How to mark master task complete when all the subtask completed

[razsulthana]

I have created task list 1 (To Create master Task)which would be the master task list and created content type Task which is visible in new button.I created Task list 2(To create sub task) and added lookup coloumn that gets the master task list from task list 1.My requirement is that i need to automate the master task to complete when allits aub tasks are complted else on trying to change the status of master task to complete it shud throw an error message that sub task are not completed.Please reply as soon as possible

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Insert Flash into PowerPoint 2007
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[razsulthana]

I have created task list 1 (To Create master Task)which would be the master task list and created content type Task which is visible in new button.I created Task list 2(To create sub task) and added lookup coloumn that gets the master task list from task list 1.My requirement is that i need to automate the master task to complete when allits sub tasks are complted else on trying to change the status of master task to complete, it shud throw an error message that sub task are not completed.Please reply as soon as possible.

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Programming C#
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