Normally, the Error Text will be cleared after the user corrects the value.
Sometimes the user will just press Esc key to cancel the input value, in this case the Cell Validating event won't get fired and the Error Text will remain shown on the Row Header Column. We often have many columns to be shown in the grid and the user can use horizontal scroll bar to scroll to the region (s)he likes.
thankxxxxxx There are two ways to manage unwanted execution of event handlers.
1) Add a conditional statement in the event handler code to only execute when required.
event, value calculates when I leave the next cell.
To make it more clear when I press Enter for the second time.
Now, since so many books use the Cell Validating event, I wonder if there is not any gotcha (in display for example) with using the Cell Value Changed?
Hi there, I have a question regarding datagridview, I add data to the datagridview in an interface and all the validation for the datagridview cell is in the datagridview cell validating event for the datagridview.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.2) Detach the event hander before the unwanted event triggers and re-attach after.There are two ways to manage unwanted execution of event handlers. Data Grid View Cell Validating Event Args' does not contain a constructor that takes '1' arguments" what is the solution for this???????In general, it is better to use the Cell Parsing event whenever you need to convert/change the value in a cell.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.And the Error Text tooltip won't be shown as we described in the 2nd issues. Cell Validating event occurs only when a cell value is changed. In case when Esc is pressed, the value remains the same and no validation is needed. If no text is entered in the these columns the Cell End Edit is not fired, and obviously as you stated, the Cell Validating is not either.In case when Esc is pressed, the value remains the same and no validation is needed. However, you can handle Cell End Edit event in this case and reset the Error Text property. Even if I click in the cells and click out the Cell End Edit is not fired, so I am unable to update the Error Text.For example, this event triggers everytimes the users switches to another row.On the other hand, the Cell Value Changed event seems to trigger only when the value of the cell changes, which means the validation code runs only when the value changes and not everytime a user changes cells.I display the data of the is datagridview in another interface and make the cells read-only. But the thing is when I click on a row that data was added previously and press the Add new row the cell validating event is triggered.How can I disable the cell validating event for the rows that was added before???Something there is causing the cell validating event to fire. [Edit] The validating event is firing because focus is being moved from the DGV to the button.