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Since two way binding is not supported for the First Name Text Box, the special code for extracting values is not generated resulting in null being sent back for the First Name property. I just don't understand why using a nested control doesn't work properly.To work around this, you will need to subscribe to the Item Updating event and extract the values yourself: I'm curious to know why the two-way databinding isn't functional for nested controls. In any case, your blog entry helped me solve my problem, so I wanted to say thanks!Original value means that the correct original value was available.Now let’s say we want to hook into the Item Updating event and prevent a user from changing a certain column.When performing two way databinding, Null values and Nullables get changed to string. The way the Form View control handles null values has caused me some grief :-( Consider a Form View bound to an Object Data Source like so: On the other hand, if we try the same thing with the Details View control, the Last Name will still be “null” on update.This Form View behavior can be problematic when we we need the original object and the modified object to perform an update with conflict detection (see LINQ to SQL example below).New value means that the correct value for the column was available.Changed value means that the correct updated value was available.

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).Add a touch of class to every drink with the Titanic ice cube mold, and relive the glorious failure that was the Titanic.Included in this offensively clever ice cube kit are the molds for the Titanic ship itself as well as and the merciless iceberg.When we need to validate something or put restriction before adding or modifying data, at that time we need to use Item Adding or Item Updating Event Handler, here I’ll demonstrate how to access fields of List into event handlers.Example: As per my requirements, I don’t want to add duplicate Name into List.There is a difference between the behaviour of Before and After properties when dealing with document libraries versus when dealing with lists.