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The important point is not which of these two events call Bind Data, but one of them must or the Grid View will not be updated. When bound using a Data Source ID, the Grid View internally tracks the current Sort Expression and Sort Direction, and those are available through properties with the same names.
When you manually bind the Grid View, this tracking does not occur, so we must implement some mechanism for tracking those values.
If we were using a Template Field instead, the compiler translates the markup in the templates to the appropriate types of controls in the same way as the page markup in parsed.
For this example, the Item Template would be transformed into a Literal control, and the Edit Item Template would be transformed into a Literal control, a Text Box, and a Literal control (the literal controls would include the spacing between the Edit Item Template tags and the Text Box tags).
First, we’ll implement a method to databind the Grid View, which will be called whenever databinding needs to be performed.When the Bound Field is in Edit mode, things are a little different.In that case a Text Box is created and added to the Controls collection for the appropriate cell (and it's the only item added to the Controls collection, so it's Controls).At that point we need to get the new values so we can update the record, which is done slightly differently for the Bound Field and the Template Field.For the Bound Field, we don’t know the ID of the Text Box since it’s autogenerated by the Bound Field, so we obtain a reference to it by getting the first control in the appropriate cell in the edited row.
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We also need force databinding to occur when then page is loaded, which we’ll handle in Page_Load.