This section contains information about user-defined functions (UDFs) and how to use UDF attributes in your code.
Learn about managed-code UDFs, including required attributes, deployment, and security.
Get step-by-step instructions on developing Excel Services UDFs using Microsoft Visual C#.
Find answers to the most common questions about Excel Services UDFs.
Learn how to enable UDFs and allow them to be called from an Excel workbook.
Learn how to call an external Web service from a UDF.
Get an example showing how to access an external database from a UDF.
Learn how to deploy a UDF by using the Windows SharePoint Services solution framework.
Learn how to create a custom code group and restrict permission for a UDF assembly by using the .NET Framework 2.0 Configuration tool.
Excel Services UDF attributes.