This property is also used to programmatically control which item is being edited. Setting this property to an index of an item in the DataGrid control will enable editing controls for that item in the EditCommandColumn.
The EditItemIndex property is zero based.
To cancel editing, programmatically set this property to -1.
Text is not HTML encoded before it is displayed in the DataGrid control. This makes it possible to embed script within HTML tags in the text. If the values for the control come from user input, be sure to validate the values to reduce security vulnerabilities.