Make A Class Recognize That An Interface Found In Separate File Exists?

Mar 8, 2010

I've made an interface called ApprovalEvent in a separate file with the namespace myproject... I've also made a class called PurchaseOrder... it's also in the same namespace, just in a separate file. Whenever I try to make PurchaseOrder implement ApprovalEvent it always says that ApprovalEvent is undefined...

How can I make the class recognize that the interface exists but is in a different file?[code]...


Make A Shared Function For Form Load In A Separate Class File?

Jan 9, 2012

i would like to have a shared function in a separate class file to address the form location . but i dont know how can i get this to work. if i use this below code in my form its working . but i cannot move this to a class file.

Shared Sub Formlocation()
Me.StartPosition = FormStartPosition.Manual
Me.Location = Screen.GetWorkingArea(Me).Location
End Sub

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.NET Multithreading / Calling Invoke On A UI Control From A Class In A Separate Class File?

May 13, 2011


Two files - TestClass.vb, myForm.vb

TestClass.vb looks as follows:

Imports System.Threading
Public Class TestClass
Private myClassThread As New Thread(AddressOf StartMyClassThread)


The result:Application runs, no errors or exceptions.Displayed is the listbox and the Start button.I press the start button and a msgbox says "Not Invoked" as expected and upon clicking OK to that msgbox "Start Button Pressed" is added to the Output listbox control.Immediately following that the msgbox pops up again and says "Not Invoked". I was expecting "Invoked" as a separate thread is trying to use the Output listbox control.Of course this results in the Output.Items.Add being attempted which results in no visible result as the thread is not allowed to directly update the UI control.

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File Download In A Separate Class?

Nov 6, 2008

How can I move the following to a separate class for repeated use ? (the problem is that it uses response object)

' Download/View a given file
Sub downloadFile(ByVal sFile
As String)


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Lisbox In A Separate Class File In Vb

Aug 5, 2011

I have a listbox in separate class like this [code]


How can I use that list box that I have created in that class on this form or I want to show that listbox on my form?

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Jan 2, 2012

i want to make a class for a custom button for which the user of the class can choose his own images for Normal, mouse over and mouse down state.

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Jan 15, 2012

After creating a project in how to make a separate file so that by clicking on the file the project should directly execute

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Aug 11, 2009

How can I make sure a file exists on my Desktop?

I use this code but It doesn't work ...

MessageBox.Show(IO.File.Exists("DesktopFolder" & "Myfile.lnk").ToString())

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C# - Write All The Control Events In A Separate Class File In Different Layer Rather Than In Code-behind Of Webpage?

Nov 16, 2011

Can we write all the control events in a seperate class file in different layer rather than in code-behind of web-page ?

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Recognize A Generic Class?

Mar 19, 2010

How can I recognize (.NET 2) a generic class?

Class A(Of T)
End Class
' not work '
If TypeOf myObject Is A Then

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VS 2010 ManagementObjectSearcher Won't Recognize As A Class

Jun 7, 2011

VS won't recognize this as a class, I get the "Type 'ManagementObjectSearcher' is not defined." error. Usually when this happens I just need to import something, in this case it's System.Management, however this doesn't do anything. I'm quite new to programming so it's probably some very simple mistake or misunderstanding.


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Interface Class (IUser) Which Is The Interface Of Class User?

Jan 17, 2009

I have an interface class (IUser) which is the interface of class User. Now, i want to put these into an IList but am confused as to how i should declare the IList:Dim userList As IList(Of IUser) = New List(Of IUser) Dim userList As IList(Of User) = New List(Of User) Dim userList As IList(Of IUser) = New List(Of User) Dim userList As IList(Of User) = New List(Of IUser) when instantiating should you always use its implementation; and when using it as a type use its interface?

And when im creating a new user should i use: Dim myUser as IUser = new User?

View 3 Replies View Related - Visual Studio Does Not Recognize Dynamic User Control Class?

Jul 15, 2010

I have created a user control which is inside a folder called Controls and the class is a partial class which inherits from Web.UI.UserControl. Now from my page which is one level up I just try to access the method inside the usercontrol and so trying to cast it as the type of user control.

But I get build errors. It just cannot recognize that class. I get Type not defined error. But at times it has recognized the class. Dont know why it does that.

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Interface And Graphics :: Link A Class / Object To An Interface?

Apr 21, 2010

I'm trying to make a .dll that contains a lot of basic functionality that a program can use. Currently i am trying to use interfaces to make a lot of this functionallity independend of the program using it but i hit a snag. The Basic idea is that a programmer will create his own object using the interface discribed in my .DLL file. Then implements those functions as he likes. He can then instanciate a controller (found in the same DLL) and sends his custom object implementing the interface to that Controller. The controller can then be started and will take over all the work. I do not know what type of object is send to the controller and idealy i want to program it in such a fashion that i shouldn't care as long as the object send implements that interface.In code I am trying to achieve the following: (quite simplyfied)

Public Interface MyInterface '<----Decleration of the interfaceFunction GetData() As Integer
Function SetData(Data As Integer)
end interface


this propperly. I know that the second i set the interface adaptor in the Controller VS comes nagging that it can not be converted to a "MyInterface" Class. Obviously i am doing something wrong. I can change the datatype that the controller expects to the "MyController" type but that would completely ruin the whole idea of flexibillity. I am hoping someone sees what i am trying to do and can point out where i made the thinking error.

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Interface And Graphics :: Use A Treeview Control To Separate Them Into Sophomore?

Aug 12, 2010

I have a list of about 150 students that I would like to organize. I need the user to be able to select individual students, and I was hoping to use a treeview control to separate them into Sophomore, Junior, Senior(No freshmen) so that way it is easier to locate a single member.

My problem with this plan is that checkboxes are beside both the root and the child nodes and I only want the user to be able to select the individual students. So my question is is there a way to only put checkboxes beside the students or is there another control that can achieve the same effect?

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Interface And Graphics :: Make A New Button For Each .exe File In A Directory?

Dec 12, 2008

im making a program that needs to make a new button for each .exe file in a directory? Kinda similar to PortableApps program that will recognize each program in the directory.

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VS 2010 Make VB Console Recognize The Color Red And Green At XY-axis?

Jul 23, 2011

How do I make console recognize the color red and green at XY-axis? I start up the program. The program check...if X450 and Y503 has a green pixel or something like this. If X450 and Y503 has a red pixel or something lik that...goto line number. You know what I mean? I took the X450 and Y503 as random numbers.

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Add / Implement An Interface To An Existing Class Without Changing Code Anywhere That Call The Class And Functions

Mar 1, 2010

I need to create unit testing project for my current website. The currentw ebsite si written in VB. All unit testing examples are using interface to create mock object. My current VB class does not implment any interface. Can I add interface and implement it to my current class and functions without affecting or changing codes to any pages in my website that call the functions? For examples my current class is like:


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Interface And Graphics :: Making A Custom Class That Mocks The System.Drawing.Rectangle Class?

Jul 6, 2010

I'm making a custom class that mocks the System.Drawing.Rectangle class because the Rectangle class doesn't have a name property. I need a name property because I am adding all of my rectangles to a collection and I need a little more info stored than just their locale and size. So I changed the _onPaint event but nothing is working out when I run the program?

Public Class Rectanglar : Inherits UserControl
Public BackgroundColor As Color = Color.Blue
Public Sub New(ByVal name As String, ByVal XY As Point, ByVal Widthy As Integer, ByVal Heighty As Integer)


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.NET Class Inherits A Base Class And Implements An Interface (works In C#)?

Apr 9, 2010

I am trying to create a class in VB.NET which inherits a base abstract class and also implements an interface. The interface declares a string property called Description. The base class contains a string property called Description. The main class inherits the base class and implements the interface. The existence of the Description property in the base class fulfills the interface requirements. This works fine in C# but causes issues in VB.NET.


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Does An Inherited Class Automatically Implement An Interface From Its Base Class

Jun 10, 2011

Suppose I have piece of code like this:

Public Interface ISomething
End Interface


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Overload Operator In Generic Class With Generic Interface Of Super Class And Inherit Class?

Jan 21, 2010

I can do this without problem.

Class A
End Class
Class B : Inherit A
End Class
Dim Obj1 As A = New B

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C# - Recognize Barcodes In A PDF File?

Nov 10, 2011

I have a PDF file with n pages, I need to split it to n files. On each page I have barcode, I need to recognize/read barcode. If I have two files with the same barcode I need to merge them.Can anyone recommend an .net component or exe or something else that will help me? It can be commercial.I have tried:itextsharp - only split and merge files dotimage/aspose/idautomation - only recognize barcodes and it very expensive a-pdf - not always recognize the barcode and not merge/split two files.

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Can't Add Tabpages From A Separate Class

Nov 22, 2009

Good evening folks, I'm building a program that is threaded. While I can get the thread to work no problem, I can not seem to add pages to my tabcontrol from the class I'm using. Any idea's on what I'm doing wrong?frmMain is loaded first. Then the idea is to load the other tabpages using a separate thread as they take awhile.[code]

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Inherite Class From Separate Dll?

Jan 20, 2011

I am having following Projects 

Public Class Class1
Public Sub MyMethod()


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Notifyicon As A Separate Class?

Feb 11, 2011

I don't want my application's main form to be displayed when it opens; I just want the notifyicon control in it to show in the taskbar.This is the code I have been using:

Module mdlStartup
Public Sub Main()


The NotifyIcon control is in my frmMain. However, when I run my program I get mulitple instances of the Notify Icon being displayed. I even get two frmMains getting launched if I try clicking the other tray icon that has been made. I'm guessing this has to do with the New instance.If that's the problem, is there a way I can move the notifyicon control to some completely separate class?

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Class Inherit From Another Class And Implement An Interface?

Jun 18, 2009

class inherit from another class and implement an interface?

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VS 2005 Class Contain Another Class Within It - Interface And Property?

Jul 29, 2010

I know that an interface can contain another interface within it.But;can a class contain another class within it?Can an interface contain another interface within it?

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External File Will Not Recognize Its Own Location

Jan 10, 2012

I have written an application, named vbapp.exe. And I would like to use vbapp.exe to shell an external .exe file and this external .exe will create a file in the folder in which the external .exe file is located.However, the external .exe file will not recognize its own folder, on the contrary, it will think that its own folder is where the vb application, vbapp.exe, is located.

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Recognize A Video File From A Picture?

Feb 19, 2009

which is the best way to recognize programmatically if a file is a video or a picture a part from the fil exstension?

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Make Update On Class And Then Put It As DLL File In The File Of Program?

Nov 20, 2011

I create a project using query sql ( Select, Update,Delete,Insert ) in many various way. example by Select with condition ..etc someone work in programing field. tell me that you are not profession in using , because you have to use OOP instead all of these Sql query. because if you want to make any update on your program after start to work on the Pc you will open your project on design and change the code. but in OOP you will make update on class and then put it as DLL file in the file of program.

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.net 4.0 - Separate Lists From Same Class Copy Each-other?

Feb 7, 2012

Im trying to get a ComboBox that would list all the pc on a netowrk, (Domain and/or WorkGroup)the idea is so that when i start typing the name of the pc list would come up with sugestions (nearest match)


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Separate Lists From Same Class Copy Each Other?

Feb 23, 2012

this example shows my problem. I'm using 2010

Public Class Form1
Public Class BonoType
Public name As String


What happens is "Goose" is not only stored in tory(1) but also in tory1(1), how can I stop this.

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Set Print Properties In A Separate Class?

Apr 18, 2009

I'm writing a program and rather than having all the print properties in the main form I'd like to have them setup in a seperate class. I've done printing before by setting all the properties in the form where all the controls are located with no problems but this has me stumped. Reason for doing this is just to try and organize the program a little better and there are several areas of the program that will have different data and format to print so this will cut down on having potentially hunderds if not a thousand lines in that one area. I can't imaging that this wouldn't be possible.

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Update UI From A Class In A Separate Thread?

May 4, 2010

The code below works fine when I put it in form1.vb and change "form1" to "me" but I can't seem go get it to work from my class.

Imports System.Threading
Public Class Class1


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.NET: Ambiguous Class Name Error When No Ambiguity Exists?

Aug 16, 2010

A client of ours reported that when trying to use our .NET .DLL in VB.NET they receive the error:error BC31429: 'OurClass' is ambiguous because multiple kinds of members with this name exist in namespace '' I've also been able to reproduce the error with a dummy project containing the single line of

Dim x as Normally this is because there are several types with names differing only in case. But in this case there is no such ambiguity. OurClass is a unique name not only in the specific namespace but in the whole assembly and any other assemblies referenced by the project. Reflector also shows this. There are also no class members with the same name, also verified by Reflector.

Also a weird thing is that the error wasn't there immediately after I created the dummy project, and then it suddenly appeared and now it doens't go away anymore. In fact I didn't even change anything between the two recompiles from which the first one worked, and the second didn't.

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Determine If A Form Class Exists At Runtime?

Feb 17, 2010

I have the name of a form in a string variable, e.g. "frmOptions". I want to:

1) get the fully qualified name of the form

2) determine if the form exists in the application

3) create an instance of the form

4) show the form

I know that using reflection I can do #3 this way, but I need to get the fully qualified form name first[code]...

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VS 2010 Recognize Time And Date In CSV File?

Mar 28, 2011

I'm building an application in which a certain CSV schedule is read and searched for time and date values.

I want to read each cell in the CSV file with a streamreader and have VB determine if the contents of the cell represent a date (like 31-10-2011), a time (like 22:30) or random text data which is not formatted like a date or time.

How can I make VB recognize a string as either a date, a time or neither one, so I can use this string formatted as Date, Time or discard of it?

The contents of the CSV file will look something like this:


Although the CSV file will never contain much data, the position of the date and time fields in a row may vary, so I cannot tell VB which cell to read as date/time. It has to recognize the value as date, time, or unusable text.

Dim CSVReadline As New System.IO.StreamReader(schedule.csv")
Cellcheck = CSVReadline.ReadLine()
String = Cellcheck.Split(";")
For i = 0 to 10
Scheduledate = String(i) ............ etc.

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.net - Separate Metadata From The Class Definition Across Assemblies?

May 24, 2011

I'm working a business layer (separate assembly) that will contain various business entities used in multiple client applications. One of the client applications is a WCF app that will need to serialize these entities. In order to properly serialize the entities, metadata for data contracts or for XML serialization must be added, but the serialization requirements may vary across applications.

Clearly I need the metadata separated from the class definition. So how do I add metadata to my entities for each separate application?

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Access A Progressbar In Form From A Separate Class?

Oct 18, 2009

I need to be able to access a progressbar in my form from a separate class.

I tried

Dim Prog as Progressbar
Public Property Pg()


I need to be able to access a control from a separate thread and return to the thread again.

Edit: Its just an example I gave prog a value of the object from the form and the invoke required is put in a sub so thats not my problem.

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