1• Why is it a bad idea to throw your own exceptions?
Well, if at that point you know that an error has occurred, then why not write the proper code to handle that error instead of passing a new Exception object to the catch block? Throwing your own exceptions signifies some design flaws in the project.
2• So how do you retrieve the customized properties of a .NET application from XML .config file? Can you automate this process?
Initialize an instance of AppSettingsReader class. Call the GetValue method of AppSettingsReader class, passing in the name of the property and the type expected. Assign the result to the appropriate variable. In Visual Studio yes, use Dynamic Properties for automatic .config creation, storage and retrieval.
3• What are jagged array?
The dictionary meaning of array is an orderly arrangement or sequential arrangement of elements.
In computer science term:
An array is a data structure that contains a number of variables, which are accessed through computed indices. The variables contained in an array, also called the elements of the array, are all of the same type, and this type is called the element type of the array.
An array has a rank that determines the number of indices associated with each array element. The rank of an array is also referred to as the dimensions of the array. An array with a rank of one is called a single-dimensional array. An array with a rank greater than one is called a multi-dimensional array. Specific sized multidimensional arrays are often referred to as two-dimensional arrays, three-dimensional arrays, and so on.
Jagged arrays
A jagged array is an array whose elements are arrays. The elements of jagged array can be of different dimensions and sizes. A jagged array is sometimes called as “array-of-arrays”. It is called jagged because each of its rows is of different size so the final or graphical representation is not a square.
When you create a jagged array you declare the number of rows in your array. Each row will hold an array that will be on any length. Before filling the values in the inner arrays you must declare them.
Jagged array declaration in C#:
For e.g. : int [] [] myJaggedArray = new int [3][];
Declaration of inner arrays:
myJaggedArray[0] = new int[5] ; // First inner array will be of length 5.
myJaggedArray[1] = new int[4] ; // Second inner array will be of length 4.
myJaggedArray[2] = new int[3] ; // Third inner array will be of length 3.
Now to access third element of second row we write:
int value = myJaggedArray[1][2];
Note that while declaring the array the second dimension is not supplied because this you will declare later on in the code.
Jagged array are created out of single dimensional arrays so be careful while using them. Don’t confuse it with multi-dimensional arrays because unlike them jagged arrays are not rectangular arrays.
4• What is a delegate, why should you use it and how do you call it ?
A delegate is a reference type that refers to a Shared method of a type or to an instance method of an object. Delegate is like a function pointer in C and C++. Pointers are used to store the address of a thing. Delegate lets some other code call your function without needing to know where your function is actually located. All events in .NET actually use delegates in the background to wire up events. Events are really just a modified form of a delegate.
It should give you an idea of some different areas in which delegates may be appropriate:
They enable callback functionality in multi-tier applications as demonstrated in the examples above.
The CacheItemRemoveCallback delegate can be used in ASP.NET to keep cached information up to date. When the cached information is removed for any reason, the associated callback is exercised and could contain a reload of the cached information.
Use delegates to facilitate asynchronous processing for methods that do not offer asynchronous behavior.
Events use delegates so clients can give the application events to call when the event is fired. Exposing custom events within your applications requires the use of delegates.
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ASP.NET INTERVIEW QUESTIONS AND ANSWERS PART ONE
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ASP.NET INTERVIEW QUESTIONS AND ANSWERS PART THREE
ASP.NET INTERVIEW QUESTIONS AND ANSWERS PART FOUR
ASP.NET INTERVIEW QUESTIONS AND ANSWERS PART FIVE
ADO.NET INTERVIEW QUESTIONS AND ANSWERS PART ONE
ADO.NET INTERVIEW QUESTIONS AND ANSWERS PART TWO
You can also learn the concept of frame work concept in detail with questions and answers in the following place.
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART ONE
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART TWO
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART THREE
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART FOUR
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART FIVE
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART SIX
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART SEVEN
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART EIGHT
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART NINE
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART TEN
Well, if at that point you know that an error has occurred, then why not write the proper code to handle that error instead of passing a new Exception object to the catch block? Throwing your own exceptions signifies some design flaws in the project.
2• So how do you retrieve the customized properties of a .NET application from XML .config file? Can you automate this process?
Initialize an instance of AppSettingsReader class. Call the GetValue method of AppSettingsReader class, passing in the name of the property and the type expected. Assign the result to the appropriate variable. In Visual Studio yes, use Dynamic Properties for automatic .config creation, storage and retrieval.
3• What are jagged array?
The dictionary meaning of array is an orderly arrangement or sequential arrangement of elements.
In computer science term:
An array is a data structure that contains a number of variables, which are accessed through computed indices. The variables contained in an array, also called the elements of the array, are all of the same type, and this type is called the element type of the array.
An array has a rank that determines the number of indices associated with each array element. The rank of an array is also referred to as the dimensions of the array. An array with a rank of one is called a single-dimensional array. An array with a rank greater than one is called a multi-dimensional array. Specific sized multidimensional arrays are often referred to as two-dimensional arrays, three-dimensional arrays, and so on.
Jagged arrays
A jagged array is an array whose elements are arrays. The elements of jagged array can be of different dimensions and sizes. A jagged array is sometimes called as “array-of-arrays”. It is called jagged because each of its rows is of different size so the final or graphical representation is not a square.
When you create a jagged array you declare the number of rows in your array. Each row will hold an array that will be on any length. Before filling the values in the inner arrays you must declare them.
Jagged array declaration in C#:
For e.g. : int [] [] myJaggedArray = new int [3][];
Declaration of inner arrays:
myJaggedArray[0] = new int[5] ; // First inner array will be of length 5.
myJaggedArray[1] = new int[4] ; // Second inner array will be of length 4.
myJaggedArray[2] = new int[3] ; // Third inner array will be of length 3.
Now to access third element of second row we write:
int value = myJaggedArray[1][2];
Note that while declaring the array the second dimension is not supplied because this you will declare later on in the code.
Jagged array are created out of single dimensional arrays so be careful while using them. Don’t confuse it with multi-dimensional arrays because unlike them jagged arrays are not rectangular arrays.
4• What is a delegate, why should you use it and how do you call it ?
A delegate is a reference type that refers to a Shared method of a type or to an instance method of an object. Delegate is like a function pointer in C and C++. Pointers are used to store the address of a thing. Delegate lets some other code call your function without needing to know where your function is actually located. All events in .NET actually use delegates in the background to wire up events. Events are really just a modified form of a delegate.
It should give you an idea of some different areas in which delegates may be appropriate:
They enable callback functionality in multi-tier applications as demonstrated in the examples above.
The CacheItemRemoveCallback delegate can be used in ASP.NET to keep cached information up to date. When the cached information is removed for any reason, the associated callback is exercised and could contain a reload of the cached information.
Use delegates to facilitate asynchronous processing for methods that do not offer asynchronous behavior.
Events use delegates so clients can give the application events to call when the event is fired. Exposing custom events within your applications requires the use of delegates.
RELATED POST
ASP.NET INTERVIEW QUESTIONS AND ANSWERS PART ONE
ASP.NET INTERVIEW QUESTIONS AND ANSWERS PART TWO
ASP.NET INTERVIEW QUESTIONS AND ANSWERS PART THREE
ASP.NET INTERVIEW QUESTIONS AND ANSWERS PART FOUR
ASP.NET INTERVIEW QUESTIONS AND ANSWERS PART FIVE
ADO.NET INTERVIEW QUESTIONS AND ANSWERS PART ONE
ADO.NET INTERVIEW QUESTIONS AND ANSWERS PART TWO
You can also learn the concept of frame work concept in detail with questions and answers in the following place.
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART ONE
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART TWO
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART THREE
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART FOUR
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART FIVE
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART SIX
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART SEVEN
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART EIGHT
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART NINE
MICROSOFT DOT NET FRAME WORK QUESTIONS AND ANSWERS PART TEN
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