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We will use Template Field, whenever we want to define some custom control in the data bound controls like Grid View, Data Grid or Data Repeater.If he clicks edit (or) in the edit mode he can be able to see the Textbox.The following code displays a Data Grid, together with a 'details' view.Note that Is Synchronized With Current Item is set to true so that the details view and currently selected item within the grid will remain synchronised: The 'Person Data' in this case is a Data Table that is constructed in the code-behind.May be you may think why am I using link buttons as we are provided with some command field buttons by Grid View.Secondly if you want to include a custom field (some button or link) in the same column it’s not possible.
By default, when you bind to a Data Grid this occurs when the user finishes editing a row, either by moving focus or hitting Enter.If you look at the documentation for Data Row View you will find that it implements the IEditable Object interface which is the significant factor here.This interface allows you to perform trasnactional changes to your object, i.e.the Text Box which now occupies or cell that is in edit mode), the cell's Column and Row, and from here we can locate the Row. You might think that we can just commit the change in this event handler, however, this is an 'Ending' event, not an 'Ended' event.In other words the value has not yet been written to the row.
If we use proper command names for the buttons like “EDIT”, “DELETE”, “UPDATE”, “CANCEL” these will also trigger the appropriate Grid View Events.