To work with .Net commands directly in Command prompt, we 
have to set the path as below:

1)	Right Click on ?My Computer? and go to ?Properties? 
in the Context Menu.
2)	In the system properties, go to Advanced Tab
3)	Click on the Button ?Environment Variables?. In the 
System Variables, double click Path and a popup with Edit 
System Variables will appear. In the variable value: 
include the path as below:
;C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727;C:\Program 
Files\Microsoft Visual Studio 8\SDK\v2.0\Bin

The above paths where the .net tools (sn.exe, gacutil.dll) 
all are found.


To generate Strong Name Key:

Example:

1)	Create an folder GACKey in C:
2)	Open Command Prompt.
3)	Create SN key as below
4)	C:\>sn ?k SampleKey.snk
5)	Now if the key was successfully generated, then 
command like ?key pair written to SampleKey.snk? will be 
displayed.
6)	You can find the key in C:\GACKey\SampleKey.snk

Create an assembly:
	
1)	Open Class file in a project
2)	Include some methods like below:

public string HelloWorld()
 {
        return "Hello World";
 }
3)	Before Class, after importing namespaces, include 
the following assembly info:
using System.Reflection;
[assembly: AssemblyKeyFile("C:\\GACKey\\SampleKey.snk")]
[assembly: AssemblyVersion("1.0.0")]
4)	Build the application as Ctrl+ Shift + B
5)	Dll for the assembly will be created 
as ?App_Code.gb4sj5sd.dll? as the assembly is placed in 
App_Code
C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary 
ASP.NET Files\exassembly\59f52ba2\a8d76ba5

To Install Assembly in GAC using GAC Util component:

1)	Open command prompt
2)	Type the following command:
3)	C:\>gacutil -
I ?C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary 
ASP.NET Files\exassembly\59f52ba2\a8d76ba5
\App_Code.gb4sj5sd.dll?
4)	The above after gacutil ?I is the path where 
assembly dll is created.


Register assembly entry in registry:

1. Click Start - run, then type regedit to open registry;
2. Go to
HEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\Assembly
Folders\;
3. Right click AssemblyFolders, then select new to
create a new key for your assembly(for example: 
MyTestAssembly);
4. Select Modify by right clicking Default, then enter
the location where your dll resides.

Ex: C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary 
ASP.NET Files\exassembly\59f52ba2\a8d76ba5

5. Restart the VS.NET application. (Ctrl + Shift + F5)

6. Add project reference and in .NET Tab reference list, 
you will see the assembly (App_Code.gb4sj5sd i.e.dll name) 
added to GAC. 

7. Create instance to the class in assembly and can access 
its methods.