Multiple Catch Blocks for Try Block in C#

              In this article, I would like to know you about multiple catch blocks for try block.

Actually the Exception class is the super class for all the exceptions, so this Exception class catch block should be at end of all catch blocks, if not it shows an error message at compile time only i.e., A previous catch clause already catches all exceptions of this or of a super type ('Exception').

So that to avoid compile time errors, we have to set the order of different exception catch blocks.

Difference between constant and read-only in C#

                             Constant and readonly keywords in C# are used to maintain the value throughout the application without any change. But constant should be assigned a value at the time of declaration only, but there is no need to assigned value at the time of declaration of readonly variable, can be assigned a value in constructor. The following example shows below clarifies about the constant and readonly.

Difference Between string and StringBuilder in C#

    String is class and string is datatype, string is alias name of String, so there is no difference between string and String. String is immutable which cannot change in size and StringBuilder is mutable which can change in size. The following example shows the difference between string and StringBuilder.

Difference between Interface and Abstract Class In C# ?

Interface	Abstract Class
Interface Keyword is given before the name of the Interface                 public interface IAbc         {             ////         }	Abstract keyword is used before the name  of the class        public abstract class Abc         {             ////   }

Difference between Value Type and Reference Type?

Value Type	Reference Type
i)   Value Type variable contains the value      itself.	i)        Reference Type variable that contains        reference or address of the actual data.
ii)    Value Type stores data in  stack. Eg:- int a = 100;                         100            a      Stack memory	iii)      Reference Type stores data in managed         heap and stores address of the data in         stack. Eg:-                int a=100; Object obj1 = a;                  Heap memory 100                                                       1002                                 |                                 |                                 |                                 |                            |   ↓ 1002          obj1      100 a Stack memory
iv)                 Value Types are:- a)      Integral types (sbyte, byte, short, ushort, int, uint, long, ulong) b)      Bool type c)       Char type d)      Floating point type (float, double) e)      Decimal type f)       Struct types g)      Enumeration types	iv)                     Reference Types are :- a)      Object type b)      Class type c)       Interfaces d)      Delegates e)      String type f)       arrays