Question: I would like to create workflow using SDL Tridion 2011 SP1, and i am going through the documentation in the live content portal.

I have few questions when I go through the documentation as follows:

1. Can I use **C# (TOM.NET)** for automatted activities/decisions? or should I use only **VBScript (TOM)**? Is there any sample code given in the live content portal for automatted activity/decision?
2. If **C# (TOM.NET)** is not allowed to use in workflows, why are its namespace/class/member references given there in TOM.NET API file?
3. If VBScript only allowed to use in WF, where can I get code/TOM API reference in SDL live content? As of now I dont have access to SDL Tridion server to get the documentation from the installer package.

Answer: 
Can I use C# (TOM.NET) for automated activities? Or should I use only VBScript (TOM)?
-------------------------------------------------------------------------------------

You can use the TOM within your C# code to write automated activities. There is a primary interop assembly provided for that purpose (IIRC).

Is use of TOM.NET allowed in workflows?
---------------------------------------

Accessing workflow items from within existing TOM.NET code (i.e. a TBB or DataExtender) is supported. So you can query items that are in workflow, kick off workflows, etc.. But using the **TOM.NET for writing automated workflow activities is not supported**. 

The reason for this has something to do with incompatible threading models from what I recall. But I mostly just took the word of the developers for it; they are bound to know better than me.

Where can I get code/TOM API reference?
---------------------------------------

API reference documentation for Tridion is not in LiveContent, but instead is delivered in CHM (or zipped JavaDoc) files. The latest documentation for the TOM API can be found in the "SDL Tridion 2009 full documentation" zip on the [Tridion 2009 documentation page on SDL Tridion World](https://www.sdltridionworld.com/Login.aspx?ReturnUrl=/downloads/documentation/SDLTridion2009/index.aspx) (login required).

Thanks to Quirijn and Alvin for pointing this out in the comments.
1. Create the workflow diagram (based on the requirement) using visio after installing the visio plugin.
2. upload the workflow into SDL Content Manager by providing the credentials and choosing the relevant publication.
3. For automatted activities: create a c# class library and refer the tridion dll's, and user progid and comvisible = true in the solution.
4. create the necessary functions for your workflow.
5. register the assembly in the SDL Tridion Content Manager server.
6. in the workflow "Edit script" use vb script code to get the C# object and its methods.
7. This will simplify the VBScript code and provide flexibility to the developr to work in c#.