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Posted By:      Posted Date: August 21, 2010    Points: 0   Category :ASP.Net

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abstract away the source of the connection string using a class with a static property.

ASP.NET provides a configuration system we can use to keep our applications flexible at runtime. In this article we will examine some tips and best practices for using the configuration system for the best results.

The element of a web.config file is a place to store connection strings, server names, file paths, and other miscellaneous settings needed by an application to perform work. The items inside appSettings are items that need to be configurable depending upon the environment, for instance, any database connection strings will change as you move your application from a testing and staging server into production.

Let's abstract away the source of the connection string using a class with a static property.

Class which contains an array of objects of type "Class2"



1  Partial Class _Default
2  Inherits System.Web.UI.Page

3 Public Function Ohjoy(ByVal X As Integer) As Integer
4 Dim theClass As New Class1 '= New Class1()
5    theClass.ReSize(0)
6    theClass.myBaby(0).GetName(0) = "Hello" 'Property Chars is read only'
7    Return 1
8 End Function
I have a first class named "Class1". I have a second class named "Class2" Class2, is a member of class 1,
and is implemented as an array of objects of type Class 2.

If I try and call the Accessor GetName() my hard coded value "Hello" in my accessor is not returned? Only
an alpha character like "T"

Also if I try and assigne a value using the setter GetName() it does not work, and the compiler gives me
an error message "property Chars is ReadOnly? Does anyone know what is wrong in my code? Line 6 above


Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
End Sub
End Class

Public Class Class1
    Dim bs As Integer
    Public myBaby() As Class2
    Public myB As Class2
    Public Function ReSize(By

BinaryFormatter, SortedSet base class and a few instance variables.

/* This example successfully serializes and deserializes the SortedSet<string> base contents, but all the instance variables show up uninitialized. Here's the output: n1: 0 n2: 0 str: s == "String 1" s == "String 2" s == "String 3" Any ideas? */ using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Runtime.Serialization.Formatters.Binary; using System.Runtime.Serialization; using System.IO; [Serializable] public class MyObject : SortedSet<string> {     public MyObject() : base() { }     protected MyObject(SerializationInfo info, StreamingContext context)         : base(info, context)     {     }     public int n1 = 0;     public int n2 = 0;     public String str = null; } namespace BasicBinarySerializationInheritanceFromSortedSet {     class BasicBinarySerializationInheritenaceFromSortedSetTest     {         static void Main(string[] args)         {             {                 MyObject obj = new MyObject();   &nb

read string and lable value from sql server by class

hi,i want to create multi language cms project,i don't like use resourse component visual studio.please help me to create class for resourcestring and use for lable and string value.and cms user can add new language by xml and webform anybody help to me

How to make an array of class objects in Visual Basic

How can I make an array of objects in VB.net. Here is the requirement.Basically I have a class named hotel. I need to dynamically add customersto the hotel class using the Customer class. So basically if in the Hotelclass I can have an array of Customer objects that would be great. How can I do this in VB .net ? Public Class Hotel  ' I need an array of Customer objects. objCustomers End Class   Public Class Customer Private custId As Integer Private custName As String Private custAddress As String Private custCity As StringEnd Class Pseudo code:  Dim Hilton As Hotel = new Hotel()   Hilton.objCustomers(5) ' Declare an array of 5 customer objects   Hilton.objCustomers(0).CustId=1  Hilton.objCustomers(0).CustName="JoJo Smith"  Hilton.objCustomers(0).custAddress="122 Emory Lane"  Hilton.custCity="Merry More"  .  .  .  Hilton.objCustomers(4).CustId=1  Hilton.objCustomers(4).CustName="Ice Baby"  Hilton.objCustomers(4).custAddress="66 Domino Drive"  Hilton.custCity="Miami"    End While

Database diagram failur - Invalid class string SSMS 2008

Hi There -  Help needed In SSMS 2008 (not express) the Database Diagram  cast the exeption "Invalid Class String" (MS Visual Database Tools). Why is this happening. I have used the diagram designer before succesfully My OS W7 - SqlServer 2008 - every thing updated  - every service pack installed I have tryed reinstall seceral times - not positiv What is going on - It had been working (1 month ago) Please help Freddy

how to get a class reference as a reference and not a string to send for a generic method

I got some property that i get using generic method, there for I dont have it's <T>and I want to send it to another generic method but , how the heck do I get it's <T> :P?please look at the code below to understandit gets an entity framework objects, scan all it's properties and if the property is another entity framework object it would send it back to him self , the issue is that i dont know the new object <T> to send it back to him self :(search for the bold part to see what i'm missing//contains objects which we added so there wont be double adding private List<object> _addedObjects; public FakeGenericRepositoryExtension() { _addedObjects = new List<object>(); } public void Create<T>(T entity) where T : class { //add to created objects _addedObjects.Add(entity); //do something with object //... //start recircle process Type entityType = typeof(T); //run thrue each member of Type foreach (var member in typeof(Type).GetProperties()) { //get member value var member_value = member.GetValue(entity, null); //if not null //we must test this otherwise we can't get .BaseType if (member_value != null) { //get current member's base type string memberBaseType = member.GetValue(entity, null).GetType().BaseTyp

class contains non-dependency-property data members that are DependencyObject objects, you must also


I was reading the article Freezable Objects Overviewand came acrosee the statement

"If  your class contains non-dependency-property data members that are DependencyObject objects, you must also call the OnFreezablePropertyChanged method each time you change on of their values, even if you're setting the member to null. "

I quite do not understand the part about non-dependency-property data members that are DependencyObject objects. Can some one explain exactly what this means? If a data member is derived from the DependencyObject  class how then can the data member be a non dependency property?

I am also trying to locate some source code / project that overrides the OnFreezablePropertyChanged method, and have yet to find any on the interenet.

If anyone know whe

using UpdateSourceTrigger=Explicit with GetBindingExpression() on class objects with inherited



I have a class that inherits from FrameworkElement and has a mixture of DPs that I've added and the ones inherited e.g. WidthProperty, HeightProperty etc...

I have a UserControl that inherits from my class and has various textboxes in a popup resource like this

<TextBox Text="{Binding Path=Width, UpdateSourceTrigger=Explicit}" />

I've added a click button so that when the user changes one of the textboxes (in the popup), a routedUIcommand will fire (see below).


 public static void OkCommand_Executed(object sender, RoutedEventArgs e)
      MyClass c = (MyClass)sender;

//this seems to work fine because it is implicitly declared in my class
      BindingExpression be = s.GetBindingExpression(MyClass.MyPropertyProperty);
      if (be != null) be.UpdateSource();

//this does not work because the DP is inherited from FrameworkElement. It is returning null.
      BindingExpression be = s.GetBindingExpression(MyClass.WidthProperty);
      if (be != 

How to convert DataTable objects to IList without using For Each Loop


DataTable result = GetDataSetByQuery(query).Tables[0]
IList<string> li=new IList<string>();

Can we implement through LINQ ?

How to create an array of VB.net objects from a VB .net class


I need to create an array of a class type. Populate the values in the class and then pass
the array to a subroutine. I havent figured out how to do this properly as I get a null
reference exception. Can someone show me how to create/instantiate the array of objects?
Here is a simple example with only one property named "_momentum". My actuall class has about
10 properties/variables in actuality

Public Class Torsion

 Dim _momentum As integer

 Public Property Momentum
            Return _momentum
    End Get
    Set(ByVal As Integer)
      _momentum = value
End Propterty

' Later in the code I try to create and object of the class

Dim x(0) As Torsion

Class to discover if a string is a legal variable name


Does a class exist to verify that a string contains a valid variable name. I am generating code based on user input and need to verify it.


ie: First character is [_a-Z], followed by up to 'n' [a-z0-9_] and is not a reserved word, now or in the future.

I think I could do it via reflection and compiling it, but that seems a bit heavy-handed.

I would also prefer if I could exclude legal names like 'var' and 'partial', 

Paul Cotter

Application variable or static class for global string?


I need to keep a global variable throughout the whole time the user is at my site, but do I use Application or a static class? The string variable should store a region name and my site makes a few changes depending on which region that has been set.

I read that Application was mainly for classic ASP, but I also read that a static class cannot be instantiated at runtime (e.g. when the user has logged in).

So, have I got something wrong here and which solution do I use?



Class Diagrams

Class diagrams show the static structure of the systems. Classes define the properties of the objects which belong to them. These include:

Attributes - (second container) the data properties of the classes including type, default value and constraints.

Creating a Simple Class in C#

The second article in the C# Object-Oriented Programming tutorial describes how classes are created in C# and how behaviour, in the form of publicly visible and private, hidden methods can be added. This demonstrates some of the uses of encapsulation

Static Class for Beginners

In general, the members of a class can be accessed by instance of that class when they are in public, but there comes a situation to access or call members of a class without an instance and this can be achieved by declaring them as static
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