Reference Control By Its Name?
Nov 19, 2009
Not sure why this is being so difficult..I want to reference a property of a control through code by its name. I should be able to use "Me.Controls("ControlName")", but this gives me an ArgumentNullReference exception, no matter how I try to do it.Here is what I'm doing:
I have several buttons on the form with standardized names (minExpandOSD, minExpandSettings, etc). All the buttons names start with "minExpand" and the last portion of the button name is always the same as its parent (a group box). Each of the group boxes also have a standard name (GroupOSD, GroupSettings, etc).Each groupbox has a minimize/maximize button. I have many group boxes. Rather than copy the same code block for each groupbox, I am trying to write a sub that can be called for each of the group boxes.
[Code]...
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Apr 20, 2012
I have a UserControl named DataGridViewFilterAndSorter that I built using a SplitContainer. In each Panel of the SplitContainer contains a FlowLayoutPanel and in each FlowLayoutPanel contains a LinkLabel.
I have a procedure that accepts a reference to one of the FlowLayoutPanels in the UserControl. I want to get a reference to the UserControl (DataGridViewFilterAndSorter) using the FlowLayoutPanel reference. Currently, I have to use this[code]...
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Nov 16, 2010
I have created a user control and am able to add it to a page with out any problems, but how to I reference a control that is inside of the user control For example if I have a text box inside the user control and want to set the text property through code or get the text property, How can I reference the control inside the user control. I have tried a few different things but nothing seems to work when I type the usercontrolname.control.property I just get an error.
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May 5, 2010
I wont to add swf file to my Vb.net project. I'm using Visual Studio 2010. How can i insert swf file to vb.net project ?
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Sep 7, 2008
I'm new to VB (and .net), just started taking an introductory class. One of the things we've done is set up a little form that does basic math. It looks something like this:
Code:
[txt1] = [txt1mod1] + [txt1mod2] [btn1]
[txt2] = [txt2mod1] - [txt2mod2] [btn2]
[txt3] = [txt3mod1] * [txt3mod2] [btn3]
[txt4] = [txt4mod1] / [txt4mod2] [btn4]
When you click btn1, it adds the values txt1mod1 and txt1mod2 and displays the answer in txt1. The same happens for buttons 2, 3, 4 on their respective lines. So the way we handle this is to have four subprocedures that handle the button clicks, one for each button. I was thinking it would make more sense to have one function handle all of the button clicks, since it's basically the same thing. Through my own research I've learned you can have multiple events call one procedure like so:
Private Sub btn1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn1.Click, btn2.Click, btn3.Click, btn4.Click
'stuff
End Sub
But how do I determine which of the four buttons was clicked, and which text box values the user cares about? Then after doing so, how do I reference the relevant controls (txt[x]mod1, txt[x]mod2, txt[x])?
Code:
Dim b As Button = CType(sender, Button)
Dim t As String = b.Tag.ToString
But it gets a little fuzzy after that because I can't figure out how to reference the controls using the tags. I don't even know if I'm going down the right path. I can, for example, set some string to
Code:
strBox1 = String.Concat("txt",t,"mod1") 'string is "txt1mod1" for example
but trying to reference the control
Code:
...strBox1.Text...
gives me errors that, "Text is not a member of String."
Well, I don't know if this is correct or not, but it seems to work if I use "Controls()":
Code:
'if t = 1
Dim a As String = Controls(String.Concat("txt",t,"mod1")).Text 'value of txt1mod1
Dim b As String = Controls(String.Concat("txt",t,"mod1")).Text 'value of txt1mod2
Dim s As Integer = CInt(a) + CInt(b) 'im actually determing the operand elsewhere
Controls(String.Concat("txt",t)).Text = s.ToString
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Jun 6, 2012
When I am working in a project I can reference the current form using "ME"...
Is there a way to reference the current control?
For example I am working in the button1_click subroutine. I can type button1.text but is there a MYCURRENTCONTROL.text that I can use?
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Nov 21, 2009
Do i need to add a reference to a third party control(DLL) before i can use it.When i go to project->add refernece ,i select the control but it didn't becomeavailable in toolbox to use it.Do i need to install that control?I just placed it inwindows/system32 dir.
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Jan 11, 2011
If i have a check box in a groupbox on my form, and i wanted to get the "control" using its name, how would i do that?
The function below returns the control, but only if the control is on the form directly. It doesn't function if the control (in my case, the checkbox) is in a groupbox, or on a tab control, or both!
Private Function getControlFromName(ByVal controlName As String) As System.Windows.Forms.Control
Return Me.Controls(controlName)
End Function
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Feb 4, 2012
I have some different controls (PictureBox, Label,Button...) that are created by code. The set number of these controls isnot fixed. So let me set this number ton. And I have the following lines of code to create some of these controls.
For i5 As Integer = 0 To n
dBoxArray(i5) = New PictureBox 'PictureBox
Panel1.Controls.Add(dBoxArray(i5))
[code].....
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Jan 30, 2010
I have a MS Access database set up, with a Period field that has either values 1, 2, 3, 4 or 5. I retrieve these values using a database connection and I would like to reference a particular control based on what period was grabbed from the database.
Here's example code, pseudo of course.
TextBox(dr(3)).Text = dr(0)
dr(3) contains the period, and dr(0) contains the content I would like to put into the text box. I have these text boxes on my form: TextBox1, TextBox2, TextBox3, TextBox4 and TextBox5.So if dr(3) contained 2 then I would want to reference TextBox2.
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May 7, 2012
I have many textboxes that I need to reference dymanically. The controls themselves aren't dynamic, just the way I need to reference them.I've got several text boxes say:
txtMe1
txtMe2
txtMe3
...
txtMe100
I will need to randomly change one of the properties of the edit boxes. So lets say it picks a random number between 1-100 which is 56. So, I would want to change the background of my 56th edit box to:
txtMe56.Backcolour = Color.Gray
The only way I could think of doing this would be to have one giant select case statement to evaluate the random number. But, that is really dirty and not the best peformance wise (this could potentially get called hundreds of times) so was wondering what my options are?I tried to concatenate the random number to my generic control name 'txtMe' but it throws a wobbler. I essentially would want the following to worK:
dim iNum as integer = 56
txtMe & iNum & .Backcolour = Color.Gray
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Mar 20, 2011
I'm writing a program that inserts controls onto a webform dynamically. Depending on a variable, I add either a textbox, a set of radio buttons, or a set of checkboxes. Later, after a user clicks a submit button I need to use the controls to determine if the user is submitting the correct answer, but when I try to reference the id of a control, I get "txtAnser is not declared. It may be inaccessible due to it's protections level. Here is the .aspx page (it's the standard content page of a master page):
[code]...
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Sep 11, 2009
In THIS Thread:NickThissen Said:Quote:It will appear in the toolbox even if you put it in the current project, instead of a control library project.No, it does not have to be in a control library, nor does it have to be a UserControl, to appear in the Toolbox. Any class inheriting (either directly or indirectly) from Control or Component will appear in the Toolbox. Since RadioButton inherits from Control, and your control inherits from RadioButton, your control inherits from Control too, so it will appear in the Toolbox. I have successfully created a pretty cool custom control. I Built the project and have added the a reference to the .dll form a new Windows forms project. It works great, as long as I do something like THIS:
Dim ThisControl As New MyCustomControl
ThisControl.Top = 40
ThisCOntrol.Left = 40
[code]....
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Feb 21, 2012
I have a few text boxes on my form (txt1, txt2, txt3...) and would like to assign values to them based on the index. I not sure how to describe but Something similiar to the following:
dim i as integer = 30
For n As Integer = 1 To i
[txt] & i.text = MyText" & i
Next
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Feb 20, 2009
I have two FlowLayoutPanels in a Form. The first read images from a DIR and expose them generating so many PictureBoxes are necessary. The user can drag an image and drop into the second Panel. All works fine. Now the problem is how can I know the name of the image contained in the PictureBox in the dropped Panel so that I can save it? I tried to recover in a ListBox the name of the images during the population of the first Panel but I don�t know witch may be the reference with the dropped PictureBox.
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Jan 22, 2010
I am attempting to move Visual Studio 2008 project from an XP Pro development environment to a Win 7 64-bit Ultimate environment. In the process of doing so, I have one ActiveX COM control that the project uses. I've installed that control using the maker's installer. Now, when I open the project, the project cannot find the control, etc. - "The system cannot find the reference specified." I also tried moving a particular file to the system32 directory, as per a possible fix they posted, but that didn't help either.
[Code]...
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Feb 20, 2009
I am writing this codes on classlibrary to make the changes of the text and I want to control the form as well. I have wrote the last if statement on the bottom of the code that if the form is on the right side, then set the form from righttoleft. I get an object reference which is not set to an instance of an object. Here is the list of the codes that I am writing to make changes of the text on each menu items and control the form. [Code]
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Mar 14, 2009
In vb.net 2005 how would one referance a control as variable and change it"s properties. Such as in control X visible = True. Tryed string manipulations that did't work.
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Mar 31, 2011
I have a GUI that allows a user to add tabpages to a tab control. Everytime the user adds a tab, a user control is placed on the new tab. The user control has a background worker on it, as well as several other controls. My question is this: Can I access the backgroundworker specific to a tabpage? In other words, can I tell the program to use the backgroundworker found on tab index 0 to run a process, and then tell the backgroundworker on tab index 1 to run a different process?
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Oct 7, 2008
Using MDI in .net, how do you reference a control on a parent form from a child? Like, if on the parent I have a textbox called txtBox1, what could I do from the child form to read the contents? I've been googling unsuccessfully all day. The closest I've found is
Parent!ControlName.Property
I don't know what the ! is supposed to mean, but I get an error here: Class 'System.Windows.Forms.Control' cannot be indexed because it has no default property.
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Nov 24, 2009
I have a program that allows the user to add steps to a process (tabpages in a control). All tabpages are generated on the fly by duplicating a "template" tabpage and consequently have the same control names such as textboxStepDesc. Here is the hierarchy of the controls to get to textboxStepDesc.[code]...
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Jan 31, 2012
How do I reference txtCourse1.text and txtDept1.text using an index variable similar to to code below which does not work?
'two controls on the form
txtCourse1.text
txtDept1.Text
[code].....
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Jun 28, 2009
i had to get the reference of an object/Control(for e.x a textbox) which is open in another .net application. I was able to retrieve the handle of that .net applcation form. but i was not able to obtain the reference of that form. I tried to using control.FromHandle(handle) function. but it returns a null for the handle i passed since the handle is not associated to the application I am running.I also tried to add the handle to my application with the following code.
Dim nw As New NativeWindow nw.AssignHandle(&H100300A) '&H100300A is a valid windows handle for an application which is open Dim c As Control = Control.FromHandle(nw.Handle)but c returned nothing.Is there any way using which i can get the reference of an object in another .net appliction from my application.
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Jul 15, 2009
I have one control named thumbviewer inside repeater. I want to set its imageurl in
code. Currently it's done in aspx itself as
<asp:Repeater ID="Repeater1" runat="server" >
<ItemTemplate>
<span style="padding:2px 10px 2px 10px">
<bri:ThumbViewer Id="Th1" runat="server" ImageUrl='<%# Eval("Name", "images/{0}") %>' Height="100px" Width="100px"/>
</span></ItemTemplate>
</asp:Repeater>
How can I set ImageUrl in code?
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Jun 27, 2011
I have a user control that I'm adding to a webpage dynamically. The ascx has a couple of controls that I want to have access to at runtime. I can access the ascx itself, but none of the controls on the ascx are available. I have tried adding a simple public variable and also tried adding a public property to the ascx, but I am unable to get access to either of them at design time (compile errors). I added the following to the code-behind of the ascx control:
Public Property areaCode() As String
Get
Return iebEmpPhoneAreacode.Text
End Get
[code]....
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Mar 30, 2010
I have a datagridview control on a form that I want to make readonly, before showing the form. I can disable it before showing the form with the [code]...
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Apr 10, 2012
I'm trying to add a custom panel to my toolbox using a dll file, but when I add it as a reference it only appears as greyed out - and this is only after I click "Show All" in the toolbox.Everything builds fine in the Class Library project I used to create the custom control. Here is the simple
Imports System.Windows.Forms
Public Class pnDoubleBuffered
Inherits Windows.Forms.Panel
Public Sub New()
[code]....
I build the project, open my main project where I want to use the control. Then I click "Choose All" from the toolbox and add the reference using ".NET Frameworks Components". I find my dll file and click OK. Then nothing is added to the toolbox. I manage to see the control greyed out when I click the "Show All" option.
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Jul 13, 2010
I have an app with 24 different Forms. They have some security options based on which the 5 different buttons Submit, Approve, 2nd Approve, 3rd Approve, Reject etc get enabled disabled.Now I designed a MainForm that has all the buttons and the security code for them. I have created eachform as a usercontrol and load them dynamically based on which form the user wants. My loading works perfectly fine. I load the control and Add it to the place holder in the Page load event of the main page.
Now when the user selects the Submit button I want to call the Save method inside the usercontrol of the Form as each form will have a separate Save. So when I try this code snippet I get the Null reference error. Do let me know how to resolve it.
Private UCDynamic As UserControl
Then on Page Load event I use this code
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If not Me.IsPostBack
UCDynamic = LoadControl("Controls/BkCode.ascx")
Me.PlaceHolderForm.Controls.Add(UCDynamic)
End if
Then on the ButtonClick Event for Submit I do this
Protected Sub Save_OnClick(ByVal sender As Object, ByVal e As EventArgs)
Save()
End Sub
[code]....
Thats where I get the cast Null reference error. So is it that after post back the control no longer exist on the page.
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Feb 5, 2012
I have a really simple user control.Using the Designer I put two TextBoxes on it, nothing else.Here's the entire .vb file for this user control:[code]
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Jan 7, 2010
In a ASP.NET app from a procedure IN a VB code file a dynamic control is called. The first problem may solve the second. In the following line of code I am getting an "end of statement expected" error at the following line.
[Code]....
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