C combobox validating

26-Sep-2016 09:28 by 10 Comments

C combobox validating - Free fucking siyes aus no membership

The following code example uses the derived class Text Box and validates an e-mail address that the user enters.

First you're using string values and are basing logic on these values, you might want to look into using an Enum and binding all it's values to the combo box.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.The validated event works the same, only pass it the name textbox instead.Here is just the validating event handler’s code: The event driven validation model in Win Forms is powerful and flexible enough to allow you to create high quality apps that implement robust and maintainable validation code in your forms.This example requires that a Text Box and Error Provider control have been created on a form.

I have 6 combo boxes in c# form that all fill from database from same column.

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!

Hello: Using Win Forms, certain users may change the value in a combobox, others may not. I need to check the user's rights before committing his or her changes in the box and restore the previous value if he or she is not allowed (or not let the value be changed in the first place). Ken Using Win Forms, certain users may change the value in a combobox,others may not. I need to check the user's rights before committing his or herchanges in the box and restore the previous value if he or she is notallowed (or not let the value be changed in the first place). Now the only thing I need to be able to do is reset the original value and allow the user to continue.

There are 2 code paths for validation failure, and in each case we provide the user with an appropriate error message.

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