ASP.NET Lecture Series

1. Prof. Neeraj Bhargava
Pramod Singh Rathore
Department of Computer Science
School of Engineering & System Sciences,
MDS University Ajmer, Rajasthan, India
1
Type System

2. TYPE SYSTEM
 The common type system defines how types are declared,
used, and managed in the runtime, and is also an important
part of the runtime's support for cross-language integration.
The common type system performs the following functions:
 Establishes a framework that helps enable cross-language
integration, type safety, and high performance code
execution.
2

3. TYPE SYSTEM
 Provides an object-oriented model that supports the
complete implementation of many programming languages.
 Defines rules that languages must follow, which helps
ensure that objects written in different languages can
interact with each other.
3

4. Functions of the Common Type
System
 To establish a framework that helps enable cross-language
integration, type safety, and high performance code
execution .
 To provide an object-oriented model that supports the
complete implementation of many programming languages.
 To define rules that languages must follow, which helps
ensure that objects written in different languages can
interact with each other.
4

5. Functions of the Common Type
System
 The CTS also defines the rules that ensures that the data
types of objects written in various languages are able to
interact with each other.
 The CTS also specifies the rules for type visibility and
access to the members of a type, i.e. the CTS establishes
the rules by which assemblies form scope for a type, and
the Common Language Runtime enforces the visibility
rules.
 The CTS defines the rules governing type inheritance,
virtual methods and object lifetime.
 Languages supported by .NET can implement all or some
common data types
5

6. Classification of Types
 The common type system supports two general categories
of types, each of which is further divided into
subcategories:
 Value types
 Value types directly contain their data, and instances of
value types are either allocated on the stack or allocated
inline in a structure. Value types can be built-in
(implemented by the runtime), user-defined, or
enumerations. For a list of built-in value types.
6

7. Classification of Types
 Reference types
 Mr. Sanjay Tejasvee(9251933560) MIT 402: .Net
Framework and Programming in ASP.Net
 Reference types store a reference to the value's memory
address, and are allocated on the heap. Reference types
can be self-describing types, pointer types, or interface
types. The type of a reference type can be determined from
values of self-describing types. Self-describing types are
further
7

8. example shows the difference
between reference types and value
types
class Test
{
static void Main() {
int val1 = 0;
int val2 = val1;
val2 = 123;
Class1 ref1 = new Class1();
Class1 ref2 = ref1;
ref2.Value = 123;
Console.WriteLine("Values: {0}, {1}", val1, val2);
Console.WriteLine("Refs: {0}, {1}", ref1.Value, ref2.Value);
8

9. Queries ????
9

10. 10