.Net- Avoid Closures When Defining Lambda Functions?
May 17, 2012In vb.net, this is serializable:
<Serializable()>
Class FunctionHolder
Private _F As Func(Of Double, Double)
[code].....
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What Is Attribute And What Is Its Use While Defining Functions,Sub Or Class
Sep 3, 2010i am comfortable with class, namespace ,Sub ,Function ,Properties ...and so on. i studied about Custom Controls and Extension methods. There i found something new so called Attribute that are placed before classes and Functions definitions.[code...]
View 4 RepliesWrite Functions In Microsoft.NET (VB) To Avoid Memory Leaks?
May 8, 2012What is the best way to write functions in Microsoft.NET (VB) to avoid memory leaks. I have always followed this style:
Public Sub TestMemoryLeak()
Dim testCon As SqlConnection
Try
[code].....
Here the connection reference is created before the TRY clause and is initialised after the TRY clause. I believe the connection is always closed and dereferenced even if an exception is thrown. Is this good practice? I see a lot of code that creates references and dereferences in the TRY clause, but this would mean that the memory is not correctly handled if an exception is thrown. Some developers say they don't like to clean up in the finally clause.
Lambda Coding - Basic Code Of Lambda With Explanation
Jun 21, 2011Im hearing about this, can someone explain it to me or please show some basic code of Lambda with explanation.
View 2 RepliesLambda Tutorial And Solving A Lambda-Function
Dec 14, 2009Is it possible to shorten the following function to a lambda expression?Or (to do the trick by myself) what is the best and most understandable for beginners tutorial for lambda in vb.net?[code]
View 2 RepliesVS 2008 : Have A Class Where The Functions Of The Same Name Are Both Instance Functions And Shared Functions?
Dec 6, 2010What I am trying to do is have a class where the functions of the same name are both instance functions and shared functions.
Public Shared Function Get...(byval xx as xx)
and
Public Function Get...
The Public Function uses a Property xx created in the constructor, whereas the Shared Function has the parameters (byval xx as xx).
Excel Maths Functions And Calls To All DLL Functions Documentation?
Jan 29, 20071) Is it possible to access the Excel mathematical functions without actually opening Excel?
I was thinking of through a DLL WinAPI call or maybe a delegate function or smaller program?
2) Does anyone know of a MS link or area that gives instruction on "how to" use every function of every Windows DLL at all?
Or for all those that Microsoft have chosen to document online at least.
Differences Between VB Functions And Convert.To* Functions?
Feb 19, 2009While converting types, I have found myself using both VB functions and BCL Convert.To* methods.
E.g.)
Cstr() vs. Convert.ToString()
CInt() vs. Convert.ToInt32()
CDbl() vs. Convert.ToInt64()
etc...
Are there any subtle differences that should be noted?
[2005] MembershipUser Functions - See Exactly What The Functions Are Doing?
Mar 4, 2009Is there a way to see exactly what the functions are doing. What i mean is there a way to see the class? I know what it does, i just want to know the code.
For example the function: Membership.FindUsersByName()
Defining Own Pen Colors?
Oct 2, 2009Am I just limited to the VB pen colors, e.g color.orange, color.black etc or can I define my own rgb colors? If so, how do I do that?
View 4 RepliesDefining Something As A Class
Jul 17, 2009I have .cls files that have attributes for XML files, and i would like to refer to them in the main body of my code without having to define each one as a class in the code as this would be writing them twice. How can i refer to a .cls file in a vb.net form? If you're not living on the edge, you're taking up too much room
View 5 RepliesDefining An Interface Like Idispose
Nov 10, 2009I would like to define an interface in the same manner as IDispose. By this I mean that when the interface is implemented it would add functional code.
For example when IDispose is implemented it adds a fully defined Dispose method rather than just an empty sub routine.
Defining C# Enums With Descriptions
Jan 27, 2010What would the folowing VB.NET enum definition look like in C#? [code]
View 7 RepliesDefining Controls From A Different Class?
Sep 16, 2009How do I define the controls from another class? Here is my code (highlighted) -
Imports System.Windows.Forms
Namespace Bryanlgh.Echo.Views
Namespace Bryanlgh.Core.Tasks
[Code]....
I also tried using Imports Bryanlgh.Echo.Views instead of Namespace and it also came up with 3 error messages -
1. Namespace or type specified in the Imports ' Bryanlgh.Echo.Views' doesn�t contain a public member or cannot be found.
2. Name 'cboPcpMd is not declared.
3. Name 'cboPhysicianPerforming' is not declared
How should I define these controls?
Defining Different Datasource For Dropdown?
Jan 22, 2010I have a dropdown where the items initially are filtered (using a SQL Datasource) based on the selection of another dropdown; however, I have included a checkbox where if checked, the dropdown needs to populate with all data from another datasource How do I programatically remove a datasource that is bound to a control and then define another?
I have the following code, but it errors:
If cbOverrideArea.Checked Then
Me.ddArea.Items.Clear()
[code].....
Defining Ranges For Excel In .NET?
Jun 21, 2010I am using Excel interop in my VB.NET program. My problem is that I can't seem to figure out how to write to Excel *and* define the Range using numbers.Alright, so I have objects being created depending on the file that the user opens. So there could be 100 objects or there could be none. Now each object has an array of values, and these arrays contain nearly 15000 elements. So here is what I want to do but I can't figure out how to escape using the LetterNumber:LetterNumber combination.
For every object I want a new column to be occupied and for every element in the objects array I want the row to be occupied. I figured the easiest way to do this was using a for loop but, again, I can't use numbers.
For columns = 0 to NumberOfObjects
For rows = 0 to NumberInArray
Cell(0,0).Value = myObjectsCollection(column).Array(rows)
Next
Next
Defining Ranges For Excel?
Aug 10, 2010I am using Excel interop in my VB.NET program. My problem is that I can't seem to figure out how to write to Excel and define the Range using numbers.
Alright, so I have objects being created depending on the file that the user opens. So there could be 100 objects or there could be none. Now each object has an array of values, and these arrays contain nearly 15000 elements. So here is what I want to do but I can't figure out how to escape using the LetterNumber:LetterNumber combination.
For every object I want a new column to be occupied and for every element in the objects array I want the row to be occupied. I figured the easiest way to do this was using a for loop but, again, I can't use numbers.
For columns = 0 to NumberOfObjects
For rows = 0 to NumberInArray
Cell(rows , columns).Value = myObjectsCollection(column).Array(rows)
Next
Next
Defining Relationship Between Tables?
Dec 15, 2011How do we create relation ships between tables using a sql query?im using MS Access and VB.net.
View 2 RepliesDefining Types In Declarations
Jun 1, 2010I used to do this is VB6:
Type Record
A As Long
B As String
End Type
Dim Rec As Record
When I keyed in "Type" in my declarations, I was asked to change it to "Structure". After that, I was not able to define anything inside. So, what do I need to do?
Defining A Name For A Variable Range Size?
Feb 18, 2012I have to define a name for a varying-length column of cells. The name is used later to define the range for a Data Validation List. I just cannot figure out (and the Help Function isn't assisting) how to define the Name, say "DropOrdNum" using a variable as the address for the last cell in the range. It is easy to define a name for "O13:O2000" - no problem, but then I have a whole lot of blanks in my drop-down list. But how do I define a name for "O13:LastCell", by making "LastCell" the Range Variable (am I correct in this) for the address of the last cell in the active range and then defining the name "DropOrdNum" as being the range "O13" to either "O(the row number of the last cell)" or "LastCell", being the address of the last cell in the active range, which varies by the hour?
View 2 RepliesDefining Arrays And Alloocating Data To Them
Jan 29, 2011I know you can dimention a variable and assign data to it at the same time using dim a() [1,2,3,4,5,6,7}but how can you do this with multiple arrays.is it something like [code]
View 4 RepliesDefining Implicit Casting Operators?
Aug 21, 2009In C# you can use the implicit keyword to define an implicit user-defined type conversion operator.In VB.NET you can define a CType conversion operator that will explicitly convert a user-defined type into another type.Is there a way to declare an implicit conversion operator in VB.NET?
View 1 RepliesDefining More Than One Variable In A Vb2005 For Loop
May 14, 2009Is 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++){}
Defining One Event For Multiple Fields?
Apr 3, 2010The below sub-procedure isn't working like I expect it to. Basically, I have 9 fields on a tab control. When a user clicks in one of the fields, I wish for the field to "SelectAll" if their is a value already in the field. As you can see, the way I have it structured...only 1 field will do this, however, even this is not working.
Private Sub txtAddr1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtAddr1.Click, txtAddr2.Click, _
txtAddr3.Click, txtCity.Click, _
cmbState.Click, txtZip.Click, _
[code]....
Side Of Defining Extension Method?
Dec 16, 2011I've got a bunch of duplicate code that looks like this:If mValue is Nothing Return ""Return mValue.ToUpper
I defined the following extension method to reduce duplicate code:
[Code]...
Using MembershipProvider In WinForms Without Defining App.Config?
Jan 27, 2011How can I use a MembershipProvider in a Winforms application without defining ConnectionStrings, Membership and RoleManager sections in app.config but creating instead all needed objects and configuration settings at runtime?
View 1 RepliesVS 2008 Defining Words In A Program?
Oct 28, 2009So my latest project focuses on sending txt commands over from my cell phone to my email, which gets read by a program, that carries out the specified command. My latest command i want to implement, is being able to define words, and have it send me a txt back with the definition. Now I know how to send texts, and all of that stuff, but I have found it hard to find anything on defining words. At first, i tried to read websites, and simple redirect a webpage to google definitions, but that led me nowhere.
View 1 RepliesVS 2010 Defining A Property As A Dictionary?
Sep 29, 2011I am trying to create a property and declare it as a dictionary. This property will be updated and called upon throughout my project. I may be complicating the issue but here is what I have...
vb.net
Private Shared m_ItemName As Dictionary(Of Integer, String)
Public Shared Property ItemName(ByVal Tkey As Integer, Tvalue As String) As Dictionary(Of Integer, String)
Get
[code]....
What I wish to do with the dictionary is to keep a record of the amount of items selected, the Key will be the Integer in the dictionary and will be the ID of that item in a database while the String will be the name of the item matched to that ID in the database.The user will be allowed to enter up to no more than 10 items at a time (overkill but necessary for the unknown).I was originally going to use an array statically declared allowing up to 10 items (eg. Private Shared m_ItemName(,) As String = New String(9,9) {})
Creating Datatable By Code Without Defining Dataset?
Dec 15, 2011I have connected my sql db with vb and I m trying to make a UI. My question is that when I write code in order to create datatables and I fill them with the results of queries I've created, where do these datatables belong? I'm wondering if I have to define a new dataset or do they belong to the existed dataset which is created by the dataset configuration wizard??
View 3 RepliesDefining Interface With Restrictions As To What Classes Can Implement It
Nov 30, 2010How do I limit an Interface when defining it? What is the correct technical term for what I am describing?For example, I want MyInterface to only be implemented for objects that implement IList(Of T) and ICollection(Of T).
View 5 Replies