Steps for Giving strong name to DLL
1.)Open .net command prompt.
2.)Go to the folder contanig DLL.
3.)Type sn -k test.snk, you can use any file name instead of test. This will create test .snk file in that folder.
4.)Open the assemblyinfo.cs file of project.
5.)Type file path in this tag [assembly:AssemblyKeyFile@"E:\hemant\practice\HP\bin\Debug\HP.snk")]
6.)Build application, finally your strong name created for your DLL.