When you display data entry functionality to users, you frequently have to validate the data entered into your form.The Data Grid View class provides a convenient way to perform validation before data is committed to the data store.
This will work even when row headers are not visible.
I would like to manipulate a cell in my Data Grid View when it is validating so that if the user enters a value that is not valid for the database, but is easily converted to valid data, the program will change the value to an appropriate one.
Is there a way to change the dgv cell Style Format and cell Tag from within the Cell Validating event?
I've tried a few things and have searched for answers without luck so far.
When this event is canceled in data-bound mode, the new value is not pushed to the underlying data source.
When this event is canceled in virtual mode, the Cell Value Pushed event will not be raised.I understand that a Cell Validating method is commonly used but I can't seem to get it to capture negative values.I've just tried it but it's not made any difference.I'm using Cell Validated event and showing a message box whenever it inputs an invalid value.However, when I click on the button to open the child window and close it back, the Data Grid View becomes just a white box with a diagonal cross, and a Null Reference Exception shows. If not, what's the best way to validate a value of the cell and which event to put it in?Possible cases: 1) Dont allow to enter duplicate record 2) Dont allow to enter empty record Need to keep in mind: new row or editing row.