wondering about the relatively efficiency of declaring oop variables in the loops, emselves, or declaring them before first use. Here are some examples:Declare early:
Dim ix As Integer
Dim currentNode As System.Xml.XmlNode
For ix = 1 To 100
[code].....
For i As Integer = 1 To 10
Dim j As Integer = 10
Next
now my question is, Is memory allocated to j every time its executed inside for loop? or only value of 10 is assigned on subsequent iterations?
I'm building SQL statements with a bunch of values from a dataset. Obviously that gives some really long names to put inline or even in parameter. addwithvalue code so beforehand I just declare a bunch of variables with really short names and assign them to the DS's exact fields like: [code] but this way I'm putting all the data in the dataset into memory twice by copying it into a new variable, right? So I was thinking, if it's just a string variable representing a field on the dataset, why not declare it by reference so the variable is basically a handy nickname pointing to that field in the dataset.Will it even work to have a string declared by reference and connected to one value inside of a dataset? And if so, will that stop duplicating everything in memory? I forgot how to declare a variable as a reference to another variable instead of the normal way in VB.
View 12 RepliesIn this
Dim [end] As Point = e.Location
what is the significance of the [] 's?
I have the following form[code]...
and when I run my app, I get a SQL error that tells me that I need to declare a value for '@payperiodstartdate' but I know that that value is declared because the first query runs fine. I am told that the line where the error is is line 59, which is this line [code]...
I'm working on a home project using DirectShow.Net. to learn some VB.net. Most of the examples I've found have all been in C# so I'm looking through code for ideas and converting where I need to. I keep stumbling upon these declarations and I'm unsure how to convert it to a VB.Net statement.[code]Then the second part seems to be assigning the value but as its made up of two parts im unsure how that works?
View 2 Replies[code].....
View 4 RepliesI have noticed in VB.Net that most Dim statements also include an assignment. Eg:Dim myvar As String = "Hello World"As this wasn't possible in VB6 I have always done the following:
Dim myvar As String
myvar = "Hello World"
im sure im mis-wording the concept but here it is anyways. I know in CSharp you can do
el.AppendChild(new UISize(file, "TSize") { CX = 95, CY = 20 });
which declares a temporary bucket variable and then assigns the associate property values to the variable. Which then sends it to the XMLElement AppendChild method. What is this design concept called? What is the conversion to VB.Net? I have tried using my own online utility that does a 90-95% conversion rate from C# <-> VB.Net. It has failed in this instance, and so need a hand-up on what i am looking to do to convert this from C# to VB.Net. I would really like to not have to do a long-declaration of a variable with assignments, if at all possible.
I'm making a call to my DLL file (prototyping 30+ functions), and want to be able to switch between different versions of the DLL quickly while in development. Thus, i want to replace the literal string constant that follows the "Lib" key word, with a variable string constant. In case there's any confusion in my use of the jargon. I am currently able to do this:
[Code]...
How could I create declaration(event) to a variable control in VB .net ? [code]please i need to know how to insert this (declaration) newweb_ DocumentCompleted it's similar to WebBrowser_DocumentCompleted but it's a variable
View 5 RepliesWhen 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 was looking at some existing code and stumbled across a variable declaration I didn't understand.
public foo as Boolean?
What does the question mark signify?
I've been programming for many years in many languages and I've seen the variable declarations conventions change. With VS 2010 I've noticed you don't have to declare the variable type. I work alone so I can use any method I want. But, someday I may want to sell some of my code so I would like to keep my programming conventions current.
In VS 2010 which of these would be considered the best convention?
Dim srtFirstName = "Bob"
Dim strFirstName As String = "Bob"
Dim FirstName = "Bob"
Dim FirstName As String = "Bob"
Why are static variables set equal to 0 in the declaration when 0 would be the default value of the numeric variable anyway when it's first declared? Not including the "=0" in the static declaration seems to work with no problem.
View 2 RepliesI got problem regarding declaration of dynamic runtime array declaration Here is my code
[Code]...
here is some simple code:
0: dim varA = 0
thread.sleep(1000)
GoTo 0
I was wondering how do I name each new variable a different name each time through the loop (i.e. varA1, varA2, varA3)
Im looking for help with trying to vary a variable-name in a for loop:
For b = 1 To Count
' the below image_var(b) varible needs to vary on each iteration'
Dim image_var(b) As New LinkedResource(Server.MapPath(myArray(b-1)))
' need also to have the b in myArray(b-1) bit work through the loop too'
' that is I''m after the array index b minus 1'
image_var(b).ContentId = "imageContentId_" + b.ToString
[Code]...
What type can i assign a for loop control variable? I want the for loop to be the output file of a calculation, but i can not define it as anything, and i do not know how to write it so that the output is actually what the code spits out once the code has finished running.
[Code]...
this is my code -
for i as integer = 0 to rows.count - 1
output &= "Name =" & row(i)("Name")
output &= "lastName =" & row(i)("lastName")
[Code]....
is there a way to make a for loop and run applicant 1,2,3,4.... in one shot?
I'm working in VB.net and I want to create a generic ToString. is there a way to do a "For Each" in "Me".
[Code]...
i have a program that is going to be disabling services depending on what is selected by the user via check boxes, and it would also add to the log if it failed or succeed ( the dim xfailed as integer ). There are a total of 73 options for services and i didn't feel like copy and pasting IF THEN statements for all 73. I was wondering if i could make a loop out of this?
The x would be the service name - ex. "Themes"
Dim x as serviceprocess.servicecontroller = new serviceprocess.servicecontroller(x)
dim xFailed as integer
Try
[code]....
I've started using .Net's stack collection. The basic features I guess are the "pop" and "push", where you add or take off the top element of the stack (if you are referencing other elements in the stack then another collection type is probably better).[URL]..it appears that the Stack collection (like other collections) is basically an array with some window dressing (so you actually can see other elements). As far as I can tell, "popping" and "pushing" is changing the first element of the array. Shouldn't instead the final element be the "top" of the stack and be the one that is changed? Otherwise the program has to reindex all the other elements in the array every time a pop or push is made. This seems very inefficient. But this is what Microsoft's description appears to be saying what is happening.
View 10 RepliesFor example, when the codes are compiled, will VB.NET tend to be slower than C#? Or are there any major features in VB.NET / C# that we cannot find in the other language?
View 1 RepliesSo i am working on a program that needs to run NSLookup for a Computer name specified by the user. Here is the code I have developed which works:[code]Now because of the dynamic domains that this will be on, it is difficult to nail down which character to start a read at to determine if the Computer name exists. For some reason the reader is not picking up the '***Non-existent' line that is reported from NSLookup. When i run the NSLookup it requires me to run the Function 2x before it displays a result in my lblresults. With that pre-knowledge,
1. How do i make the NSLookup Process more efficient?
2. Is there a better way to Parse the information to specificly pull the lines that have been reported back, specificly the '***Non-existent' line.
The subject almost sums this up. I have dimensioned a variable 'y' inside a for loop. If i then try and access this outside of the for loop I cannot. What is the reason for this and how can I correct it? Unfortunately I am not able to Dim the variable 'y' outside of the for loop.
View 1 RepliesI have a mvc 3 vb.net app that I need to generate several viewbags for... I tried the following code to just drop a variable at the end of the viewbag name after each loop but it wont take it.. It says "Object variable or With block variable not set." when it his the viewbag.status(p) line on the second pass it makes through the loop...
Dim p As Integer = 0
For Each registrant In b
Dim _regi As attendance = registrant
[code]....
Is it possible to define two variables in a vb2005 For loop in a similar way that jscript does it?
the javascript example is
for(i=0,l=0;i<20;i++){}
Using VB.NET .NetFramwork 3.5. This fails and strikes me as odd. Is this correct behavior:
Public Sub TestForEach()
For index As Integer = 1 To 10
Dim z As Integer
Assert.AreEqual(0, z)
z = index
Next
End Sub
I would expect z to always equal 0 as I thought the dim-ing of an integer would set the value to 0. If you run this. It fails at the second loop. For some reason z retains it's value of 1. I know I can manually initialize z to = 0, but I wanted to know if this is a bug or expected behavior.
I have a button that searches through a binary file to bring up customer information with the following code:
[Code]...
My problem is, I need to create a variable which holds the record number, so that the record can be edited, and put back into the file at its previous location, how would I implement this? Not sure about the code.
