We use MIIS and custom extension dll written by other company. I would like to map extension rule to correnpondent VB.net written Function? or Class? if possible. How can I know that ?

This should provide all answers you may need :) http://msdn.microsoft.com/en-us/library/windows/desktop/ms696509(v=vs.85).aspx

Do you want to convert C# to vb.net? I don't think i understand your question fully but if you want to convert check this link: http://www.developerfusion.com/tools/convert/csharp-to-vb/Need realtime FIM synchronization and advanced reporting? check out the new http://www.imsequencer.com that supports FIM 2010, Omada Identity Manager, SQL, File, AD or Powershell real time synchronization!

Is your current extension written in C# and you want use a function written in VB? Probably easier just to convert it to C#. There are actually 3rd party solutions that can do that with but it may cost you more than its worth. Maybe a good time to learn the syntax differences. Maybe you can post it and someone will be nice enough to convert it for you JPaul N Smith

thank you very much. MIIS extension is written by VB.net and I would like to understand the what the rule extension do. And also ,in the futue I have to migrate MIIS to FIM(FIM is other server and already exists in AD).

Right you want to understand the code, then the link Tomasz provided is a good starting point to identify which functions are necessary for MIIS to function, i think the most logic will be in MapAttributesForImport and MapAttributesForExport, within here the mapping between the attributes is done and mostly the most code is writen. If you can post your code we can explain what the code is doing if that is going to help you. You can transfer the management agent and code to FIM without making any major changes. Need realtime FIM synchronization and advanced reporting? check out the new http://www.imsequencer.com that supports FIM 2010, Omada Identity Manager, SQL, File, AD or Powershell real time synchronization!