In the above diagram,we have two application Applictaion1 and Application2 sharing a DLL Called SharedDLL.Both Application invokes a common function called SharedHello(Does not return and takes no parameter).

Let’s Assume Application2 want’s a parameter to be passed to SharedHello,so Now  the sharedhello takes one parameter as string,and the reference to SharedDLL is updated by Application2. This change in reference to DLL would not make the Application1  working,as Applictaion1 sharedhello takes no argument.

The above situation is called DLL HELL.(The compatibility issues between the DLL.) 

When generating Strongly Named Key,the Public Key and Private Key are generated to sign the Assembly.However,you can also create partial key,i.e you can have the public key generated and reserve the private key to be generated latter time.This is called Delayed or Partial Key.You can still deploy the partially signed assembly in GAC. 

A Strongly Named Assembly  allows assembly to share with multiple application(Assembly which contains Strong Name Key are qualified as Strongly Named Assembly).These are generally put into GAC.They are also called as Shared Assembly.  

Assemblies that are used only by one application.They are generally stored in Application Folder or Sub directory.They are of private type and cannot be shared.They are also called Private Assembly.They cannot be deployed in GAC.

To Create Strongly Named Assemblies,You must create Strong Name Key For that Assembly:

Steps to create Strong Name Key:

1.SN -k  yourkeyName.snk. The Key Contains both public and private key.(Keys are generated by Hashing Technique)

2.Attach the the Generated Strong Name to your application(From Visual Studio->Properties->Signing).

Generated below is the Publickey of SNK.you cannot view the Private key . 

MetaData reside in Assembly and They are nothing more than list of tables which holds information about your managed modules(TypeDef,Parameterts,Module,AssemblyVersion,MethDef etc..).These tables are in turn use by CLR to execute the program. 

Listed Below,MetaData Info of Exe using ILDASM.

Struct:

1.It is a value Type.Reside in Stack

2.It will not support Inheritance.

3.They are suitable when you hold small data.

Class:

1.It is a Reference Type-Reside in Heap.

2.They will support Inheritance.