A while back I was having a problem with getting events to fire from a drop down list inside a repeater.  In that case, I turned off ViewState for the Repeater control, and everything worked fine after that.  Well, last week I came upon a situation (much to complicated to go into here) where that just wouldn't work.  I needed the ViewState to be on, and knew there should be a reasonable way to make it work.  To make a (much too) long story short, after talking it through with Leo I discovered the error of my ways.  I was populating the items inside the drop down list during the Repeater's ItemCreated event.  Apparently that's bad.  I took exactly the same code and moved it to the handler for ItemDataBound, and everyone was happy.  Now I can leave ViewState on, correctly populate the items in the list, and actully get the SelectedIndexChanged event properly fired from each and every DropDownList. 

It's the little things...