What?
This article is so that I don't spend so long in googling what the TxScript referenced assembly is when creating an SSIS custom component.

How?
This is simply the "Script Component" under "Extensions". No MSDN website said this... obvious to Microsoft staff so why should their documentation include it?


Workaround (applies for any dll)

1. You right-click on the "references" folder,
2. Select "Add Reference..."
3. Click on "Browse..."
4. Navigate to C:\Windows\assembly
5. Select the TxScript one in "GAC_MSIL\Microsoft.SqlServer.TxScript\10.0.0.0__\Microsoft.SqlServer.TxScript.dll"
6. Select the dll and click on "Add"

Related Error(s):

• The type or namespace name 'SSISScriptComponentEntryPointAttribute' does not exist in the namespace 'Microsoft.SqlServer.Dts.Pipeline'