Dot Net Tutorials

Key differences in features of .NET 2.0 and 3.5? 
.NET 3.5 has more advanced feature than .NET 2.0.They are WCF, WPF, WCS,WF and LINQ.

Is Dot-Net platform dependent or platform indipendent?
Net is not platform independent as it needs .Net framework to run. As MS is the owner, so it is including .Net frameworks in latest versions of Windows.MS is providing service pack using which you can manage old versions of Windows and other operating systems like Unix, Linux. But not yet, .Net is running in UNIX and Linux. So it is not platform independent. As it comprises of lot of languages, you can say it as language independent.
MS is saying Windows is best operating system but they are developing Windows OS on Unix platform.Also Java, it is also not platform independent as it requires JVM (Java Virtual Machine to run). But the case is JVM is coming in all operating systems by default. So you can take it as platform independent.

What is CAS? 
CAS: CAS is the part of the .NET security model that determines whether or not a piece of code is allowed to run, and what resources it can use when it is running. For example, it is CAS that will prevent a .NET web applet from formatting your hard disk. How does CAS work? The CAS security policy revolves around two key concepts - code groups and permissions. Each .NET assembly is a member of a particular code group, and each code group is granted the permissions specified in a named permission set. For example, using the default security policy, a control downloaded from a web site belongs to the ‘Zone - Internet’ code group, which adheres to the permissions defined by the ‘Internet’ named permission set. (Naturally the ‘Internet’ named permission set represents a very restrictive range of permissions.) 

IIS port number? How We get it? 
IIS default port numbers for http is 80 , for https 81, and for ftp its 21. These are the default port numbers but we can override this port numbers while creating a website (either SSL or normal) and while creating a ftp folder. 

What is postback form and what is autopostback? 
PostBack: It means page automatically goes to server and we can just make a check whther our page is on server for the first time or not.
Propert Page.IspostBack== true means your page has made a server visit. It is only a readOnly property i.e. we can only check that, cannot set this property accordingly.
AutoPostBack: It is property for .net controls to allow them to post the page to server and execute code-behind code at their events.
By Default,Button has this property set to true. For other controls like DropDownList,RadioButtonList etc., we have to set set it to true if we want to perform an action at their events like selectedIndexChanged etc.

How can you tell the application to look for assemblies at the locations other than its own install? 
Use the directive in the XML .config file for a given application. Make Your Homepage.

What is the purpose of .net frame work? 
.Net Framework is an umbrella technology and has a lot of different technologies under it. For example, it
1. introduces Asp.net for web development
2. has languages to write Windows program, Windows services, Web Services.
3. pre-coded solutions to common programming problems     called base class library. It includes user interface data accessdatabase connectivity cryptography web application development, numeric algorithms, and network communications
4. a runtime or virtual machine that manages the execution of programs written specifically for the framework,
5. and a set of tools for configuring and building applications  like visual studio.
It also introduces language independence by introducing common language runtime. You can write code in any language.
The .NET Framework is a key Microsoft offering and is intended to be used by most new applications created for the Windows platform.

What is the difference between visual basic and visual basic dot net?
VB.NET is Microsoft’s Visual Basic implemented onto their .NET Framework. While Visual Basic is part of Visual Studio, VB.NET is also part of the Visual Studio.NET release.

What is JIT(Just In Time) and How it works? 
Before the code can be executed,the .NET framework needs to convert the IL into CPU-specific code.the Just-In-Time(JIT) compiler translates the code from IL into managed native code.During the compilation,the JIT compiler compiles only the code that is required during execution instead of compiling the complete IL code.when an uncompiled method is invoked during execution,the JIT compiler converts the IL for that method into native code.during this  the code is also checked for type safety,Type safety ensures that objects are always accessed in a compilation way.

Crystal Reports

How to Pass string value to crystal report 11?
Code for this

Dim crParameterFieldDefinitions As ParameterFieldDefinitions
Dim crParameterFieldDefinition AsParameterFieldDefinition
Dim crParameterValues As New ParameterValues
Dim crParameterDiscreteValue1 As NewParameterDiscreteValue

crParameterDiscreteValue1.Value = Trim(tbPRAM.Text) — text box to hold value

crParameterFieldDefinitions =cryRpt.DataDefinition.ParameterFields()
crParameterFieldDefinition = crParameterFieldDefinitions.Item(”PRAM”)
crParameterValues =crParameterFieldDefinition.CurrentValues

crParameterValues.Clear()
crParameterValues.Add(crParameterDiscreteValue1)

crParameterFieldDefinition.ApplyCurrentValues(crPar ameterValues)

parameter PRAM must be set in your report.

How does VB.NET/C# achieve polymorphism? 
You can achive polymorphism by doing overloading and overwriting.