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Today End Sub End Class Public Class Courses Inherits Observable Collection(Of Course) Sub New() Me. Memberwise Clone(), Course) End Sub Public Sub Cancel Edit() Implements IEditable Object.

How am i supposed to edit the code so that it does not generate this error?In case someone else is still searching nowadays: The solution that worked for me was to re-assign the (same) Data Source to the Data Grid View, and call the Refresh method on the grid after having set the Row Error properties. Net code:) I believe that the errors will only show on editing.What you could do is add a bool column to your Data Table, which drives the display of an image/custom column in the Data Grid View, reflecting whether there is an error or not.column, its value is tested for validity by checking that it is not empty. If the event handler for the Cell Validating event finds that the value is an empty string, the Data Grid View prevents the user from exiting the cell until a non-empty string is entered.