Learn how to register an assembly in the GAC.

Learn how to register an assembly in the GAC.

1) Create an assembly key file
Use the sn.exe tool to create a key file: sn -k StrongNameFile.snk
If your path environment variables aren't set, you'll have to go to the C:\Program Files\Microsoft.NET\FrameworkSDK\Bin\ directory to run sn.exe)
The filename "StrongNameFile.snk" can be any name you want.
2) Edit your assembly Now you have to add a tag which will link your assembly key to the assembly:
using System.Reflection;
[assembly:AssemblyKeyFile("StrongNameFile.snk")]
Normally this is done in the utility AssemblyInfo.cs (vb) file.
3)Add your assembly to the GAC
gacutil /i AssemblyFileName.dll
To uninstall this assembly from the GAC, use the command:
gacutil /u AssemblyFileName
4) (Opional) Add your assembly to machine.config
Locate the <assemblies> tag (for web apps,under <configuration>/<system.web>/<compilation>/<compilers>/<assemblies>)
Between the <assemblies> tags, enter:
<add assembly="AssemblyFileName, Version=0.0.0.0, Culture=neutral, PublicKeyToken=5edf592a9c40680c" />
You can get the information for the assembly attribute, by running the gacutil /l command which will return a list of all the assemblies in the GAC. You will have to look for the one you just added and copy the entire line (less the Custom=XXX part at the end).
At this point, you will be able to place this directive in your aspx pages.
<%@Import Namespace="YourNamespace"%>
or, you can set a reference in the Visual Studio IDE as you would with other GAC Assemblies.