step 1: create the .NET project and build it
Step 2: Sign and rebuild
Step 3: Deploy to the GAC global assembly Cache use GACUTIL located at c:\windows\system32
Step 4: when to deploy to Target SSIS machine, try drag and drop the DLL into c:\windows\assembly or if it's .Net 4 in C:\Windows\Microsoft.NET\assembly\****\
Reference article: http://microsoft-ssis.blogspot.ca/2011/05/referencing-custom-assembly-inside.html#comment-form
