C validating canceleventargs
So before saving data, I want to validate whether all the required fields are filled (Text Boxes) by the user. In my windows form projects , i have validated the fields using Boolean method.
Find the below sample screen shot for validating the fields before saving the data Img 3: Validation method Here I have validated the fields using the Boolean method, If all the field values are entered properly it will return true, other wise it will return false and will display an error message.
I have set the mask to 9,999.00 but the user input looks like this 0,0__.__ instead of this $___._12.00.
It seems like the maskedtextbox would be able to handle this type of input without using the keypress events to alter the text. NET Video Tutorials | Login Form using backend database (. NET | Encrypt/Decrypt data in SQL Server 2005 using SQL statements | Writing Managed Stored Procedures in SQL Server 2005 | FREE . NET using Visual Basic 2010 Express.) If the user manually entered a "$" into the textbox there an unhandled exception would result.
Description: An exception occurred while processing your request.
After the validating event returns without being cancelled, meaning we have valid user input, then the validated event will be raised.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.For example, you could display an error message, change the field’s background color, or at least beep to let the user know that focus did not leave the field because something is wrong. The event triggers even if the user tries to close the form.That means the user cannot close the form unless the field passes validation.