Retrieving A Tag Of An Object Created At Runtime?
Dec 10, 2010
My
Public Class Form1
Dim x As Integer = 0
[Code]....
As you can see, i can retrieve the tag of the button (which is created at runtime) without any problems, i've made a temporary msgbox to show me the value of the tag, just for testing purposes. What i do have a problem with, is retrieving the tag of the individual web browsers, how should i do this?
Next issue, how would i code for my buttons to show the web browser with the same tag as the button that's just been clicked?
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Nov 1, 2010
I have written some code to generate 10*10 textboxes during run-time.the problem is; I don't know how to access / change them after they are created. after some googling, I found this code to show the text of ie box42;
MessageBox.Show(Me.Controls.Item("box42").Text)
but it gives an error (nullreference exception was unhandled) hereby the code;
For i = 1 To 10
For j = 1 To 10
Dim tb As New TextBox
tb.Name = String.Format("box{0}{0}", i.ToString, j.ToString)
[code]....
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Nov 3, 2009
how would I create an event procedure for something not yet on a form?
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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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Nov 11, 2010
I hope the question makes sense, anyways. I'm looking to know if in VB.NET, when we call an object's constructor, is there some kind of a reference that points back to the caller? I'm interested because of a corner case where I want the object being created to first be able to validate the existence of some data in the caller before it allows itself to be created. If this validation fails, I plan on throwing an exception. This corner case will never happen at runtime unless the object being created is used improperly by a programmer. The object being created is not inheriting the object I want it to validate, so I can't do anything with the MyBase qualifier.
It's bit of a "future-proofing" issue that I have a (bad) habit of doing. Not critical -- I can always leave stern comments behind as a last resort. Wanted to know if this was possible.
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Oct 28, 2011
i have created dynamic buttons at runtime and i would like to disable them when a user clicks on a form button.This is the code i have for that button:
Dim intXX As Integer = 0
Do Until intXX = intX
userAvatar(intXX).Enabled = False
intXX = intXX + 1
Loop
The buttonNames is an array of all populated button names created at runtime. However, trying the .enabled = false at the end of that does not work. What other ways are there to do that with buttons created at runtime?
[Code]...
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Dec 23, 2010
I'm trying to develop a program that turns matrices into their reduced Echlon forms. The user specifies the number of Columns & Rows for the matrix, which is generated by the following Sub Routine
Private Sub ButCreate_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles ButCreate.Click
'Columns and Rows are specified by the user
rows = TxtRows.Text
columns = TxtColumns.Text
'clears all of the controls(text boxes) from the TableLayoutContainer
[Code] .....
How to do is access/manipulate those newly created textBoxes. After the user enters values to those boxes, I want to assign each of their columns to an array.
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Jun 15, 2009
I am using the follwoing code to generate Menustrip at runtime.
Dim dgv1 As DataGridView
dgv1 = Me.MenuDataGridView
ReadMenuInGridView(dgv1)
Dim MItems As New SortedList(Of String, ToolStripMenuItem)
For Each dgr As DataGridViewRow In dgv1.Rows
[Code] .....
Where the sub "ReadMenuInGridView" passes the DGV by reference and populates it with the menu item from the database. My question is,, the program as it is in the form listed above works fine (where I have a DGV "MenuDataGridView" created at design time), however, if I want to make it 100% dynamic and use a DGV created at run time I will not get the menu? Actually the program will not get in to the For loop?
Simply to do that we can replace the first 2 statement with:
Dim dgv1 As New DataGridView
'dgv1 = Me.MenuDataGridView
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Oct 28, 2009
I'm developing an app which creates like 30 labels at runtime.The problem is that with the click of a button, I need to destroy those created labels.[code]...
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Jul 16, 2009
global variable can be created during runtime?
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Jun 3, 2011
i just made an form where with button add 10 textbox whith this code:
For X = 1 To 10
Me.Controls.Add(tx)
tx.Visible = True
[Code]....
now i want write somethings in textbox (i.e. textbox1.value="hello") but no find way, because in code is not defined textbox1, create at runtime (of course).
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Jan 18, 2010
I have a form on which I want to place labels created by code executed by clicking a button(cmdAddLabel) at run time. I subsequently want to move the newly created labels around on the form. The following code sucessfully creates the labels at run time whenever the cmdAddLabel button is clicked:
Private
Sub cmdAddLabel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdAddLabel.Click
Dim
[Code]....
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Jan 16, 2012
Been searching a trying examples for a couple of days and always fall back to the "null reference" error on this one. I have a set of instructions coming from a SQL database and the number of instructions is a variable. Therefore, I have a TabControl which I add TabPages to at RunTime depending on the number of instructions there are. The TabPages are then created with the names; Step1, Step2, Step3, etc.Each TabPage is made with the same controls and all of the controls are named the same from page to page (e.g. "instr" is the name of a TextBox control that exists on every TabPage).I can successfully create a GetControl method that will return the correct TabPage, but I cannot reference any controls on that TabPage.I can only change properties of the TabPage.If I try to reference a specific control on that TabPage, like the "instr" TextBox control, I get the null reference error.[code]
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Oct 18, 2011
I have successfully randomized certain pictureboxes in a grid to contain mines, and show that mine, and for testing purposes, those mines are currently showing. What do you think I need to do to be able to say[code]...
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Dec 13, 2010
So basically, i have successfully randomized certain pictureboxes in a grid to containmines, and show that mine, and for testing purposes, those mines are currently showing. What do you think I need to do to be able to say:
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Apr 21, 2011
i want to get the text that is input by the user to the textbox and use it in the parameter but why can i done this.. i declare a name for the textbox that i created during runtime but i cannot get what the text that input by the user.i use the (textbox name that will create during runtime).text but it gives me a blue line.
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May 6, 2009
I have been doing occassional VB.NET for a few years but never had the need to do something like this until today.My app creates a few comboboxes during runtime, and I need a way to assign the values of those textboxes at design time.
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May 17, 2012
Currently, I have a listbox lstInventory where I have loaded some database information from a .mdb file. I am able to add new records, and they all display correctly.
Yet, I can't seem to retrieve or access any of the listbox items. (Not trying to reaccess database in here, yet). I am hoping to "Edit" an existing database record by matching it to the lstInventory's selecteditem property. Unfortunately, I am not able to retrieve anything (tried traditional CType(lstInventory.selecteditem.ToString, String) approach, as well as a debug.write approach (which I can't seem to display, even with a Listener-which is another issue in itself).
Furthermore, when I check the listbox.items.count property, it prints out as a "0" [using a messagebox.show()]
I have tried searching multiple forums, but found lots of "database into listbox" threads, and the MSDN website hasn't helped me yet. Do I need to know the collection's name (what would it's name be based on ?)? Or am I not converting the object into a printable/countable quantity?
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Sep 8, 2011
I'm creating a VB.NET 2010 application which is connected to an Access 2010 database. I've set up a connection using the inbuilt connection wizard. I want to pull data from the tables using ADO.NET objects such as the data adapter to create datasets. The data adapter in ADO needs the connection object. Can I pull this from app.config? Should I junk the inbuilt connection and create a new one with code alone? Help.Scott M Brush
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Sep 19, 2011
My program creates columns at runtime with the following code:
Cmd = New OleDb.OleDbCommand("ALTER TABLE [Parent] ADD [" & ColumnDate & "] int", con)
objCmd = New OleDb.OleDbCommand("ALTER TABLE [Parent] ADD [" & ColumnDate & "] int", con)
objCmd.ExecuteNonQuery()
I add data into the newly inserted column with the following code:
da.SelectCommand = New OleDb.OleDbCommand(sql, con)
Dim cb As New OleDb.OleDbCommandBuilder(da)
cb.QuotePrefix = "["
cb.QuoteSuffix = "]"
ds.Tables("SchoolMaticsDatabase").Rows(inc).Item(ColumnDate) = Hours * Num
da.Update(ds, "SchoolMaticsDatabase")
All of the above works fine; the issue arises when I try to edit the information originally placed in the newly added column. These are the approaches that I have taken. (None of them give an error message; it simply won't update within the database.)
da.SelectCommand = New OleDb.OleDbCommand(sql, con)
Dim cb As New OleDb.OleDbCommandBuilder(da)
cb.QuotePrefix = "["
[code]....
I added a column to the table manually via opening the access database and all the above approaches work for editing data stored in that column. So I believe it is something to do with the fact that the columns are created at run time.
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Apr 18, 2012
I add textboxes dynamically at runtime. How do I access them later in the program?
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May 18, 2009
Site is located at [URL] and the section in question is the "configurator" button on my top row navigation. Everything is written in the latest flavor of VB.NET and ASP 3.5, and I have a SQL2005 server available with my host. Here is the down 'n dirty of my dilemma:
During pageload, I get a list of all the parts in my parts table. Then I create an image object and 2 label objects per entry and place them in my fancy accordion pane control. Works great so far, I can get a giant list of pictures and text that's aligned how I like it (for now). Now - I really need a way to be able to have a visitor drag an image/label/label combo from the accordion over to a panel (or anything really) on the right side that is currently invisible. Once the dragged thing is dropped into the drop target, I would like it to fire a function or sub that I write in VB.
From what I've seen about jquery, apparently there is a way to make an element on my webpage draggable, droppable, or what have you. The example code for it - I'm not entirely understanding so a quickie sample would be great. I'm a fast learner and can apply it from there to my project. More importantly, how do I get objects that are created during runtime to be draggable, and fire my event that I wrote in the only language that I know?
[Code]....
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Mar 19, 2010
I have found multiple examples of how to drag and drop images, but all of them use controls that are already on the form at runtime.
In my program, all of my pictureboxes are being drawn during runtime with the following
[code]...
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Apr 18, 2012
I have written a code to generate numerous command button during runtime depend on the user selection. I would like to find out how do we handle the command button click event?
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Jan 26, 2009
But why can't I figure out how to get one of any number of created WebBrowser controls to navigate to a website?I have a FORM a BUTTON and TWO TEXTBOX controls at design time. I run the program and it creates a random number of WEBBROWSER controls named WebBrowser1 to WebBrowser whatever.textbox1.text = a number, 1 - max number of created webbrowsers, determined in whatever way it is. but what if textbox1.text could equal 35, or 1, or whatever. HOW DO I REFERENCE IT'S ASSOCIATED WEBBROWSER CONTROL?!?!?I've spent a few hours researching this and I find page after page on creating controls, but I can't change the data of a control determined at run time, and I can't find how to anywhere.
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Dec 8, 2009
I'm creating an array of textboxes using this code, (x number of textboxes)
'Quantity textboxes
ReDim QuantityTextBoxes(x)
QuantityTextBoxes(x - 1) = New TextBox()
[Code]....
I need to sum the values of each textbox, but only if there is a value in it. I have error checking elsewhere so that isn't the issue. It keeps giving me an error saying "Object reference not set to an instance of an object."
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Apr 13, 2009
I am trying to figure out out ttrigger a click event from a Picturebox object that is created during runtime? application that I am developing using Visual Studio 2008 during runtime a user selects a shape from a Panel3 on the right side of the form and then clicks on a location inside Panel1 where that shape is copied over. Almost like a Visio application but without the drag and drop.The name of my new shape via a is call "C_Object" I would like the user to be able to select this new shape and a click event to be raised but because this PictureBox object was created during runtime I am not seeing the event.
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Jul 23, 2009
I have created a program that allows the user to click on screen and add many ovalshape objects. But I have got stuck as now I need to create a rightclick event for any of the runtime generated ovalshapes on screen and dont know how to refer the right click event to all the many objects?
My code for creating the oval's are as follows:-
Dim
Drg As New ShapeContainer
Dim Shape As New OvalShape
Drg.Parent =
Me
Shape.Parent = Drg
Shape.Size =
New System.Drawing.Size(10, 10)
Shape.FillColor = StampColor
Shape.FillStyle = FillStyle.Solid
But how do I write a click event now for any of these runtime created objects???
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Apr 24, 2009
I want to make my save button save the contents of the text box on the selected tabpage to the open text file. I cannot think of how to do this, as the tabpages are created at runtime, and so do not have a global name. The write function is here (the ??????? is what I am unsure):
Private Sub SaveToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SaveToolStripMenuItem.Click
Dim fileWriter As StreamWriter
[Code].....
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May 13, 2011
I am kinda new to VB, but have used C# to pull data from a SQL Server db using DataTables and Reader, etc, however I am at a loss as to how to accomplish this in VB.I have a variable, which the user specifies, that I wish to use as a parameter in a SQL string, much like the following: "SELECT x FROM y WHERE x = '@param'" The result will then be stored in a string variable and I wiill do what I have to do with it.
[code]...
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