In this case, we simply clear any error messages in the error provider.The Name textbox works very similarly but we don’t have quite as elaborate validation logic.
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Let’s assume when we click our save button that we wish to validate the controls and display an icon if there is a problem.
First, add the following code to the Form’s constructor after the Initialize Component method: This is a handy trick to prevent implicit validation of our controls when they lose focus.
You do not have to disable the Form’s Auto Validate property.
However, I prefer to call it explicitly and handle all validation at once since you most likely will take action only if the entire control’s children pass validation. The most important thing to recognize here is how precise you can be with the validation error message in the error provider.
There are 2 code paths for validation failure, and in each case we provide the user with an appropriate error message.
The error provider simply takes a control and a message in the Set Error method and does the rest of the work for you!If the user enters invalid data they’ll see an icon shown in Figure 3.After the validating event returns without being cancelled, meaning we have valid user input, then the validated event will be raised.Now practice your newly learned skills on your own and experiment with the error provider control!To perform any custom validation on the cell or row being edited, you can use the Cell Validating and Row Validation events, respectively.If you want to validate the data cell by cell, the former event is useful where you want to validate the data for the entire row at once then the later event is handy.