I'm trying to create an array to be handled during my code. I want to create it as soon as I open the program so I've placed it in my bit of constructor code. This code was working fine before I tried to initialize a new array in there but when I place that in I get the above error message. This occurs whether I put the new array bit of code first in my constructor class or not.
View 5 Replieswhat's the rationale behind this limitation: Constructor call is valid only as the first statement in an instance constructor i want to pass an argument to my constructor which validates this argument and calls mybase.new according to this argument but it doesn't let me
example:
Public Class prob
Inherits System.ApplicationException
Public Sub New(ByVal problem As String, ByRef inner_exception As Exception)
[code]....
I am having problem with the coding of this (endless loop) and formatting of summary boxes before tests are complete that should not happen. (the overall goals is to have a separate validation procedure that does not calculate or dat displays are not performed until after call function is complete and valid. The validation that takes place are that two boxes are filled in - one is text and the other is a numeric value. (using vb 2008)
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I have a defualt constructor that has a object of a Database connectivity class:[code]therefore in theory i have to call the defualt constructor of Question from overloaded constructor. [code]How every in realitty is it possible to call the defautl constructor from the overloaded constructor
View 5 RepliesI have a class inside a class.I need to expose the properties of the 2nd class to other classes, therefore it is public.However, I do not wish other classes to be able to create instances of this 2nd class, it should only be instantitated from its parent class.I thought I could resolve this issue by making the constructor of the 2nd class private, but this even prevents the parent class from instantiating its child class! How can I work around this, do I have to make the constructor public and allow anybody to create an instance of the class?
View 3 RepliesI am stuck with a problem about generic classes. I am confused how I call the constructor with parameters. [Code] I get error in the starred area of the DBLayer Object. What might be the possible reason? what can I do to fix it? I even want to add New(byval someval as datatype) in IDBObject interface for overloading construction. but it also gives an error? how can i do it? [Code]
View 4 RepliesAfter debugging a particularly tricky issue in VB.NET involving the order in which instance variables are initialized, I discovered that there is a breaking discrepancy between the behavior that I expected from C# and the actual behavior in VB.NET.Nota bene: This question concerns a slight discrepancy in the behaviors of VB.NET and C#. If you're a language bigot that is unable to provide an answer other than "that's why you should use C#, noob", there is nothing for you to see here; kindly move along.Specifically, I expected the behavior outlined by the C# Language Specification (emphasis added):
When an instance constructor has no constructor initializer, or it has a constructor initializer of the form base(...), that constructor implicitly performs the initializations specified by the variable-initializers of the instance fields declared in its class. This corresponds to a sequence of assignments that are executed immediately upon entry to the constructor and before the implicit invocation of the direct base class constructor. The variable initializers are executed in the textual order in which they appear in the class declaration.
Contrast that with the portion of the VB.NET Language Specification concerning Instance Constructors, which says (emphasis added): When a constructor's first statement is of the form MyBase.New(...), the constructor implicitly performs the initializations specified by the variable initializers of the instance variables declared in the type. This corresponds to a sequence of assignments that are executed immediately after invoking the direct base type constructor. Such ordering ensures that all base instance variables are initialized by their variable initializers before any statements that have access to the instance are executed.
The discrepancy here is immediately obvious. C# initializes class-level variables before calling the base constructor. VB.NET does exactly the reverse, apparently preferring to call the base constructor before setting the values of instance fields.If you want to see some code, this related question provides a more concrete example of the divergent behavior. Unfortunately, it does not provide any hints as to how one might coerce VB.NET into following the model established by C#.
I'm less interested in why the designers of the two languages chose such divergent approaches than I am in possible workarounds for the problem. Ultimately, my question is as follows: Is there any way that I can write or structure my code in VB.NET to force instance variables to be initialized before the base type's constructor is called, as is the standard behavior in C#?
I am suppose to call a method and define it from the constructor of a form.
MSDN says this in regards to something im doing.
Whatever, does it mean?
I have recently found out that no argument constructor and multiple argument constructor cannnot call each other in turns. What is the underlying reason of this limitation? Some might say that constructors are where resources are initialised. So they must not be called recursively. I want to know if this is the only reason or not. Functions/methods/procedures can be called recursively.
View 5 RepliesI'm getting "Me' is valid only within an instance method" error when I convert function to a PageMethods. [code] If I remove Me, I get different error.I got this shopping cart script somewhere online and I'm not sure what to replace "Me.objDR" with something else.
View 3 RepliesI'm trying to make my own password generator from a tutorial on the internet. But after following everything exactly as i should. It gives me some annoying namespace errors when i try to proudly build the solution.I fighted with Visual Studio 2010 for 30 munites, but it wont get fixed.
View 3 RepliesQuestion, I am new to Vb taking a class now. I have written a code for a project and I am getting the error "Statement is not valid in a namespace". I have no other errors.
Attached File(s)
I keep getting that error and I'm not sure how to fix it, I tried switching to several different things like timer1.tick to just timer1 and private sub to public sub and such.
View 5 RepliesWhen i try to compile this code i get a "Statement is not valid in namespace".apparently its the only error in the script what does that mean? how can i fix it?
What the script does is closes a program and attaches a file to an email then sends it out. im trying to get this done for a project.
im using visual basic express 2010 to compile it. which im new with.[code]...
I am using if statements, to call to routines that rely on the return values from a previous query, but i have a sneaking suspision as my code isn't doing what i want it to that the info isn't getting through the right bits: here is the code with comments to say what each part is:
While RetVal2.Read
If RetVal2(0).ToString.Length = 1 Then
SectNode = New TreeNode("0" & RetVal2(0).ToString & " - " & RetVal2(1).ToString, 2, 2)[code].....
I don't think it is doing it right, would i need a For and Next statement?
I have errors saying "statement not valid in a namespace" What is a namespace? They are variables that i want to set up so that each can only take a certain typr of data. Here are a few examples:
Public
pepPath As String
Public
[code]....
I am getting multiple "statement is not valid in a namespace" errors in my code and im not sure why. Heres the code with the errors:
Option Explicit On
'Time at http:msdn.microsoft.com/en-us/library/ms724962(v=VS.85).aspx
' Retrieves the number of milliseconds that have elapsed since the system was started, up to 49.7 days ((2^32)/1000/60/60/24)
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Why I am getting the following error?
"Statement is not valid in a namespace"
With the following
Public Function EstablishConnection2() As Boolean
I have an abstract class which requires a delegate to function. I pass the delegate into the constructor. Now that I have a non default constructor I need to call the abstract class's constructors from the concrete class which means that I need to use MyBase.New(...). I have included a quick example below.
Public MustInherit Class BaseClass
Public Delegate Sub WorkMethod()
Private _Work As WorkMethod
[code]....
I have tried to do this but I keep getting the following error: "Implicit reference to object under construction is not valid when calling another constructor".Can I not do what I am trying to do above? I initially had the delegate setup in its own setter method. But then I am creating a deceptive API because it does require a point to a method to work properly.
I have so many form in different module in one solution. I already instantiate a new Form as a global variables in my parent form. Then, call the code
frm.show()
in my button1 event
I have program requirement, I need to call an existing form to an MDI form by using a new form button and when I click it of course it will show my existing form, but I want is to create a new instance of the existing form, which make the the other forms different from one another inheriting the controls of the form I called. What I mean is I can create many child forms inheriting the controls of the existing form I called.
Dim newform as new System.windows.form
'this the function will call when on click the new form
Public Function newform()
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I Have a bit of a problem..For some reason visual studio says there's an error--it reads:Statement is not valid in a namespace..I can't figure out how to fix it. This is what my coded looks like and there's a blue squiggly line on the first two lines that start with Private Sub:Private Sub btnPlay_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnPlay.Click.[code]
View 2 RepliesI have a class called PunchEvent. In the class I have an Enum called EventReason. I want to have a function Public Function ReasonToString(ByVal Reason As EventReason) As String. That is defined "near" the class (ie in the same file?) but is not actually part of the class (ie. it is not a member function). In c++ I guess this would be a static function? I tried to just define it after the "end class", but it says "statement is not in a valid namespace". Any recommendations?
View 5 RepliesI have a strange problem with creating an instance of a form which I want to use as a custom message box.
The idea is that when the user clicks the button to perform a database search, an instance of this form is loaded. The background image of the form never displays but the text on the form does - but it all works fine when I remove the call to the database.
I also tried putting a "proper" VB message box just before the database call and when I block it this way it seems to allow the image to draw on the form.I also tried using a timer delay before the database call - just a couple of seconds to see if that would allow it time to draw the image.
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I am a excel vba developer, and all public functions i would put in the module. I assumed by creating a .vb rather then a module i can put all functions i use regulary throughout forms in this.however i get the error on this code
Function CopyFile(ByVal x As Integer) As String
Dim FileToCopy As String
Dim NewCopy As String
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I have a VB.NET singleton class which implements Serializable:
Imports System.IO
Imports System.Runtime.Serialization
<Serializable()> Public Class CoordinateHistory[code].....
My problem is that I can't actually call .Serialize() on the instance of this class, like all of the examples online show. What am I doing wrong?
I am trying to make a counter go up by 1 every time a subroutine is called But i dont know how to word it. Here is the code. [code]...
View 2 RepliesI have a form which obtains data from text boxes and stores them in a file. If fields are missing, an error message is displayed. When information is stored, a message box asks if the user wants to enter another customer. However, that message appears whether or not information has been stored - I've used the following code. [code] Is there a way to not call the procedure if the error appears?
View 2 Repliesi have a problem i use a call sub procedure to do a delete records in my database for my vb .. now i have a problem when i call my sub delete proceudre in like this call GetDelete("tblName") , but in the sql query the sysem declare like this delete * from 'tblName' in my sub procedure when i set the breakpoint in which cause an exception error "Syntax error in query. incomplete query clause " anyway how to delete the quotes so i can retreive it without error
View 2 Repliesi have the following CallSets defined for serveral views including a combo box. If a user chose INDIVIDUAL, UNITEMIZED or CANDIDATE from the cbo box I wanted the view "AddIndividual" to be called. However, if anyother entity was chosen than it would call the view "AddOrganization." The "View", "Edit", and "Add" calls work but not the "AddIndividual" or "AddOrganization"
Private Sub cboContribType_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cboContribType.SelectedIndexChanged
Dim contrib As String
contrib = cboContribType.Text
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