Global Assembly Cache

Each computer where the common language runtime is installed has a machine-wide code cache called the global assembly cache. The global assembly cache stores assemblies specifically designated to be shared by several applications on the computer.

There are two ways to deploy an assembly into the global assembly cache:

• Use an installer designed to work with the global assembly cache. This is the preferred option for installing assemblies into the global assembly cache.
  
• Use a developer tool called the Global Assembly Cache tool (Gacutil.exe), provided by the Windows Software Development Kit (SDK).

Assemblies deployed in the global assembly cache must have a strong name. When an assembly is added to the global assembly cache, integrity checks are performed on all files that make up the assembly. The cache performs these integrity checks to ensure that an assembly has not been tampered with, for example, when a file has changed but the manifest does not reflect the change.

A strong name consists of the assembly's identity—its simple text name, version number, and culture information (if provided)—plus a public key and a digital signature. It is generated from an assembly file (the file that contains the assembly manifest, which in turn contains the names and hashes of all the files that make up the assembly), using the corresponding private key.

Constructors in C#

A constructor is a class default method that gets automatically executed whenever class’s object is created or whenever class is initialized.

Consider this example
public class demo
{
public demo ()
{
//A default Constructor
}
//Class members
}