Context (a.k.a. long version): I have a form with an unchanging column of navigation buttons on the left hand side. The rest of the form is taken up by different panels, which in turn have different controls of their own. Clicking the different buttons on the left should cause these different panels to appear (clicking button "A" brings up panel "A"; button "B" brings up panel "B", etc.), but the left-hand menu should stay unchanged.
I'm having a hard time implementing this design in an elegant way in VB.Net. If I make each panel a separate Form, I have to duplicate the code that builds the unchanging left-hand menu in every file, which is terrible. I tried using inherited forms so the separate panels would inherit the left-hand menu from a master form, but that means each click on the menu sprouts the new form in a new window, and although the left-hand menu is inherited, the menu that I clicked and the identical-looking menu in the new window are not the same objects in memory and have no knowledge of each other.
I just want one window with central content that changes based on what you click on the left-hand side. A solution to this would be for the panels to be just that - panels - and not separate forms as I'm currently doing it. But this gets messy organizationally because the code for all of the panels has to be in the one massive master file. Hence the short form of my question (see above): How can I code a panel in a separate file and then bring it into the fold of the main form?
I'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 editing an application that was developed using VB .NET. The form has a button, I see it in the code but it is not visible in the Form. Also, when I place a new button, it comes as Button2 meaning there is a Button1 - I am not sure how to find where it is and place it at the right place.
View 2 RepliesI am trying to write general function to set the attributes of the command button and want to access this function from any forms.But I am getting error in this function.[code]
View 1 RepliesI have a basic windows form. I have one command button of the default size right in the middle of the form. I also set the anchors for the command button to keep it in the center when the window form is resized.The issue is when I maximize the the window form the command button remains in the center, but it has grown in size tremendously (almost taking up the entire form).I want to keep the command button centered when the form is maximized, but I also want to keep it the same size. Is there a property for the command button I am overlooking which will do this?
View 1 RepliesI have a form with 2 contols that I with to connect by drawing a "wire" on the screen. It goes like this: you mouse down on the first control then move the mouse while holding the mouse button down. When the mouse is over the 2nd control the mouse button is released and the controls are wired.
So I am playing with mouseup, down, move, etc. When the mouse is over the first control I get mouse moves from that control, but when it moves off the events stop, and I get no events from the form even though the mouse is there.
Is there a way to do this? I have seen it done in a Java app. I could brute force it and just draw a box on the form instead of a control, but that sounds like a step back.
I'd want to get names of all controls of of all forms of my application. How can I do it?
View 2 RepliesI am performing a migration on a vb6 program, to vb.net. The basic knowledge you need to understand this question is that there are two forms that need to talk to each other, frmInput1 and frmInput2. I have the following code (behind frmInput1) that checks if a textbox on frmInput2 has a certain value, seemingly before it has loaded:
[Code]...
I want to create a table with 2 fields (FormName, ControlName) that consists of all form names and all control names (within that form).[code]...
How do I loop through all forms and controls in my project?
I have a lot of forms set up, probably about 10-15 so far (more to come). Some forms 'lay' on top of other forms, and each form contains multiple controls. I am discovering that my approach is not very likely to succeed in what I am thinking of doing.
Here is one example: LeftControlPanel form contains 5 controls, but 5 other forms 'lay' on top of it and use transparencies to load up bitmaps. Since I cannot parent the forms that 'lay' on top of the form, I cannot figure out a good way to move them.Is it logical that when I move LeftControlPanel to a different x location, I would just move all the forms that 'lay' on top of them as well?Seems like a clunky approach of moving one form since parenting the transparency forms will remove all the transparencies that are set up...
Is there a bit better logic I might be missing, or bite the bullet and start moving multiple forms at once?
I am a student and i am making a windows application in vb.net 2005. My project requrement is to print form's specific area and also provide left, right, top and bottom margin. Itwill also print in multi page if it require. For that i used Microsoft Print
View 6 Replies