In VB.NET, what is the difference between
if foo is Nothing Then
doStuff()
End If
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foo is Nothing evaluates to false and foo = Nothing evaluates to true.
However, if bar is declared as an Object and not initialized, then foo is Nothing and foo = Nothing both evaluate to true! I think this is because Integer is a value type and Object is a reference type.
Is there any differnce between the following syntax? Im thinking that there isnt, as long as the end result of the "AS" portion has RuleType named "AS R.RuleType." Notice that the first snippet of code has the R.RuleType and the second has just Rule.Type.strRule.Append(
"select R.Ruleid,R.RuleNumber,isnull(C.ClientName,'') as ClientName,R.Customerid,Case R.RuleType when 'R' then 'P' when 'B' then 'G' else R.RuleType End as R.RuleType,isnull(C.InternalClientID,'')
as InternalClientID,")
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If not, maybe someone could write such an article and the view count would go through the roof?
View 1 RepliesI am having an issue trying to figure this out. I am writing a script editor that uses tabs (a tab control) and I want to implement syntax highlighting. My issue is that every sample I can find on syntax highlighting uses
Private Sub RichTextBox_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RichTextBox1.TextChanged
Can any one translate the following syntax to vb.net.
m_TextBox.Loaded += TextBoxLoaded
m_TextBox.Loaded -= TextBoxLoaded;
private void TextBoxLoaded(object sender, RoutedEventArgs e)[code].....
i have this code:Private Sub frmMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
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Error 1: Option Strict On disallows late binding.Im using visual basic 2010 express on a gateway laptop thats running Windows 7 OS How do i resolve this error?
I have a listbox and it it I am showing numbers.It should look like this (line by line) 1,2,3,4,5,6,7,8,9,10,11.....but is is showing it like this 1,10,11,...2,20,21...3,30...ow can I make it that it will show it in number order 1,2,3,4,5......
View 5 RepliesI want to select some rows from a sql express 2005 table. I am using this expression: "Starttime >= " & dtpStart.Value dtpStart is a DateTimePicker But I am getting this error: Syntax error: Missing operand after '14' operator.
View 18 RepliesI'm sure this is straightforward but I cannot find the correct string to get a google result. In VB.NET what is the difference between = (equals sign) and := (colon followed by equals sign)?
View 3 Repliescan anyone tell me book for VB.net for beginner and complee package of books important for VB. as i don't know anything abt VB.
what is difference between VB.net and asp.net and c#??
Possible Duplicate: What are the most important functional differences between C# and VB.NET? What are the basic difference between c# and VB.net?
View 3 Repliesknow the difference between C#.Net and VB.Net. I use C#.Net for my projects, but when ever I met with some other programmers they often called VB.Net more powerful and easy, than C#.Net. I always asked them "Why it is more powerful then C#, since it uses the same framework?" but still I didn't get any answers.
View 3 Replieswhat exactly distinguishes a COM component from a DLL? Isn't a COM component just a library of functions that can be called from another application? Why is using a COM component so much more complicated than just registering it like one would do with a DLL?
View 4 RepliesI'm looking for an explanation of the difference between
Dim sw1 = New StringWriter()
Dim sw2 As New StringWriter()
Both seem to instantiate new string writer instances that I can use.
I was under the assumption that VB's For Each loop was the same as a For Next loop. But when i try running the following code I do not get the expected result.
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I have this code, first I thougt it should be the same but i cant acces the info in the same way .. why is this???
Dim tp(,) As Integer = {{1, 3, 5, 9, 7}, {34, 3, 4, 5, 6}}
Dim tpo(1)() As Integer
tpo(0) = New Integer() {1, 3, 5, 9, 7}
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The first one I use only one for each and the other one I use two .. why is this different? are noy they 2 dimensional arrays ???
What is the difference between VB and VB.NET?
explanation with examples preferred
The next code works fine in C#:
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But this code crash with a OverflowException in VB.Net.
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Both codes seems the same to me. What is the difference and how can I get the C# code converted to VB.Net?
For those who have experience, working with VB.NET, it's easier to use SlimDX or SDL? The tutorials for SlimDX are already written for .NET, but I've read that SDL it's a lot easier than DirectX itself.in my case, I just need 2D graphics.
View 4 RepliesI have two arraylists, and I would like to have a new arraylist with only the uncommon items. Is this the "best" or at least decent way to do it?
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What is the major difference between 'for each' and 'for' loops in .NET? Is there any performance gain while comparing these two? Which one gives a better performance/faster/memory management?
I have in the past used .net executables as libraries. I'd just add them to the references in visual studio and I was ready to go. Today I tried the same to a new exe (actually mine) and it doesn't seem to work. When I add it to Visual Studio and try to watch its members on the Object Browser, it doesn't show up anything inside that executable's assembly.
I know the main difference between an exe and dll is that the first has an entry point while the 2nd doesn't. Are there any more differences? I know that unmanaged dll's also have a DLL entry point, do .net have one too?Also, what might be the reasons that could make my standard exe/dll (with this i mean, not obfuscated or anything extreme like that) not show up anything in the Object Browser?
What's the difference between / and for division in vb.net? My code gives very different answers depending on which I use. I've seen both before, but never knew the difference.
View 3 RepliesI am trying to find the difference between two dates. The first of the two dates can be changed and when it is changed, the difference between the original dates has to be retained. This means that I have to automatically change the second date to have the same difference in days as it did before, but with a new first date. [code]I have the value of the old date1(currDate) and the new date1 value(newDate). I need to get the difference between these, and then add or minus these days from the endDate.
View 1 RepliesI'm making a form with an overview of orders from our clients. I have inserted 2 datetimepickers so the users can choose a period.
To know how many cols I need in my grid, I need to know how many months there are between the 2 datetimepickers. But that seems to be the problem. How do I get the number of months starting from one datetimepicker untill another.
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Here I am Clear the object using Dispose( Mycmd.Dispose()). Can I Use here Nothing ( Mycmd = Nothing?. Which is the Best ?
I am a VB programmer working my way into C#. I learned how to create and raise events in vb and am finding that it isnt done the same way in C#. Has anybody come across an article that will help me to understand how to do events in C# and maybe explain why it is different in VB.
View 5 Repliesfor determining whether a string of data contains certain text, which is more efficient? I have read elsewhere that there is somewhat of a consensus to avoid legacy functions, since they may or may not be available in future versions.However, trying to use the contains method (or indexof equivalent of Instr) is causing me problems, I think, because I am having trouble performing a case-insensitive search.
I am trying to be efficient and functional in my code. I am reading an INI file, and I have preloaded the contents of the file into a String variable, for 2 reasons. 1) If I can test if a certain section exists in the code, I can avoid attempting to read a section of empty data (the INI reader class I have chosen returns the value or an empty string for a given request). More importantly, 2) I have created a data field that is not INI compliant (at least not to the API?) as it is a data field that can contain an arbitrary (unlimited?) amount of data which is a hex-encoded representation of serialized byte data. I need to be able to determine if this value exists in the file and retrieve it using normal string manipulation, since the INI handler will not pass strings longer than 256Chr.
So, the problem I am having is getting "strFileContents.Contains("data=")" to return true in the case where the file contains "Data=". This could be data=, DATA=, DaTa=, etc.Instr has the option "CompareMethod.Text" which, I believe, does a case insensitive text search. What is the equivalent for "Contains"?
In C#, if you do this, it will compile:
namespace Name
{
public class Test
{
[code]....
I get (depending on the way I try to use "Test") either "'Name' is not a member of '<Default>'." or "Type 'Name.Test' is not defined." in my error list. I've found two ways to make it work, but neither are reasonable to expect of a user. One is to remove the "Root Namespace" from the project properties. The other is to include that namespace between "Global" and "Name".
I have made a custom tool that uses CodeDom to generate code for both C# and VB.NET. This is the reason why neither of the two fixes above are feasible: I can't expect my users to have an empty root namespace, and I'd hate to have to do VB-specific tricks in my code generation (kind of defeats the purpose of using a language-neutral tool, doesn't it?) such as picking out the "Root Namespace" (not that I'd know how off the top of my head) and including it in my code generation.
I don't want to leave out the global modifier either, because it protects the tool from users picking bad names for the generated output. Does anybody have a suggestion for how I should deal with this?
I have and still do program principally in a procedural manner. I've never created objects or ever used the OOP paradigm. I understand the concept certainly, and know generally how it works but have never implemented it. I presume this leaves me though with limited options in the future as OOP is and has been all the rage, especially now that VB.Net is full OOP. Event still, I've written both ASP.Net and VB.Net applications without using OOP, or not that the product didn't create itself.It appears I am not alone either, there seems to be a number of people far more intelligent and experienced than I that eschew OOP.
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