VS 2008 Object Casting Error When Clicking On A Web Browser Bookmark?
May 31, 2010
Unable to cast object of type 'System.Windows.Forms.ToolStripButton' to type 'System.Windows.Forms.ToolStripMenuItem'.This is the error, when I click on the bookmark(When I add the bookmark, It's a non-clickable menu item; the next time i debug it, it becomes a clickable url(button)
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
...
Call minginimi()
End Sub
I've got a project called Service.Inside the project, i've got 2 windows classes.ClassA is the main windows class which opens up when I run the program.On ClassA, I've got a button which, when I click it, opens up ClassB which is the other windows class. Inside the button's eventhandler (click), I've got a string which contains the name of ClassB's class ie "ClassB". I will probably get this from a table. Is it possible to initiate the object ClassB without using if statments to check what the type of object is. In the code below, i've managed to create a o of type object, but i need to new it with the ClassB
vb.net Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
I'm trying to click a link in an embedded browser based on the link ID. However, I keep getting a NullReferenceException error. I have not declased anything from the code. Just dropped it in from another website. Any ideas?
Private Sub WebBrowser1_DocumentCompleted(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles WebBrowser1.DocumentCompleted For Each link As HtmlElement In WebBrowser1.Document.Links If link.Id = "ctl00_mainContentArea_submissionFileListTable_ctl02_documentHyperLink" Then WebBrowser1.Navigate(link.GetAttribute("href"))
I have two custom objects.On of them inherits the other one, appends few more properties and methods, ovverides some other.When I try to cast the Parnet Object to Child I receive an error that it could`nt be done.
im trying to add a bookmark option to my browser and ive no idea were to start. Im just looking for something simple , that ability to add/remove a bookmark .
Im using a tabbed web browser , here is an example of a code that im using on 1 of my buttons , maybe you guys might know the code im looking for to add the bookmark feature.
Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).Navigate(TextBox2.Text)
In a Word automation project in Visual Basic 2005, I am trying to reference a bookmark in the bookmark collection using its index. However when I try to do this, the program aborts with the message that "The requested member of the collection does not exist". I am using the index so that I can refer to the subsequent member of the bookmark collection from the one matching my selection criteria. Here is a snippet of code which causes the error. In the listing below, the Debug line causes the error.
I'm new to visual basic & have learned many new things in such a short period of time from being on the MSDN forums. I have learned particularly in the subject of automating web browsing control using the getattributes etc., but I have tried everything that I have seen in the forums to auto click the "Settings" link in a created gmail account and then have the browser automate the "Forwarding" to another gmail address. I haven't found a solution anywhere to accomplish this.
So here is an account to try out in which this should only take a few mins to a veteran coder:
I have an object that inherits from an interface. I can create and return the following:
Dim o As IRequest o = New Request Return o
This works fine. Now I want to return a List(Of Requests), so I try the following:
Dim o As List(Of IRequest) o = New List(Of Request) Return o
The error below is being given on o = New List(Of Request)
System.Collections.Generic.List(Of MyObjects.Request)' cannot be converted to System.Collections.Generic.List(Of MyInterfaces.IRequest)'.Consider using 'System.Collections.Generic.IEnumerable(Of MyInterfaces.IRequest)'
i have the following code which walks through an Excel file and this works fine note that the following line does work well (folder is being set earlier in the code)
i'm still a rookie about this vb.net stuff and i want to fix some bugs..and i don't know what's the problem of it..there are pictures been attached here.. it's a math project and i simply used event LEAVE because i dont know if what will be the right code if i just use button key.the clicking should be sequence according to the answers.. if you can suggest on how to button this with just the click of the button the answers will
I got an error when I clicked on my button.The error is as below An error occurred creating the form. See Exception.InnerException for details. The error is: Unable to cast object of type 'System.EventArgs' to type 'System.Windows.Forms.MouseEventArgs'.[code]
Here is a test program I wrote to explore a facet of object casting ... Module Module1 Sub Main() Dim class1 As MyBaseClass = New MyBaseClass() Dim class2 As MyInheritedClass = New MyInheritedClass() Dim class3 As MyBaseClass = Nothing [Code] ..... The problem comes with the TryCast statement on class3. My intention is that class3 remains as a baseclass, but when the TryCast is applied, class3 morphs itself into an Inherited class which is not what I wanted. So is there a gap in my OOP/VB.NET knowledge and this action is legitimate or should class3 still be regarded as a base class?
get around this. I have a data base field that is a decimal data type and I want to display it in a text box with the following txtWeekdayRate = CType(RoomsDataRow!WeekdayRate, TextBox)I get the following error when I run my program.Unable to cast object of type 'System.Decimal' to type 'System.Windows.Forms.TextBox'.
In VB6 I could use an asterisk as a wildcard when searching the object browser. For instance, searching on "c*Report" would find "cFooReport" and "cReport". I can't seem to do the same in VS2008, am I just missing something obvious?
when i select a bookmark from a listbox on another form how do i get it to automatically navigate to that webpage?This is the code im using to select the bookmark and load it to the webborwser textbox
Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click If ListBox1.SelectedItem = "" Then
I've been able to click buttons normally by [code]But I'm up against this class:button_link within a DIV which is giving me grief. It won't getelementbyId using send_button and it's not in a form.[code]So I'm looking for a way to click a button within the DIV.
The 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"?
I 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).
I 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.
Like 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.
Basically 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.
What 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)
I recently installed VS 2010 Premium. Since then I can not publish any of my projects due to this error,[code]I just created a new Visual Basic Windows forms application and without adding any code published the project. (I do get this in my previous working projects also).[code]If you later install a more recent service pack, this security update will be uninstalled automatically.url...
I am having trouble with my bookmarks on my web browser. On my bookmark form theres a listbox, when I save a webpage to the listbox I want to be able to select the url click a button (Load Bookmark) so that it loads in my main webbrowser (textbox1).
