.net - Why After GroupBox Control Deleted From Form, The TextBox Is Not Created On The Form?
Jun 8, 2012
I need to create text box at a run time.
I found the following VB NET code:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim textbox1 As New TextBox
[Code].....
When this row GroupBox1.Controls.Add(textbox1) and GroupBox control are being deleted from Form, the TextBox isn't created on the Form after the event is fired.
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May 9, 2012
I have multiple form application in vb.netNow i rose to a condition where i want to display one Form in the Groupbox/Panel control of other form.
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Dec 30, 2010
I created a user control with a label and 2 combo boxes, and a public property called ControlDataSource that accepts a dataset - which it populates the combo boxes with. I added the reference to the VB project I want to use it on and to the toolbox. I was able to draw it on the form with no problem and use it. However, after changing the backcolor on the control and recompiling it, it is no longer seen by the form. When I bring up the form it's used on, I get a white screen with a bunch of xml. The problem seems to be in the designer, and I get an "object reference not set to an instance of an object" error. Here is the code from the designer:
[code]...
The reference error is pointing to the line: Me.UcDx1.ControlDataSource = Nothing
Here's the wierd part. If I hover the cursor over that property, it correctly identifies it as a dataset. So it does know what it is, but it can't seem to use it.
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Jul 16, 2009
I have an application that dynamically creates winforms.
Dim NewS As New Form
Dim NewT as new Timer
NewT.Interval = 5000
[Code].....
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Nov 11, 2009
i deleted my previous start up form to be replaced by another one but each time i launch the application,the deleted start up form is still displayed.i dont know from where this deleted start up form is being loaded.
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Sep 23, 2011
While testing my "nearly" completed application I deleted one of the primary forms.The code is intact, and the designer code is there byt the form is gone.
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Feb 10, 2010
i want to set the CommandTarget property of menu item to the TextControl which is written in win form or just tell me any way which can execute the command lets say cut copy paste on the control which is written in win form user control and added to xaml through WindowsFormsHost
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Mar 22, 2011
I dont have any back up for that form. Is there any other way to recover that form in vb 2008?
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Feb 18, 2012
I have a lot of control array textboxes called txt(1) to txt(320) on form2. I have a textbox1 on form1 with a click evet that says textbox1.text= form2.txt(1).text but it gives an error (txt is not a member of form2). I tried disabling option explicit, option strick and option infer. Still won't work. My code is to long for this place maybe a short version osf the code. Do I need to make a Public MyArray(15,15,15,15) as string, in the Module1 then copy txt(n).text to the array or is there a way to access txt(n).
Public Class Form2
DPrivate Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Loadim txtBox(340) As TextBox
[code]....
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Jun 18, 2011
I have 2 forms main_frm and copying_frm. In main_frm, there is a list view that is populated with file names. The user then clicks save and all the files in the list are copied to a folder that they choose using a folder browser dialog. When this happens, I do copying_frm.ShowDialog() to display the copying_frm. The copying_frm contains a progress bar and a cancel button. I can get the progress bar to indicate how much has been copied. But that freezes up the application. To get around this, I create a new thread (called copyingThread) that copies the files. When that thread runs though, it can't access the waitingList_lvw in main_frm. For example, in the function that the copyingThread executes, if I have this line of code: MsgBox(main_frm.waitingList_lvw.Items.Count.ToString()) the result is 0. Also, I don't get any errors and no files are copied. How do I access waitingList_lvw in main_frm from a thread called copyThread that was created in copying_frm?
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Jul 30, 2011
I have an app where a user enters information on a ticket and that ticket is saved off to a file on a share.Later on, when the ticket is closed or resolved, the file is deleted.Pretty straightforward.The below code is used to achieve this but, and this is the odd part, I'm finding that sometimes the app does not write the file and other times it will not delete it.I've confirmed that the user is running the latest version, that the tool isn't in off line mode, that all the appropriate criteria are set to true before entering the routines. It works 99% of the time but every so often it doesn't create/delete the file and there are no errors thrown or anything.Going into this section of code, chkOffline is not checked, "GoNoGo" is set to "Go", "Type" is set to "Live" and all fields have been filled out on the form(and vetted).What's more, there are other actions earlier in the app/sub that rely on these same conditions and those actions are getting carried out.[code]
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Aug 26, 2011
Im Using VB 2008. I have MsgBox() statements in all Mouse & Form Click events to TEST & NOTHING FIRES during Form Load when I click on Form or Button Controls !!! The Form Load event contains code for Displaying the Label.Text control many times with changes in the Text to simmulate annimation.
[Code]...
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Sep 1, 2008
i have a form with 6 tabs on 3 of which have controls, spent a lot of time putting it all together, set it up to link to a SQL DB, all working fine,Until....at the bottom of the form (in design mode) you have the icons that say BindingSource1 and CustomerDataSet1 etc.Well i accidently deleted some, now when i run the form i got an error saying that it couldnt load, i see the code is there but the form is just the blank form you get when you start(the form is still the same name and if i click view code all the code is there, but on the form are no controls, no tabs ... its all gone....(i only deleted a binding source ) i dont understand where its all gone.
when you click on the undo it didnt put the deleted items back (and i am not sure which one there were) now that the form has gone back to normal there are no Binding sources at the bottom I opened the designer code, i see the names of all the missing items, e.g. CustomersDataSet1 and TblCustomers1BindingSource1 e.t.c do i just re add those back to the bottom of the form and then the main controls will re appear?
I have looked through the code and re added the binding sources and adapters that are referenced in the code along with the Binding navigator, if i run it the form is still blank.I have tried to add the controls back and when i do it adds it as e.gTblCustomers1BindingSource2 if i try to rename them to the name they should be ie. TblCustomers1BindingSource1 it says it already existsI am using VB 2008 Pro?
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Mar 15, 2012
I have a listbox and would like to save the items added/deleted when the form closes.
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Apr 5, 2011
so I am a little confused. I am trying to refresh my datagrid when I have either add, deleted or edit a row via another form. I have it so my main form shows the datagridview, I have bound my controls to the database and I see all rows, no problem. I also have it setup to double click a row and it brings it up in another form to edit that record. This works. but it doesn't refresh the datagrid when saved. I am trying to follow this thread, specifically this post Refresh Datagridview - Post 2 Here is how I am loading the datagridview in main form
[Code]...
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Feb 9, 2012
I make a user control with textbox. When user press enter and textbox doesn't have any text then a search form open. Search a data and select some think and return to main form where my textbox control insert. I write a code below :
If txtIsbn.Text = "" And e.KeyCode = Keys.Enter Then
Frm_Book_Search.FormLoad = True
Frm_Book_Search.ShowDialog(Me)
[CODE]...
But problem is that when Frm_Book_Search close and it must be focus in textbox but it not happend. when user close the frm_Book_Search form then not focus my application another software if open at that time it will be focus that software. if there is not open any software then it is not any problem it will be focus my application in my textbox. how can i write code to focus current form after close frm_Book_Search form.
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Dec 14, 2011
I'm making a login form in VB.NET, and I have a table in mysql called user. What I want to do is before a user can login the Administrator column of the user table must be TRUE and the DELETED column must be FALSE. I've tried everything I know but all non admin users are still able to login... Heres how the user table looks like:
[Code]...
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Sep 9, 2010
I want to write one text character to a textbox control on a Windows Form application. I have tried this and it doesn't work.TextBox13.Text = "5"
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May 7, 2009
I am trying to code my pet age calculator form to allow user interface for the user to choose feline or canine, choosing the ok button will then invoke the frmCanine or frmFeline, can anyone work with me on this?
Public Class frmPetCalculator
Private Sub rdoCanine_checkedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles rdoCanine.CheckedChanged
[Code].....
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Jan 12, 2011
I have several textboxes in a winform, some of them are inside a groupbox. I tried to loop over all textboxes in my form:
For Each c As Control In Me.Controls
If c.GetType Is GetType(TextBox) Then
' Do something
[code].....
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Sep 15, 2011
I have a strange behavior with a dynamically created TextBox-Control. The control is created in the handler of the Load-event of a dialog-form like this:
[Code]...
Now the situation is, that in most cases it works fine. But a few of my customers report that the TextBox not appears on their dialog - it's not there! That's all, nothing more to say.hints or reports about known pitfalls with dynamically created controls which could explain this (sometimes) strange behavior and how I could fix it (I have to create this control dynamically due to some reasons).
BTW: The program is built with Visual Basic 2005. And the customers with trouble are spread about the OS's (XP, Vista, 7).
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Nov 20, 2009
I need update the text of a textbox when I do click on a button on a user control.
How I can do that?
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Nov 19, 2009
I need update the text of a textbox when I do click on a button on a user control.
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Feb 8, 2012
creating single instance form in MDI Application. How to check whether form's instance created or not?
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May 19, 2012
I have various input textboxes on my form. And based on entries made in each of the input textboxes, I update the display textbox. However, using AppendText message of textbox. I have my input textboxes set to accept only numeric values. So for each character inputted correctly, I update the display Textbox. Problem I have is when user selects Key.Back or Key.Delete, what I would like to do is do a Delete of last character in the display textbox, but I am yet to get this right. How do I delete the last character in the string that is contained in a TextBox using AppendText()
[Code]...
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Dec 18, 2009
Option Strict Off Option Explicit On
Imports Microsoft.VisualBasic
Imports System
Imports System.Data
Imports System.Data.OleDb
Imports System.Data.DataSet
[Code]...
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Aug 18, 2009
i want to select the row on datagridview and send it cell's value into textbox / label control on the same form..but it seems not work, but when i use
Private Sub DGV_CellClick(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DGV.CellClick
it can but i have to choose by click on each cell on it datagridview..what i want is i only have to click on it[datagridview] row but i get all value on it's column.. so i can parse/send it value into textbox.it only can be clicked with single row i knew it by DataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect
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May 21, 2009
I trying to fade-in the application startup form using the forms opacity and a timer control.I dont know if I am using the right approch to achieve this so suggestions for alternatativ approches are welcome.I have a form with a few randomly select controls on it, one of which is a textbox.When I run the code, the form and all its controls reflect the changes to the form opacity property set through the timer_tick event except the textbox.The textbox remains clear all the time and I would like to know: Why?[code].....
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Apr 28, 2011
I've inherited a large Visual Basic project that has a number of "frames" (obviously, it came from Visual Basic 6.0) which are now GroupBoxes. They all cover the entire form. The program chooses which one to display during execution. That all works fine.
Is there a way to switch between them for display in Visual Studio designer? Now it's displaying only the last one added, and I have to go to the code rather than Toolbox to make changes to all the ones behind the top one.
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Oct 5, 2009
If you want a instance of an object to be created when a form loads or another class is created, you have two options:
Public class example
private IAmAObject As IAmAObject
public sub new()
[CODE]...
Or like this:
public class example
private IAmAObject as new IAmAObject
public sub new()
[CODE]...
I always use the first one. It's more type work but I think it's neater. How about you people and is there any real difference between the two?
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