VS 2008 Indicate An Object Is Created?
Apr 12, 2011I have a dll that create container object. How can dll inform a form that the container (me) has been created. Is it possible in new sub of that class?
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Declaring A Object - Instance Of An Object To Be Created When A Form Loads Or Another Class Is Created
Oct 5, 2009If 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?
VS 2008 Change The Property Of A Created Object
Apr 24, 2009how do i change the property of a created object in the timer event? In other words i have a button that creates a panel for me, in a time event i want to change the created panels to a different backcolor, how would i do this?
View 1 RepliesWhen Calling New On An Object - Can The Object Being Created Refer Back To Its Caller
Nov 11, 2010I 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.
Created An Access Object?
Oct 11, 2010I created an Access Object in vb.net:Dim acApp As Object = CreateObject("Access.Application.11")en I open Access I need to pass a parameter to it though "/cmd".I read that the only way to accomplish this is through a shell - that it is not possible directly using an Access object.
View 5 RepliesCreated Object Can't Be Seen Outside If Statement
Aug 12, 2011I need to call this function saveBase from more than one place so i decided to send a number in variable x to know of what type to create the object named Model. however when it's within the if statemet i keep getting the error that model is not declared ![code]...
View 6 RepliesAdd A Handler To A Publicly Created Object?
Feb 22, 2012I'm adding some functionality to an app that was made a few years ago and I need to raise an event when the tabcontrol is clicked. However it would seem because the control was created publicy I can't add a handler to it? I never ran across this before. I stripped the code down to the bare essentials. As you can see in the image, if I Dim the control within the sub I can add the handler. But any handler created for the publicly created control fails.
Is there another way to create the hander in this case?
Retrieving A Tag Of An Object Created At Runtime?
Dec 10, 2010My
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?
Saving A Created Object On A Picturebox?
Apr 3, 2010I need to save a object that i programing to be drawed onto apictureboxPictureBox1.CreateGraphics().FillEllipse(Brushes.Blue, ci)how do i save the object as a image or the picturebox? And then be able to open it again?
View 7 RepliesChange An Object (textbox) Created In Runtime?
Nov 1, 2010I 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]....
Change Properties Of A Dynamical Created Object?
Aug 11, 2011I want to make a lotto bulletin and i created the buttons in the program. I have assigned a handler to it and that is working also but how can i change the background of this button later on in the program ?
'/ teken 10 groupboxen
For i = 0 To 1
For y = 0 To 5
[Code]....
Error: A Graphics Object Cannot Be Created From An Image
Jun 6, 2011I have a scanned document in my system. It's a tiff file. You will see below the code i have written. The problem is that i get an error message. The message is like this "A Graphics object cannot be created from an image that has an indexed pixel format." [Code]
View 3 RepliesEvent Procedure For Object Not Created Until Runtime?
Nov 3, 2009how would I create an event procedure for something not yet on a form?
View 3 RepliesUse String As A Previously Created Object Instance?
Aug 9, 2009Not sure exactly what I need to do to make this work, so my description may be lacking at first.Essentially I am writing a program launcher that recreates itself each time on load. It pulls the data regarding the tabs and buttons from an SQLite database and builds itself dynamically at run time. I get my problem when I pass the tab name through to the function that creates the buttons. I need the name to pull the right set of buttons from the database and I then tried to use the name to place the buttons on the right tab when I create them, but the debugger calls it a null reference because it doesn't point correctly to the tabpage that I'm trying to make it point to (at least that is what I'm guessing). Any ideas on how to make this work right?
[Code]...
.net - Create An Event Handler For A Programmatically Created Object?
Sep 3, 2011Say I have an object that I dynamically create. For example, say I create a button called "MyButton":
[Code]...
Stopwatch - Selecting The Most Recently Dynamically Created Object With .NET?
Feb 3, 2012Below is some code that I'm using to create objects with Visual Basic:
For indexCounter As Integer = 1 To TotalParticipants Step 1
participantClock = New Label
participantClock.Size = New Size(100, 20)
participantClock.Name = "participantClock" & indexCounter
[code]....
I'm creating a label, a button, Timer, and Stopwatch. (Though I have sinking feeling I don't need BOTH a timer and stopwatch since I'm counting time.)What I would like to do, is create the label and set that label's text to be the value from the stopwatch. The button that will be created will stop THAT stopwatch.
The problem that I'm having is that I cannot call the stopwatch by name since it wasn't created yet and VB throws a hissy fit at me for it. (After all it wasn't really declared.)So the question becomes, how do you call the most recently dynamically created control and assign events using that control. If it's not possible to do, I do not mind dumping the form and starting over creating 30 stopwatches instead (but I'd like to avoid that, if possible).
VS 2010 Create Event For Programmatically Created Object
Feb 17, 2011I'm creating a textbox at runtime, which works fine, but now I need it to have a selection_change. How do I do that?
View 9 RepliesUnable To Change Properties Of A Created Object Due To Permissions Error?
Jun 8, 2009I am trying to create a function that will return a pen(System.Drawing.Pen to be exact) that will have a random color and width. I thought that something like this should do the trick:
Public Function random_pen() As Pen
Dim clr As Color = Color.FromArgb(255, random_rgb_color_gen, random_rgb_color_gen, random_rgb_color_gen)
Dim pn As Pen = Pens.PeachPuff 'just a random color else i get a null exception...
pn.Color = clr ' the error is here
[Code].....
However when the code is run i get an Argument Exception with the error message:"System.ArgumentException was unhandled Message="Changes cannot be made to Pen because permissions are not valid.""
VS 2008 - Error With Arraylist In My.Settings - Object Reference Not Set To An Instance Of An Object
Mar 14, 2010The issue is when I try to add a new item to the ArrayList with the following code, it gives me an error:
vb Private Sub btnLabelAdd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLabelAdd.Click
Dim result As String = InputBox("New Filter Label:", "Label List")
[CODE]................
Object reference not set to an instance of an object.
I'm not really sure what I'm supposed to be doing with this. It's a new setting I just added and it's empty, so I'm not sure if that has anything to do with it or not. Anyone know what's going on and what needs to be done to get it to accept a value and not want to be "initialized"?
VS 2008 Error - System.NullReferenceException: Object Reference Not Sent To An Instance Of An Object
Oct 23, 2009I have recently gotten my hands on a free, open-source IMAP connection API.So far, I have been successful in creating a connection to one of my accounts.Where I'm getting stuck is retrieving folders and/or emails from those folders.Does there happen to be anyone here that is familiar with this API, or even Gmail (particularly the folder structure for IMAP)?
If not, here is a link to the DLL that is listed on sourceforge and the company's website that created it (if you feel like testing):
Koolwired
Sourceforge - Koolwired API
I have created a test account so feel free to use the code below without worrying about username/password issues; I'll just delete it when I'm done with it.Here is the code I have made so far for making a connection:
Dim gSession As New Koolwired.Imap.ImapConnect("imap.gmail.com", 993, True)
Dim gAuthenticate As New Koolwired.Imap.ImapAuthenticate(gSession, "imap_test@serysoft.com", "imap_test")
Try
[code]....
When I run that code, I get an error that states:System.NullReferenceException: Object reference not sent to an instance of an object. (The bold line in the above code).
Now, I'm not sure exactly what that means. Does that mean it tried to access the server and "INBOX" doesn't exist so it gets returned a NULL value? Or is it possibly the coding itself?Maybe the Gmail folder system is weird due to the fact they use labels (even though from what I have read online, the labels act as the folders in the IMAP system).
VS 2008 - Not Being Able To To Load The Database Created In MS SQL Server2008(SQLEXPRESS) Onto 2008
Mar 12, 2010Using VS2008 as frontend and MS SOL Server2008 as backend... a database is created in MS SQL Server2008(SQLEXPRESS). Now the problem is i am not being able to to load the database created in MS SQL Server2008(SQLEXPRESS) onto VS.Net 2008...
View 32 RepliesVS 2008 FindControl - Error : Object Reference Not Set To An Instance Of An Object
Sep 15, 2010What is the problem in below code.
d Public Sub filltextbox(ByVal dlist As String) Dim tb As TextBox = CType(Page.FindControl(dlist), TextBox) tb.Text = "hello" End Sub
Error : Object reference not set to an instance of an object.
VS 2008 System.NullReferenceException: Object Reference Not Set To An Instance Of An Object?
Apr 26, 2011look after the error i'm having.
module1.vb
Imports System.Data.SqlClient
Module dbconn
[code]....
Open Html Files In Internet Explorer That Is Created In Editor That Is Created?
Jul 26, 2011I have an editor created invb.net that creates html files. And when i click the button run , the Internet Explorer opens my file that is inside the Richtextbox.
View 3 RepliesVS 2008 : Error - Object Reference Not Set To An Instance Of An Object
Dec 5, 2010I create one function to run any select query. and return the OdbcDataReader type.But some time if there is no data it through error : Object reference not set to an instance of an object I need to know how i can control if there is no data.
Public Function Select_From_AnyTable(ByVal sqls As String, ByVal ConStr As String) Dim conn As OdbcConnection conn = New OdbcConnection(ConStr) Dim cmd As OdbcCommand = conn.CreateCommand() conn.Open() cmd.CommandText = sqls Dim reader As OdbcDataReader = cmd.ExecuteReader While reader.Read() Return reader End While conn.Close() End Function Dim ei As OdbcDataReader = Select_From_AnyTable("SELECT loginname from usertable limit 1", conStr) msgbox(ei.item("loginname "))
If there is data it work well but if no record found it through the error.
VS 2008 Convert A DataGridViewRow Object To A DataRow Object?
Aug 31, 2009Is there a way to convert a DataGridViewRow object to a DataRow object?
View 2 RepliesVS 2008 Create A Bitmap Object From A Graphics Object?
Jun 3, 2009i have drawn on a e.graphics object and now want to transfer the drawn stuff onto a bitmap object how can i do this?
View 2 RepliesVS 2008 Error : Object Reference Not Set To An Instance Of An Object
Mar 21, 2010Like every other program that you make when you code a button to open the next form it should open right. Well not in my case. I don't understand the problem that Visual Basics is not seeing my next form that I'm trying to open. When its in the Solution Explorer plain as day. Error below.An error occurred creating the form. See Exception.InnerException for details. The error is: Object reference not set to an instance of an object.show is not set to a object. All its doing is opening the next form. Ive use this code over an over. Now its giving me this C.O.S. error.
View 27 RepliesVS 2008 Error: Object Reference Not Set To An Instance Of An Object
Nov 16, 2010Basically all I am trying to do is to insert data entered in a text box(description) on the application form into database(sql2008) in vb.net. The vb code I wrote is below:
vb.net
Protected Sub Save_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Save.Click
Dim note As String = Description.Text
[code]....
However when I click on save button, I get following message:
System.NullReferenceException: Object reference not set to an instance of an object.
VS 2008 Error: Object Reference Not Set To An Instance Of An Object?
Nov 30, 2010What in this code might be causing this??This part of the code is Hilighted as causing the error.
My.Settings.Item(Holiday_" & i) = DirectCast(Me.Controls("ComboBox" & i.ToString), ComboBox).SelectedItem
Public Sub btn_Update_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
[code].....