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Cellvalidating in datagridview in c

I am able to validate my value properly but when I try to change it to something valid I get a Data Error. You should never attempt to change the cell value in the handler for this event, because unless you cancel the event (in which case the user is stuck in edit mode), the cell value is set to the value from the editing control immediately after the event finishes.This, therefore, undoes any action you perform in the handler.

But I also need to perform the task when the user ordinarily ends edit mode without having changed anything.When Row Headers are not visible: In that case, validation still works however error message and icon will not get displayed.Use this approach with Cell End Edit even to get more control.EDIT The biggest thing about the Cell Validating event is that you can stop the user from leaving a cell, if the value entered does not pass your validation. column, its value is tested for validity by checking that it is not empty. Data Grid View Cell Validating Event Handler Data Grid View Cell Validating Event Args Cell Validated Data Grid View Cell On Cell Validating Data Grid View Class System.

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.

From within that event, you can indicate that the user's value is invalid by setting the Error Text value of the cell or row.

I have a Data Grid View that is sourced from a datatable.

I'm trying to stop the user inputting non-numerical or negative integers or doubles into different columns from the datagridview.

I understand that a Cell Validating method is commonly used but I can't seem to get it to capture negative values.

I used this event because I wanted to fire off a certain order of events, but only when the user changes the value of a cell.