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The Grid View and Details View controls offer built-in editing functionality that can be turned on with the tick of a checkbox.
Namely, each field in the Grid View or Details View is rendered in its editing interface; Bound Fields display a Text Box control while Check Box Fields display an enabled checkbox.
This article provides a comprehensive solution for defining an edit template in a Form View. The Form View is a binding control like the Grid View, except where the Grid View shows multiple rows of data and the Form View shows one record at a time in a form layout.
The edit template contains a Drop Down List and the population, binding, and updating is all handled declaratively. After you complete the data source wizard the Form View will have controls added to it for the Item Template, Edit Item Template, and Insert Item Template.
It is the Edit Item Template you are interested in.
The Edit Item Template will contain Text Box controls by default.