im using many variables in my project however, they are most of the time used for 1 or 2 things, so having them loaded up like that forever sounds not very good for performance.Is there a way i can remove a variable after i no longer need it?
for example:
private sub button1_click() handles button1.click
dim result as integer = var2 + var1 / 2
[code]....
I am able to draw points on a picture box. Add Labels to the points i draw. And delete the Labels at runtime.
It is the last part im having an issue with. Apparrently when i press the button to delete all the labels it does that because i can then start creating the labels again in the picture box starting at 0 again. But it leaves all the old labels visible on the screen. I assume i need to delete the Points to but this is beyond my current knowledge set.[code]...
Adding it there but if i load i it loads it all
View 8 RepliesHow Do you delete xml information if you can add it to at runtime then prehaps you can also change it a run time.
View 1 RepliesVS 2008 [RESOLVED] Delete stuff at runtime
View 1 RepliesI have a block of code below that allows the user to create new buttons at runtime at the click of the right button at runtime.But i am wondering how to detect the selected button on the main form and then the user can delete the selected button at runtime.
The other thing the user can do is also to drag the button around the win form when in runtime. Cause i'm new in VB and i am exploring this part. the code that i have is here and it is created by one of the member in msdn.
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I'm trying to populate some file dependant settings from the database. Values I can add no problem but how to set the names as they differ from datafile to datafile?
For Each myRow In SetModDataTbl.Rows
Dim SettingName As String = myRow.Item(1)
Dim SettingValue As String = myRow.Item(2)
'>> SettingName = SettingValue <<
Next myRow
How I can delete value variable using vb.net.. I try this one..
strTBL_T5_Lookup = "" or
strTBL_T5_Lookup = nothing
But value is still in there.
In Visual Studio 2010 is it possible to check the state of variables during run time. When a run time error occurs the error is highlighted and you are able to mouse over different variables to see their values when the error happened. I would like to do something similar except without the error.
View 7 RepliesI am trying to create a number of objects depending on the width of a row of an array, is there a way I can change the name of the variable being Dim 'd as I don't know how wide the array will be.
I have been trying something along the lines of:
pseudocode
For x as integer = 0 to UBound(MyArray,2)
Dim Object & CStr(x) As Object Type
Next
global variable can be created during runtime?
View 1 RepliesI'm multiplying X*Y*Z in a loop of 200 interations Y is declared as a constant. A timer can cause the loop to pause for 10 seconds.
During this 10 sexond pause I would like to change the value of Y. It needs to be changed only for this run, not a permanent change which can be done in the declaration.
I have a third party dll. I wish to create a variable to reference to one of the variable in it.so that the value in the class change, my value also change. The senario can be reproduce from the code below.For the code below i wish to get the form to display 2 instead of 1. How can i make my variable test2 always referencing test.testValue?
View 11 RepliesI have a list with several fields that is created from dataset from a linqtosql query. At run-time, the user gets to specify what field he/she wants to display from the list. In other languages, I can dynamically do this like:
valueIwant=mylist(i).[fieldnameImInterestedIn]
Where 'fieldnameImInterstedIn is itself a variable. How do I do this in VB.Net?
non-working actual code follows:
Dim patientdata = (From patientvar In pdfdatacontext.tbPatients Where patientvar.PatientID = patientid)
Dim patientlist = patientdata.ToList()
fieldvalue=patientlist(0).(reportrow.userselectedfieldname)
When I scroll down to the function shown below, and right click Analogues - go to definition it takes me to the top of the file, and lands on top of the
[Code]...
I'm writing a simple program to "change" a login. I need to know how to create a variable that lasts past when the program is closed (so the changed login stays and is not reset). Here is my code:
[Code]...
Is there any way to access your variable names at runtime? Is there any kind of collection you can loop through?
View 2 RepliesI am trying to create new variables inside a class after creating its object at runtime. The problem is that I don't know the variable names or the value beforehand so I have to create the new variables at runtime.
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This is a more elaborate explanation of my code. If you observe that in the Eval function I have tried to evaluate Fval(abc). Now the object array abc is not declared in the Test class because it existence is not known beforehand. What I want to do is create an object array abc of length 2 and populate it with some values and when Fval(abc) is called then then the value of index 1 should be the return value of Eval fucntion.
I've got some code that looks like this:
If ediFileGroupAbbr = "NIPDSINV" OrElse ediFileGroupAbbr = "WWPDSINV" Then
Dim p As New PrivateBillingAdapter_ForN(ediFileGroupAbbr, businessLocationID, mode, EDIJobItemLogID, BusinessUnitID)
Return p.ProcessEDI(True, False)
ElseIf ediFileGroupAbbr = "FOPDSINV" Then
[code]...
to which I'm passing in a value of ediFileGroupAbbr = "FOPDSINV". But the code is executing as if it's dropping into the third condition (p is a PrivateBillingAdapter). So I've stepped into the code and, sure enough, it drops into the second condition. BUT, if I step into the execution of the constructor, the debugger jumps to an odd place in the code - sort of the middle of a method and not on any actual line of code.A couple clicks and it hops back out of the constructor, still in the second block of code. But if I mouse over the variable p to see it's type, boom, its a PrivateBillingAdapter (from the third block).Like I said, something is clearly wrong but I don't know what. I've tried rebuilding several times but with no new results.This is VS2003, framework 1.1 with VB.NET.
What i am tring to do is execute certain code based on a variable held in a module someting like compiler directives, here's an example for lack of an explanation.[code]...
View 2 Repliessir, i have no idea how the code will look, but i want it to assign a value after reading from a text file and then store it for further use even if the text file is not there, but without using any external storage like registry, disk, ram. It should store the value in itself and do like this:-
dim variable1, variable2 as string
if file.exists("text.txt")
read the text
[code].....
I'm trying to retrieve a record from access database on the basis of a string variable.
here is the code
Dim val As String( "kent")
Dim comm As Data.OleDb.OleDbCommand
comm = New Data.OleDb.OleDbCommand("select DISTINCT M_DATE_P from MACHINE_P where M_MODEL=" & val, conn)
i want to pass val variable, so that i can retrieve data at runtime.
Variable 'loNode' is used before it has been assigned a value. A null reference exception could result at runtime.
why I am getting this error?
Imports System.Xml
Module Module1
Sub Main()
Dim doc As New XmlDocument
[code].....
I have created a picBox inside a function, this function then adds some properties to it and then adds to: Me.Controls.Add(thisarray(count))
View 1 RepliesHow can be find out which file is going to delete when, user provides command like DELETE or SHIFT + DELETE or by programmatically gives DELETE command. Well I know about FileSystemWatcher Class, but this class doesn't provide information before delete...
View 1 RepliesBelow is my entire code for trying to add some boolean values to a list box that are queried from a datatable called "Availability" and the value booRV which is my OleDbDatReader is "Nothing" at runtime. The error is: No value given for one or more required parameters. I assume this is all the items that are being queried, but i am not sure. Here is the code:
[code]...
When 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 have created multiple dropdown list at runtime and populated with data. I also have added an eventhandler to determine the selected value of the drop down list.
The code is as follows :
Dim tbl As New Table()
tbl.EnableViewState = "true"
[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.
I have a Visual Basic 2005 program which runs fine if I execute the built Executable. However if I start the application in VS2005 debugger it gives a weird error
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