Forms :: DataBinding To Controls?
May 17, 2010I 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.
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Databinding Between Controls?
Mar 26, 2009I'm trying to do something with databinding between 2 controls...Here is a sample code (that doesnt work - and that is my wonder):
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'Me.TextboxPlus2.DataBindings.Add("Text", Me.TextboxPlus1, "Text")
[code]...
DataBinding - Controls Do Not Update Data
Aug 23, 2010I have a datagridview and some textboxes and other controls all bound to a bindingsource. When I first run the project the controls all show the correct data (the first row in the datasource) but when I change rows in the datagrid my controls do not update their data.
My code:
Private Sub BindData()
Try
bs = New BindingSource
bs.DataSource = dtPromoList
dgvPromo.DataSource = bs
[Code] .....
Databinding Windows Form Controls To XML File?
May 19, 2010I have a form that with a list of text boxes. My target is simply binding these controls to an XML file so that whenever the file contents are changed externally, the text box values change dynamically. I will have an external application edit the XML file and overwrite the existing one.
View 4 RepliesForms :: Activation Of A Databinding
Sep 27, 2011Let's say we have a controltab with two tab. The first tab contains textboxs where entry values are entered On the second tab are textboxs that display the results. I have noticed that if I fill up the entry values and create the binding between each textbox and their property and then I destroy it (without clearing the textboxs), the textboxs of the second tab will not display any result. I have this exemple here BindingAddition.rar
[Code]...
One Dataset For Several Forms - Databinding
Oct 9, 2009My project currently holds one dataset and several forms. In each form I have dropped an instance of that dataset and certain editors are bound to tables of that dataset instance. Now this means that when each form is loaded I also have to load the relevant data into the dataset instance of that form (basically i am loading the same data more than once).
[Code]...
Forms :: DataBinding Only Works Under Certain Circumstances?
May 23, 2011I have a Windows Forms which contains a whole bunch of different text items on TextBoxes, Labels, and ComboBoxes. I then catalog what is written in these Textboxes and selected in these ComboBoxes in XML files so that they can be reopened later. Because what goes into the Textboxes and ComboBoxes are physical quantities, they have units (for examples "Inches," or "Lbs," etc.) which are the text of the Labels themselves. Multiple quantities share similar units, so I don't allow the user to change each one individually, but instead change a unit globally (for example, all weights in "Kilogram" instead of "Lb").
The units themselves are Public Properties of a separate class which I named "MyDBClass". The properties raise events when they are Set, so that objects data-bound to them change as well.When I initialize the main Windows form, I instantiate a class of type "MyDBClass," set all the unit defaults ("LengthShort = mm," etc.), and create a databinding for the Labels to the "MyDBClass" properties (e.g. ctrl.DataBindings.Add("Text", MyDBClass, "LengthS") ). From then on, the only way the user can change the units is to use my MenuStrip and select "New" (which erases all text and sets the MyDBClass properties back to default), use the MenuStrip and select "Open" (which opens an XML file, reads the "Unit" elements in, and uses them to set the MYDBClass properties), or use the MenuStrip and select "Change Units" (which brings up a dialog with a handful of ComboBoxes containing possible units, and then sets the properties of the MyDBClass based on what the user selected in the dialog).
Having said ALL of that, I can finally get to the problem- one of my units ("SpringRate") does not change when the user selects "New" or "Change Units" from the MenuStrip. It will only change when the user opens an XML file. This makes no sense, as the act of opening an XML file calls the exact same code as selecting "New" from the MenuStrip (which is that is sets the properties of the MyDBClass). The label is also identical to its surrounding labels and the ComboBox which selects the unit is identical to its surrounding ComboBoxes (I tend to use Copy/Paste when working in Design mode). I even put Try->Catch blocks around the Property's Set code and the code inside the other Subs which calls it.
Forms :: Databinding Visibility Property Of A Textbox?
Dec 5, 2009I seem to be having a problem binding the visibility property of a textbox to a database value using the advanced binding property.
I found this article (BUG: Inconsistent behavior when you bind the Visible property of a Windows Form control to a Boolean field) stating there is a bug in some older versions of the .net framework.
Does anyone know if this has been fixed in 4.0?
Forms :: Populate Textboxes Based On Combobox Selection NOT Using Databinding?
Apr 27, 2010how to go about this? I have a form, frm1 w/a combobox, cboLocations, which is being populated using a sql string. There is also a frm2 w/a series of textboxes and other comboboxes. I want it so that once a selection is made from cboLocations, the textboxes and comboboxes on frm 2 are populated with the corresponding data. Here is what I have so far:
frm1:
Public Class frmLocations
Dim conn As New SqlConnection("Data Source=f03d3s-dev01; Initial Catalog=dos_track;User Id=vbuser; Password=tran3;")
Dim depot_refnbr As Integer
[Code]...
What's happening right now is that I make a selection from cboLocations on frm1 and click on the OK button, frm2 loads, but none of the textboxes are populating and one of the comboboxes, cboDepot, shows the different data when you click on the down arrow, but it's not displaying anything it its text field when frm2 loads.
Forms :: Dynamic Controls Disposal - Only 50% Of Controls Removed?
Sep 17, 2010I 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]....
Manage Controls If There Are Many Many Controls Placed On The Forms?
Dec 10, 2006I 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?
Forms :: Adding Controls To Mdi Forms?
Jul 7, 2011I 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 RepliesForms :: Creating Paragraph Styles Of Text In Window Forms Text Controls?
May 8, 2010I 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.
Forms :: Increase A Forms Opacity Without Increasing The Opacity Of The Controls In The Form?
May 30, 2009How to increase a forms opacity without increasing the opacity of the controls in the form?
View 1 RepliesIDE :: Cannot Add Controls To New Forms
Jan 9, 2012For 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 Replies8 Bit GIF - Transparency / Forms And Controls
Apr 3, 2012I 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 RepliesAccess Another Forms Controls In .NET?
Mar 19, 2010I'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
Accessing Controls Between Forms?
Sep 4, 2010I 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]....
Binding Controls In Win Forms?
Jul 2, 2009If 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.
Forms - Resizing Controls Accordingly
Feb 12, 2011we 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.?
Forms :: Grouping Controls Using Tag Or Name?
Feb 24, 2010I 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 RepliesForms :: How To Resize Controls
Sep 1, 2009im 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 RepliesForms :: Set Controls Properties All At Once?
Jul 4, 2009is 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 RepliesInfluencing Controls Between Forms?
Mar 31, 2009I 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.
Use The Tag Property Of Controls & Forms?
Dec 14, 2009Does anybody use the Tag property of controls & forms? If so, what for?
View 6 RepliesControls On Inherited Forms Moving Around?
Oct 28, 2009I 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 RepliesForms - .net Controls In Separate Files?
Aug 8, 2011VB.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?
Forms :: Controls Added At Runtime
Jan 1, 2011I'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 RepliesForms :: Controls Cannot Be Added To The Form?
May 9, 20101. 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?
Forms :: Find The Existing Controls?
Jul 31, 2009I 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 Replies