I have this code
Text1.Text = Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData)
but, when I run it, it produces an error: Compile Error: Variable not defined and it points to the second "Environment" string, the one inside the parenthesis. Is there a reference that I should be enabling?
Today I investigated a logical bug in our software and figured out that this is related to the way VB.NET thread variables inside a loop.Let's say I have the following code:
Dim numbers As New List(Of Integer) From {1, 2, 3, 4, 5}
For Each number As Integer In numbers
Dim isEven As Boolean
[code]....
The problem is that isEven is declared but not assigned.In this specific case, it would be correct to write dim isEven as Boolean = false but I haven't done this.In VB.NET, a variable that is declared inside a for loop keeps its value for the next itaration. This is by design: [URL]but this is also dangerous pitfall for programmers.
However, until now, I haven't been aware of this problem/behaviour. Until now.Most of our code base is C# anyway, which doesn't allow the use of an uninitialized variable, so there is no problem. But we have some legacy code that is written in VB.NET that we have to support. So the best thing would be to generate a warning or even an error in this specific case.But even with Option Explicit / Option Strict this does not generate a warning / an error.Is there a way make this a compile time error or maybe a way to check this with FxCop?
I am writing some simple utility applications in VB.NET. I am using Visual Studio 2010 Express.I'm trying to throw a FileFormatException exception in my code if a user specifies a file that has the wrong extension. Documentation indicates that this exception has been around since .NET 3.0. See
[URL]
However, Visual Studio gives me an error saying that System.IO.FileFormatException is not defined. It's not a typo, either. FileFormatException appears in the object browser in System.IO, but doesn't appear in the Intellisense drop down when I type System.IO.File.
Here is my simple function:
Function ValidateDBFile(ByVal DbFilePath As String) As Boolean
ValidateDBFile = False
If IO.File.Exists(DbFilePath) Then
Dim flInfo As New IO.FileInfo(DbFilePath)
[code]....
I am getting the error:"Range variable 'sender' hides a variable in an enclosing block or a range variable previously defined in the query expression."for this
Imports System.Data.SqlClient
Imports System.Linq
Public Class Form1
[code]....
I can select any other item from the table without the error. "sender" has the same properties as "receiver" in the SQL table.
To search a pattern containing parenthesis, they must be escaped using backslashes. So to search for (Streetname) you must use (Streetname). If you don't use , whatever is between () will be retained and available for reference through the variables $1, $2 etc... Exemple, in the sentence "It's worth noting that (StreetName) can be anything...(Post), (TreeStump)", $1=StreetName, $2=Post, $3=TreeStump
[Code]....
My coding, I got error: Error Handles clause requires a WithEvents variable defined in the containing type or one of its base types.
For information i am using visual studio 2005. Here i highlight my probleam with in my coding
Public Class Admin
Private Sub TextBox6_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
End Sub
[CODE]...
If I want to do a if-statement, wich one is the most correct way?[code]Of course, both will work but to me, the second way looks more correct. I feel that it's much easier to understand what's actually going on, especially if there are several expressions to be evaluated. But my guess is that there is no difference in preformance, or am I wrong?
View 4 Replies[code]In the above code as the file path is mentioned it can be declared as an environmental variable as %TEMP%Abc.exe.Because in code the path is called hardcoded path means we are giving the path to look for the exe in that folder but it should not happen,Because in each and every machine %TEMP% value varies.So I just want to know how to use that environment variable and call Abc.exe like [code]By googling I got to know the function we have to use is GetEnvironmentVariable() .
View 2 RepliesIn a SQL UPDATE statement, how to i "set" a field to empty? (because it was occupied before). i get a syntax error (missing operator) that points to my sql string this is the update command i am using but its not working.
[Code]...
Solution at the bottom. I receive the following error when trying to update records: Must declare Scalar Variable @PaymentTermID Problem is, @PaymentTermID should be defined already in the Update parameters. The 2 functions for onrowdatabound and onrowupdate are tweaked versions of the ones found here for the DropDownList: GridViewRow.DataItem Property. Delete works fine. No new lines are added, just names changed around. I am not exactly used to working with asp objects.
[Code]...
I have a Linq-to-SQL class diagram in my web application containing the two tables in my database (held in a DBPro database project in the same solution). All was working fine yesterday. I start doing some work tonight and note that the solution compiles fine in Visual Studio, but when I run the web app I get a compilation error:
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.
Compiler Error Message: BC30002: Type 'FrostAlertDatabaseDataContext' is not defined.
[code]....
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Click, Open.Click,Name.Click
SelectVid.ShowDialog()
End Sub
[code]....
I keep getting this error:
Error1'.' expected.
Error2Handles clause requires a WithEvents variable defined in the containing type or one of its base types.
Error 2 is also error 3
I am auto generating data grid and I am using check box in Data grid View,Now i am invoking check box state changed event but it produces the following error Handles clause requires a With Events variable defined in the containing type or one of its base types.
Here the code
Private Sub PRNT_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles PRNT.CheckedChanged
Some Stuff.
End Sub
I am in the processing of moving an app from VB to C# but some of the classes I will just be moving to VB dlls to access from the main C# app. In doing this I am trying to get the VB dlls to utilize the main C# class lib. In this C# lib I have an abstract clase called base process, it sets up a background worker and handles all the progress tracking, errors, and even reports an ETA. To use this in a derived class in C# you would just do this...
public class SomeLongProcess : Common.Multithreading.BaseProcess
{
public void start()
[code]....
The problem is that if I do the equivelant in VB I get an error "Handles clause requires a WithEvents variable defined in the containing type of one of its base types". Well I can't do a WithEvents in the base class because it is C# so..
I need to use quotes inside a string variable... but I don't know how.If I simply put double quotes at the start and at the end, the program interprets it as a closed interval, like if every quote is a string.
What can I do? I've searched here, but none of the results seems to be related with VB.net.
In Access, it is easy to call a user defined function in a sql statment, exampleSub AAdim mDb as[code]...
View 5 Repliesi am getting errors on last two event handlers. what did i do wrong?
Error - Handles clause requires a WithEvents variable defined in the containing type or one of its base types.D:Shipping ApplicationShipping ApplicationForm1.vb75136Shipping Application
Error - 'PrintDocument1' is not declared. It may be inaccessible due to its protection level.D:Shipping ApplicationShipping ApplicationForm1.vb1119Shipping Application
[code]....
I'm trying to make a string use parenthesis ( "(" and ")" ), but for each one it returns: null (for the parenthesis).How can I get this to work? These are examples of codes I've tried so far:[code]....
And then I tried reading from text files that had those characters. Each one only returned a space.How can I get this to work?
Just upgraded a VS 2005 ASP.NET 2.0 website to VS 2008 ASP.NET 3.5. There was an error on the Sub Button_Click. It seemed to be a minor error, the website and the button worked just fine, as usual. What does the error mean?
Protected Sub btnDEreports_Click(ByVal
sender As
[code]...
Error 20 Handles clause requires a WithEvents variable defined in the containing type or one of its base types.
How can i get the string within a parenthesis with a custom function? e.x. the string "GREECE (+30)" should return "+30" only
View 5 RepliesWhy isnt this working?Sub Macro1()
[Code]...
i am downloading data from xml using linq library those data i want to add them on a textblock item
TextBlock1.Text = TextBlock1.Text & result
but it has an error :
Error 1 Operator '&' is not defined for types 'String' and 'System.Xml.Linq.XElement'.
When i am changing this line to :
TextBlock1.Text = TextBlock1.Text & result.Tostring
it works but it adds this data :
"<"data> data <"/data>
instead of :
hello
I'm making a game for a school project We've created a character that moves around the screen and creates blocks behind him as he moves around.We want to make it so that when the character moves from one edge of the screen to another, it fills the screen. So in order to do this we have a Points array that stores every point the character touches on his way to a wall.We then fill the Points array with "formsurface.fillPolygon(Points)"Now I'm wondering is there anyway we can retrieve all the points that are WITHIN or INSIDE the Points array we made? ( remember the points array simply contains the outline or the path the character created, we're filling inside that outline)
View 1 RepliesWhen I attempt to run a program I just finished coding I get the following message: "Error 1 Handles clause requires a WithEvents variable defined in the containing type or one of its base types." Looked it up online and still does not make sense to me. If I need to paste code or anything else let me know and I will do so ASAP.
View 8 RepliesI am having a problem in the following codes
Problem in "'" & rawData & "'")"
Error Message Operator '&' is not defined for types 'String' and '1-dimensional array of Byte'.
Complete Coding:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim fileSize As Integer
Dim rawData() As Byte
[code]....
with this code dont know wht its not working source = wc.DownloadString(String.Format("http://" & cboHSearch & "/cse?cx=013269018370076798483:gg7jrrhpsy4&cof=FORID:1&q=" + cboEngine.Text + "&sa=Search", Me.cboEngine.Text.Replace(" "c, "+"c), resultCounter))
View 5 RepliesI've made a simple program that set environment variables like [code]...
If I close de command prompt then open it again, it's OK.
How can I refresh the environment variables in the command prompt I use my program?
I am wondering if I can use VB.NET(I am using visual studio 2010 express) to get and set a environment variable.
I want to add path of my application on system environment. I want to preserve what is already there and then I wan to add my string. This can be done by getting value of PATH and then append my string then re writing it.
I have 2 questions here:
How to get/set system variable in vb.net 2010? Will it be on the fly, I mean will it be immediatly avaialble in dos prompt or there will be delay?
As just for experiment i opened a command prompt then updated the PATH variable manually and it was not updated. I am wondering it I do it through programe it will be same.
I was trying to use the sentence
Environment.SetEnvironmentVariable("CLIENTIP", <value>)
but the variable is not created. I used both an string variable and a constant to set the value.
So, how can I do this to work?
I am getting a registry key by using the method:
[Code]...