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You can think of an item event receiver like a database trigger: it has different events that fire during the course of Share Point running an operation on a list item (or document item).
Item Event Receivers derive from the SPItem Event Receiver class and have a number of methods that can be overridden to respond to various events: As you look through this list, you should notice that events have two types of endings: WARNING: One major gotcha you should know about the SPItem Event Receiver class is that while you can implement multiple list item event handlers in a single class, Share Point instantiates a new instance of that class for each individual event it needs to handle.
Sometimes that is the most exciting way to learn, but for those less adventurous I will briefly cover the topic here.SPField Lookup Value old Lookup Value = new SPField Lookup Value(properties. To String()); SPField Lookup Value new Lookup Value = new SPField Lookup Value(properties. When dealing with event receivers in Share Point custom code, we use the Before Properties and After Properties to get a hash table of properties consisting of string/value pairs that correspond to fields in the SPItem object before and after the event occurred respectively.This is to summarize the inconsistent behaviors I encountered when working with "After Properties" in "Item Updating" event handler on a custom Share Point list in SP 2010.1) After Properties will be NULL when Item Updating event is called because of a code-update to list: But, when the list is being updated by code, and the code does not update the "Email" (for example, the code just updates "First Name" in the list) then properties. To String() will have the correct look up value like "3;#karthik", but the value of properties. To String() will have only "3" (just the look up ID).