ASP.NET Page Life Cycle

ASP.NET Page life cycle having different stages and in each stage there are different events, which are having a sequence of flow. i.e. each stage or event will fire one after one in an ordered manor, each and every developer should have a basic knowledge on flow of the Page life cycle then only one can write our code in more poper way.

Events :

• PreInit
• Init
• InitComplete
• PreLoad
• Load
• Control Events (Post back events)
• LoadComplete
• PreRender
• PreRenderComplete
• SaveStateComplete
• Render
• Unload

PreInit :
The first event in Page life cycle, In this event if any value assigned to the controls that may overwritter because in the InIt event controls value will be restored from view state. Prefer this event to creating or re-creating dynamic controls.

Init :
First this event will be raised for each control , then finally Init event for page will be raised. Prefer this event to set control properites.

InitComplete :
View state will be saved persistently in this event,In this event any changes done in viewstate that will be available even in next postback.

PreLoad :
The post back data that is included with the request instance will be processed.

Load :
First this event will be raised for page then it will be raised for all controls in the page. Use this event to set the control default values, binding dropdown list and other when first time page loads (if not postback).

Control Events (Post back events) :
After page load, the specific control post back events will be fired. (ex : button click, dropdown selectedindexchanged, gridview pageindexchanged, textbox textchanged,...)

LoadComplete :
This event will be raised after Control events and before PreRender event.

PreRender :
PreRender event will be first raised for the Page, then it will raise for all the controls in the page. Any final modification on the control values you want to perform has to be done at least here, after this event if you done any changes for the control values it will affect rendaring but not be retrived in the next postback.

PreRenderComplete :
Raises for each control and page after it's PreRender event completed.

SaveStateComplete :
This event will be raised after the viewstate and control state have been saved for the page and all controls.

Render :
Render is a method, not event. you can over ride this method to change the output of the control markup.

Unload :
This event will first raises for each control then finally for page.

ADO.Net

Reference :

1 DataTable

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Reflection

The extraction of information about an application is called reflection and makes extensive use of metadata that is gathered from the compilation process

C# interview question part I

1 Describe the difference between a Thread and a Process?

2 What is a Windows Service and how does its lifecycle differ from a "standard" EXE?

3 What is the maximum amount of memory any single process on Windows can address? Is this different than the maximum virtual memory for the system? How would this affect a system design?

4 What is the difference between an EXE and a DLL?

5 What is strong-typing versus weak-typing? Which is preferred? Why?

6 Corillian's product is a "Component Container." Name at least 3 component containers that ship now with the Windows Server Family.

7 What is a PID? How is it useful when troubleshooting a system?

8 How many processes can listen on a single TCP/IP port?

9 What is the GAC? What problem does it solve?

10 What is serialization in .NET? What are the ways to control serialization?

11 Does C# support multiple inheritance?

12 What’s the implicit name of the parameter that gets passed into the class’ set method?

13 What’s the top .NET class that everything is derived from?

14 How’s method overriding different from overloading?

15 What is CLR?

16 What is CTS?

17 What is CLS?

18 What is strong name?

19 What is Application Domain?

20 Describe the difference between Interface-oriented, Object-oriented and Aspect-oriented programming.

21 Describe what an Interface is and how it’s different from a Class.

22 What is Reflection?

23 What is the difference between XML Web Services using ASMX and .NET Remoting using SOAP?

24 Are the type system represented by XmlSchema and the CLS isomorphic?

25 Conceptually, what is the difference between early-binding and late-binding?

26 Is using Assembly.Load a static reference or dynamic reference?

27 When would using Assembly.LoadFrom or Assembly.LoadFile be appropriate?

28 What is an Asssembly Qualified Name? Is it a filename? How is it different?

29 Is this valid? Assembly.Load("foo.dll");

30 How is a strongly-named assembly different from one that isn’t strongly-named?

31 Can DateTimes be null?

32 What is the JIT? What is NGEN? What are limitations and benefits of each?

33 How does the generational garbage collector in the .NET CLR manage object lifetime? What is non-deterministic finalization?

34 What is the difference between Finalize() and Dispose()?

35 How is the using() pattern useful? What is IDisposable? How does it support deterministic finalization?

36 What does this useful command line do? tasklist /m "mscor*"

37 What is the difference between in-proc and out-of-proc?

38 What technology enables out-of-proc communication in .NET?

39 When you’re running a component within ASP.NET, what process is it running within on Windows XP? Windows 2000? Windows 2003?

40 What is FullTrust? Do GAC’ed assemblies have FullTrust?

41 What are Satellite Assemblies?

42 What is Global Assembly Cache (GAC) and what is the purpose of it?

43 What is Reflection in .NET?

44 What is the managed and unmanaged code in .net?

45 What are Namespaces?

46 What are the access-specifiers available in c#?

47 Advantage of ADO.Net?

48 Difference between OLEDB Provider and SqlClient ?

49 Differences between dataset.clone and dataset.copy?

50 In a Webservice, need to display 10 rows from a table. So DataReader or DataSet is best choice?

51 What is Remoting?

52 What’s the difference between System.String and System.StringBuilder classes?

53 What’s a delegate?

54 What’s an interface class?

55 What is the transport protocol you use to call a Web service ?

56 What’s wrong with a line like this? DateTime.Parse(myString);

57 What are PDBs? Where must they be located for debugging to work?

58 What is cyclomatic complexity and why is it important?

59 Write a standard lock() plus “double check” to create a critical section around a variable access.

60 What benefit does your code receive if you decorate it with attributes demanding specific Security permissions?

61 What does this do? gacutil /l | find /i "Corillian"

62 What does this do? sn -t foo.dll

63 What ports must be open for DCOM over a firewall? What is the purpose of Port 135?

64 Contrast OOP and SOA. What are tenets of each?

65 How does the XmlSerializer work? What ACL permissions does a process using it require?

66 Why is catch(Exception) almost always a bad idea?

67 What is the difference between Debug.Write and Trace.Write? When should each be used?

68 What is the difference between a Debug and Release build? Is there a significant speed difference? Why or why not?

69 Does JITting occur per-assembly or per-method? How does this affect the working set?

70 Contrast the use of an abstract base class against an interface?

71 What is the difference between a.Equals(b) and a == b?

72 In the context of a comparison, what is object identity versus object equivalence?

73 How would one do a deep copy in .NET?

74 Explain current thinking around IClonable.

75 What is boxing?

76 Is string a value type or a reference type?

77 What is the significance of the "PropertySpecified" pattern used by the XmlSerializer? What problem does it attempt to solve?

78 Why are out parameters a bad idea in .NET? Are they?

79 Can attributes be placed on specific parameters to a method? Why is this useful?

80 Juxtapose the use of override with new. What is shadowing?

81 Explain the use of virtual, sealed, override, and abstract.

82 Explain the importance and use of each component of this string: Foo.Bar, Version=2.0.205.0, Culture=neutral, PublicKeyToken=593777ae2d274679d

83 Explain the differences between public, protected, private and internal.

84 What benefit do you get from using a Primary Interop Assembly (PIA)?

85 By what mechanism does NUnit know what methods to test?

86 What is the difference between: catch(Exception e){throw e;} and catch(Exception e){throw;}

87 What is the difference between typeof(foo) and myFoo.GetType()?

88 Explain what’s happening in the first constructor: public class c{ public c(string a) : this() {;}; public c() {;} } How is this construct useful?

89 What is this? Can this be used within a static method?

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