I had been searching as to how I could create an array of controls dynamically, and after some searching found some helpful code as shown below [code]This way in the above code "structureComboBoxes" will have an array of comboBoxes (VB6.0 was way easy to get this crap done!! I guess its cleaner here)Now my next problem is How do i code for events of each of these combo boxes?
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How to define handler events for dynamic controls.
View 3 RepliesI have a VB.Net WinForm Program. I dynamically create panels with controls.Each panel has:
2 Labels
1 DataGridView
1 Button
Everything works fine the first time I create the panels.
Everything gets created, and everything is functional.
If I have to re-create the form, I get rid of the existing panels (and their controls) with this code:
[Code]...
When I re-create the panels, I get the panels and all of their controls except Buttons.When I step through the debugger, I see the buttons being removed, and I see them being created, but they don't appear in the panel
I am writing an application that requires button controls to be created at run time because the amoutn of controls created depends on data retrieved from a database.
I believe I am creating the control properly but I am not capturing the click event.
Code example:
Dim myButton As Button
myButton = New Button
myButton.id = "id"
[Code]....
I need to create some serial port controlls manually. My program reads through a config file, and it if comes across an entry called COMPORT then I need to create a contol to talk to this port. The entries in the ini file might be
COMPORT=COM1
COMPORT=COM3
COMPORT=COM7
So here is my problem! I'd like to create the variable control name with part of the com port number, so I can always refer back to it.
EG.
Dim strVar as sring = "COM1"
Dim CName+strVar As New System.IO.Ports.SerialPort
i have created a dynamic tabpage and a dynamic tablelayoutpanel inside it then added dynamic textboxes and labels inside the tablelayoutpanel...the thing is , i am having a problem on how to access the value of those textboxes and labels and add them as new columns in the new table(tagpage) in mysql database, i can already create the table in the database but i cant add the new columns in it. heres the code for accessing the values of the labels and textboxes
error: NullReferenceException was unhandled....Object variable or With block variable not set.
sql = "alter table " & tbl_selected(counter) & " add " & frmMain.Controls("TLP_" & SecArrList_sp(counter2)).controls.item(SecArrList_sp(counter2) & "label" & counter).Text & " varchar(100) NULL;"
I know hoe to add a control at runtime to a form, what I would like to know is if there is a way to add code programmatically at runtime as well?
[Code]...
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]....
In our organization, we currently have 6 events that occur every year. These events occur on the following dates:
Dec 11 2011
Nov 04 2011
Nov 08 2011
Mar 15 2011
Jul 07 2011
Sep 02 2011
[Code]...
I have never dealt with dynamic control events before. I have a variable number of a controls each created at runtime. However I don't know how to code events for each control as they should do different things. I've looked at WithEvents and AddHandler and know I have to use Sender however not sure how to use /where to put eg. MouseEnter 1 panel when there's several.
View 5 RepliesI am adding a button on the form dynamically, and how to add click events for that but
View 2 RepliesI've created a User-form in excel and I need help in the coding part of it.Currently I have coded the User form, as shown below:
Option Explicit
Private Sub cmdAdd_Click()
Dim ws As Worksheet
Dim r As Integer[code].....
The section which says 'Find first free row from A21' up to'Cells(r, 4).Value = Me.txtQty2.Value' (highlighted in bold) is where I need help. I currently have 3 combo-boxes called 'cboProduct, cboProduct2 andcboproduct3' and next to each one of them I have a textbox called 'txtQty1,txtQty2 and txtQty3'. I am trying to get the first combo-box to find the first free row starting from A21 and go to cell B21 and the first textbox to go to D21. For the second combo-box to find a free row from A21 and go to B22 if B21 is used and the same applies to the textbox , if D21 is used to go D22.This also applies for the third combo-box and text box. However my coding doesn't work.
I have a tools strip menu item with dropdown items that are created dynamically.
For Each file In files
Dim newMenu As New ToolStripMenuItem(FileNameOnly(file))
tsmMachType.DropDownItems.Add(newMenu)
Next
So how would I go about setting up or creating events for these items? I need to have a check event and click event for each of the items.
I am adding items to a context menu strip from a list of items in a database when my form loads. This all works fine until I come across the issue of 'How do I react to the user clicking on one of these menu items?'
View 1 RepliesI have to create buttons at rum time based on database records and implement their events.
View 5 RepliesI'm converting a VB project to C#, and I notice that in vb it will call a function like:[code]on the asp.net source page or it will never hit the function. Is this a necessity in c#, or is there something that I'm overlooking or missing? Basically, is there a way in c# for it to hit that function like in VB without adding the line above in the source page?
View 2 RepliesI have combobox and I was wondering how do I call one of its events, for example,MyComboBox5_SelectedIndexChanged. I have no idea what to put in for its sender and e arguments.In other words; how do I complete the following statement
View 4 RepliesI have created a form in a project with some controls on it and put code behind those controls so they all work as I want them to. I now decide I want to group those controls within, say, a Groupbox to visually isolate them from the rest of the form.
So I select all the controls, delete them, create the new Groupbox, paste the deleted controls back and all looks OK. However, all the controls have now become "detached" from their associated events. The events still exist in code and the controls still retain all their properties but the controls no longer function.
Is there a way to "refresh" the project so that the controls are re-attached to their events or do I have to go through each control and do it manually?
I want to use the following snippit.
For Each x As Control In Me.Controls
If TypeOf x Is CustomControl Then
SomeAction( x.CustomEventofCustomControl)
End If
Next
The problem here is that not all controls have event CustomEventofCustomControl, so the complier shrieks. How do I get around this.
I have 10 labels named lbl1, lbl2, ... lbl10
I'd like to change their propriety (using a cicle) with the cicle index
for i as integer=1 to 10 step 1
lbl (i) = PROPRETY 'I know this is wrong but it's what I would do...
end for
I'm using a workaround, but I'm looking for a better way..
[Code]...
I am working on VB.NETPresent i am working on Dynamic Controls.As per below sending my Code ...... I was Created....First Step: i was Created CheckBox Controls Dynamically in the loop.Second Step: i was Created One more CheckBox Control name called 'AllProjects".
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
cn.ConnectionString = ("Provider=Microsoft.jet.OLEDB.4.0;Data
[code].....
How would you add Dynamic controls to your form, from an array which size may vary depending on how many controls the user has selected and has been retrieved from a database?
View 2 RepliesI am programmatically adding some custom user controls to a PlaceHolder which I have on a simple aspx page. All of the user controls Postback's work correctly except for one which has a Gridview on it.
For some reason any postback that gets fired from within this control, does not call the specified event on the first click, however all future clicks it will work fine. I have no idea why this is the case, but many solutions I have found, suggest adding an ID to the ascx User Control, however this doesn't work in my case.
I've taken a look at the source file for the page that gets generated before and after the first click, javascript used for calling the postback changes, i.e
Before first click: onclick="javascript:__doPostBack('tmpControlID$sgvPrimaryEmploymentHistory','Select$0')"
After first click:
[Code]....
Again, nothing overly complicated. The USERCONTROLNAME is just a const with the value "tmpControlID" in it.
The control that is giving me trouble is a little complicated, I was originally using a custom GridView control that we have created, but have removed it and replaced it with the standard asp one to see if the problem still occurs, and it does.
Any button, on control which fires off a postback will fail the first time, and all future click will work correctly. On the first click the Page_Load event will get called, but that is it.
Previous in my app, I've created dynamic controls and and named them blah0, blah1, blah2 etc. There will be a different amount created each time the user runs the app.I'm now trying to delete all of the controls but doing something very wrong. I've got the following
dim checkboxes = Controls.OfType(Of CheckBox).AsQueryable()
dim sPrefix as string = "blah"
for each checknum as checkbox in checkboxes
[code]....
When I execute the above, it only gets rid of every second control and I have no idea why. If I swap the dispose with a msgbox, the msgbox appears every time as I'd expect. It would seem that disposing of a checkbox seems to somehow requery the number available?
i have a form with many dynamic controls. i want to add an item to a listbox ( by the way, to find this listbox i'm using 'tag'. if someone have any other idea i'll be hope to hear but that's not the problem) in order to do so i use this
For Each ctl As Control In Me.Controls
If TypeOf ctl Is ListBox Then
ctl.items.add("i want to add this line")
[code]....
and items is not recognized and this eror massage apear: 'items' is not a member of 'System.Windows.Forms.Control'.
i have two controls consider two text box, as i enter a value in one text box the other should also be updated with the same. I used handlers but the problem with that is only when i leave the control the other gets updated i need it to be dynamically updated.
View 2 Replieshow i can program a dynamic controls(list view, datagrid, combo box, etc..)
View 2 RepliesI am creating a page with an area name and an input box next to it, code below:
Dim SQLConnection As New Data.SqlClient.SqlConnection(System.Configuration.ConfigurationManager.AppSettings("sqlstr"))
Dim cmd As New SqlCommand
Dim LoadAreaReader As SqlDataReader
cmd.CommandText = "ListAreas"
[code]....
This works great, the problem I am having now it retreiving the details once Button1 is clicked. I got as far as this:
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
For Each key As String In Request.Form.AllKeys
If key.Contains("txtPrompt-") Then
[code]....
But just need to display the id of the input box that has a value of more than 0. Am I close at all?
I'm having problems removing dynamic controls.
Here is what I'm using:
CODE:
The first sub is for adding the (custom)control, the second sub is for removing the control.
The custom control is a picturebox with a checkbox in the upper-left hand corner, no big deal.
The problem is that when I click the delete command, it only deletes one ckPicture at a time, and allways the last one in the list. I'm also assuming it's doing the same thing in the list(of images). What should I do differently so that it will remove all controls that are checked?
I forgot to add the variables in my namespace.
CODE:
I've volunteered for a simple webform survey for customers and I've stuck on creating dynamic controls/ lables for the questions.. The number of questions will vary so I'd hate to change this webform everytime.[code]....
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