Q :What is a C# ?
- C# is a object oriented programming which is developed by the Microsoft which is currently used on Application development in the .Net platform.
- It’s developed by Andres Hajasberg.
- C# is an object oriented and user friendly. It gives security and reusability. We can develop multiple applications.
Q :What is the delegate ?
Delegate is a class which has the reference of a class or method. Delegate class has a signature and it can only reference those methods whose signature is compliant with the class.
Delegates are type safe functions pointers or callbacks.
For more about delegate click here
Q:What is the difference b/w convert.to.string and .to.string() method?
Convert function handles nulls while i.string() does not it will throw a null reference exception error.
Q:What is the difference between const and readonly?
overriding:-In which all the function name and passing parameters are same.
Q:What is the similarities b/w structure and class?
Q:What is the difference b/w convert.to.string and .to.string() method?
Convert function handles nulls while i.string() does not it will throw a null reference exception error.
Q:What is the difference between const and readonly?
- Constants are dealt with at compile-time.
- Constants support value-type variables so it is stored in stack .
- Constants should be used when it is very unlikely that the value will ever change.
- Read-only variables are evaluated at runtime.
- Read-only variables can hold reference type variables so it is stored in heap.
- Read-only variables should be used when run-time calculation is required.
Q:What are the type of comment in C# ?
- There are 3 types of comments in C# are :
- Single line (//)
- Multi (/* */)
- Page/XML Comments (///).
Q:What is the difference b/w operator overloading and overriding ?
operator overloading:-In which function name are same but the difference in only in passing perimeters. overriding:-In which all the function name and passing parameters are same.
Q:What is the similarities b/w structure and class?
- Both can have constructors, methods, properties, fields, constants, enumeration, events and event handlers.
- Structures and classes can implement interface.
- Both can have delegates and events.
- Both of them can have constructors with and without parameter.
Q:What are the wait handler?
- Wait handles sends signals of a thread status from one thread to other thread. There are three types of wait modes are :
- Wait One
- Wait Any
- Wait All
Q:What are the type of array ?
- There are three types of arrays in C# are :
- Single-Dimensional arrays
- Multidimensional arrays
- Jagged arrays.
Q:What is the difference b/w System.String and System.StringBuilder classes?
- System.String
- 1.Its a class used to handle strings...
- 2.Here concatenation is used to combine two strings...
- 3.String object is used to concatenate two strings...
- 4.The first string is combined to the other string by creating a new copy in the memory as a string object, and then the old string is deleted..
- 5.we say "Strings are immutable". ..
- String Builder....
- 1.This is also the class used to handle strings...
- 2.Here Append method is used...
- 3.Here, Stringbuilder object is used...
- 4.Insertion is done on the existing string...
- 5.Usage of StringBuilder is more efficient in case large amounts of string manipulations have to be performed
Q:What is the difference b/w boxing and unboxing ?
When a value type is converted to the object type, the process is known as boxingand,alternatively, when an object type is converted to the value type, the process is known as unboxing.
Q:What is the difference b/w dataset.clone and dataset.copy ?
Dataset.clone copies just the structure of dataset (including all the datatables, schemas, relations and constraints.); however it doesn't copy the data.
Dataset.copy copies both the dataset structure and the data.
Q: what is the enum ?
It is used to define constants.
Q: How to prevent your class from being inherited by another class?
Yes. The keyword "sealed" will prevent the class from being inherited.
Q:Why is the virtual keyword used in code?
The Virtual keyword is used in code to define methods and the properties that can be overridden in derived classes.
Q:What is jagged array ?
A jagged array is an array whose elements are arrays. The elements of a jagged array can be of different dimensions and sizes. A jagged array is sometimes called an "array-of-arrays."
Q:What is the difference b/w dataset.clone and dataset.copy ?
Dataset.clone copies just the structure of dataset (including all the datatables, schemas, relations and constraints.); however it doesn't copy the data.
Dataset.copy copies both the dataset structure and the data.
Q: what is the enum ?
It is used to define constants.
Q: How to prevent your class from being inherited by another class?
Yes. The keyword "sealed" will prevent the class from being inherited.
Q:Why is the virtual keyword used in code?
The Virtual keyword is used in code to define methods and the properties that can be overridden in derived classes.
Q:What is jagged array ?
A jagged array is an array whose elements are arrays. The elements of a jagged array can be of different dimensions and sizes. A jagged array is sometimes called an "array-of-arrays."
