Opening Form - Expression Cannot Be Converted To Type TextBox

Mar 13, 2011

A week ago, I encounter an error while doing my project. I failed to open certain form in vb.net. While clicking a button to show the form this will came out.
"[An error occurred creating the form. See Exception.InnerException for details. The error is: Argument 'Expression' cannot be converted to type 'TextBox']".

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Error : 'AddressOf' Expression Cannot Be Converted To 'Integer' Because 'Integer' Is Not A Delegate Type?

Aug 11, 2011

I faced an error when upgrading VB6 code to VB.NET. The error occurs at AddressOf WindowProc

AddressOf expression cannot be converted to 'Integer' because 'Integer' is not a delegate type

My declaration for SetWindowLong is:

Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA"(
ByVal hWnd As Integer,
ByVal nIndex As Integer,[code]....

What is the reason for the error I get?

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'AddressOf' Expression Cannot Be Converted To 'Integer' Because 'Integer' Is Not A Delegate Type

Aug 3, 2009

I am a newbie in VB and I got a piece of code which can display the current running program. I need to use that in VB2005 and I got the below error message. Can anyone help how to fix it?[code]

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'AddressOf' Expression Cannot Be Converted To 'integer' Because Integer Is Not A Delegate Type

May 13, 2009

I'm trying to convert a VB6 project to .NET, but I get problems with some callback functions, and the following message comes up: "AddressOf' expression cannot be converted to 'integer' because integer is not a delegate type" I've seen several solutions to similar problems like this, but I am not able to understand this issue with delegates.

After the conversion, the code look like this:

Declare Function vsmsgwSetDataPackageCB Lib "vsmsgwW.dll" (ByVal PACKAGE As Integer, ByRef arg As Integer) As Integer
Dim arginitP As Integer

[Code]...

Which gives the error: Method 'Public Function PackageCB(HisNodeID As Integer, ByRef data() As Byte, ByVal length As Integer, ByRef arg As Integer) As Integer' does not have the same signature as delegate 'Delegate Function DelegatePackageCallback(hwnd As Integer, lparam As Integer) As Integer

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'AddressOf' Expression Cannot Be Converted To 'Object' Because 'Object' Is Not A Delegate Type

Sep 1, 2010

I have user control which has one button. To handle click event of button I have added following code in usercontrol.

Public
Sub ChangeClickHandler(ByVal
[Delegate] As EventHandler)

[code]....

Now, I want to handle this click event where I call the this usercontrol. I call the usercontrol through reflection so I get the control in a form of object.

Dim button as object button.ChangeClickHandler(AddressOf mymethod), this line gives me error "'AddressOf' expression cannot be converted to 'Object' because 'Object' is not a delegate type."

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Opening Form By Type Or Name

Jul 17, 2003

How to create an instance of a form if it is not know in advance which formtype has to be opened. If you want to skip the chitchat: the .NET code example is at the end of this post. First the Symantec: when we create a new form, this form has a name. If we refer to that name, we actually refer to the name of the type of object that is just created. When to use of course when reading the subject you might think: why not just pass the form to a parameter that takes a form (or control/object)?

The answer is: you don't when it is not sure, when or if a new instance of the object has to be created or, as mentioned, when the procedure is called it is not known which class has to be created. You could of course hold a bunch of created objects, but that would be a shameless misuse of memory. Imagine the following scenario (seen something like this in a post, but can't find it anymore):

You have a class that is able to trap an event, say the doubleclick of a textbox, and has to open a form when it occurs. If it's always the same form, that's easy, but what if you want it to be determined during runtime? This is a quite common story: doubleclick on article opens the detail form of that article, doubleclick on supllier opens that particular form. If you use a form variable, how do you say to the class which form should be opened? This will not work

Code:
Dim FormToOpen as Form 'you don't want to open it right away, you want to know when the time comes what form to openFormToOpen = Form1You could say FormToOpen = new Form1, but then 1. an instance would be immediately created, even if it never will be used: memory leak. 2. you can never close the form, you'll always have to use the same instance created when setting the form. Consequently, you can never open more than 1 instance using this way.

The solution: use the type. If you know the type, the Activator class will enable you to open (and return) an instance of that form at any time and as much times as you like. (The Activotor class exposes the function CreateInstance which returns an instance of the specified object)The following code creates an instance of the type form1 and shows it.

Code:
CType(Activator.CreateInstance(GetType(Form1)), Form).Show()Or for better readability, the same code split up:
Code:
Dim FormToOpen As Type
FormToOpen = GetType(Form1)
Dim frm As Form = CType(Activator.CreateInstance(FormToOpen), Form)
frm.Show()

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Apr 8, 2011

I'm trying to code a program but this error repeatedly shows up and I can't for the life of me figure it out EValue of type 'String' cannot be converted to 'System.Windows.Forms.TextBox'. It appears in relation to this code

[Code]...

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'AddressOf' Expression Cannot Be Converted To 'Integer'

Oct 13, 2009

im converting a vb code to vb.net from simpleocr site but i can't run this code because of error in sub calling (ret = objOCR.OCRSetOutputHandlerX(AddressOf myOutputHandler)) :

Code:
'AddressOf' expression cannot be converted to 'Integer' because 'Integer' is not a delegate type.here's the code:

Code:
dim strOCRResult as string = ""
Private Sub DoOCR (filename as String)
Dim objOCR as SimpleOCR 'SimpleOCR object

[code]....

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'AddressOf' Expression Cannot Be Converted To 'Integer'?

Jan 23, 2011

im converting a vb code to vb.net from simpleocr site but i can't run this code because of error in sub calling (ret = objOCR.OCRSetOutputHandlerX(AddressOf myOutputHandler)):

Code:'AddressOf' expression cannot be converted to 'Integer' because 'Integer' is not a delegate type.I googled around but i did not found any solution here's the code:

[Code]...

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May 23, 2012

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which is passing from vb6 like

VcMethod(addressof vb6Method)

I am getting error ddressOf expression cannot be converted to integer.I know addressof working different in vb6 it givie value in int which is function pointer. Please suggest how can I get value of fuction pointer in vb.net or any other solution in this situation.

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Nov 21, 2010

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[Code]....

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Nov 19, 2010

I get this error "Late binding operations cannot be converted to an expression tree."

At all my x.NAME) lines !?

<div>Navn:<%:Html.EditorFor(Function(x)x.Name)%></div>
<h3>Adresse</h3>
<div>Linje1:<%:Html.EditorFor(Function(x)x.Line1)%></div>

[Code].....

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Jul 26, 2010

I currently have a View in MVC where I pass a single set of data to the view. However, I've come across a problem where I am having to use a LINQ query within a For Each loop in the View to pull out additional information from a SQL View of data from another DB.

The error I'm getting is Late binding operations cannot be converted to an expression tree.

The particular snippet I'm encountering the error on is:

[Code]...

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Feb 17, 2012

I have a bunch of Excel files full of research data. Everything is strait forward: rows of research categories and columns of research parameters. I want to create a simple search form that allows opening any of the spread sheets that contains the type of data that I specify. For example, I would choose a parameter

[Code]...

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Feb 11, 2010

I have a project in VS2008.Net3.5. I have 3 forms in total. The Sub Main() in Module1 first calls the Form1. Then Clicking Button1_Click event in Form1 opens up Form2. In Form2 I have a text box that I will fill out from Form3. But when I am Clicking Button1_Click event in Form1, it can't keep Form2 open but it opens up Form3 directly. I dont want this. I want to open Form2. In Form2 I will press the textbox and then we have Form3 open. But this is not working.==============

Module Module1
Public frm1 As Form1
Public Sub Main()

[Code]....

The Sub Main() in Module1 first calls the Form1. Then Clicking Button1_Click event in Form1 opens up Form2. In Form2 I have a text box that I will fill out from Form3. But when I am Clicking Button1_Click event in Form1, it can't keep Form2 open but it opens up Form3 directly. I dont want this. I want to open Form2. In Form2 I will press the textbox and then we have Form3 open. But this is not working.

I knew that in Form2 the first focus is going to the textbox and it then opening the Form3 for the GotFocus method. How can I move the focus to other control in Form2 instead of the default focus to my textbox. Or is there other event method other than GotFocus?

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Mar 21, 2011

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Jan 5, 2012

I am trying to create a program with vb.net. I am getting the following error in the form1.designer.vb and so I am not able to run the program. Its urgent. Error1Value of type 'String' cannot be converted to 'System.Windows.Forms.TextBox'.C:\Documents and Settings\Srivathsan\Local Settings\Application Data\Temporary Projects\Cyber Cloud\Form1.Designer.vb49119Cyber Cloud And it says that the error is with this line?

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Nov 7, 2009

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[Code]...

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Mar 14, 2012

I am accessing autocad commands via vb.net express

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I can access other commands fine, but the one above I get error "Prompt cannot be converted to type string"

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Oct 10, 2010

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Apr 11, 2011

I'm a novice VB programmer and I am getting the above error when I try to display the results of one of my Stored Procs in SQL Server which doesn't need any parameters.

My code excerpt:
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SQLCmd.CommandType = CommandType.StoredProcedure
SQLCmd.Connection = GlobalFunctions.GlobalF.GetDevSQLServerStoredProcedure(SQLCmd.CommandType)
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[Code] .....

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although the following gives the error I stated in the title :

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Nov 11, 2011

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Module Module1
Sub Main()
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[code].....

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Sep 30, 2011

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Jan 2, 2012

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Public Class MortgageCaluclator17
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[CODE]...........

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To start, I have the following class:

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[Code]....

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Feb 10, 2010

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May 6, 2012

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[Code].....

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[Code]...

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Jan 25, 2012

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[Code]...

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[code]....

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Oct 8, 2010

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CODE:

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then i see this error:Value of type 'Integer' cannot be converted to 'System.Drawing.Color'

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Sep 2, 2010

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Here's the code that explains what piccolor.image is, it's a picturebox on form1 that has an image
readpic(Form1.PictureBox1)
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[Code] .....

And Imports System.Runtime.InteropServices is on the top of the module, if u need more code then let me know. Also I wonder if there is a way to bitblt directly to a pixel array.

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Code:
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[code]....

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