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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.

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Now practice your newly learned skills on your own and experiment with the error provider control!In a Win Form I'm doing initial validation in the Form. To make the code short only three fields are shown in the code. Text)) Save(sender, e); } } } private bool Is Filled(string s) { if (s ! So before saving data, I want to validate whether all the required fields are filled (Text Boxes) by the user. private void cmb Save_Click(object sender, Event Args e) { if(Is Filled (txt Application Number. = "") { return true; } else { return false; } } private void text Box_Validating(object sender, Cancel Event Args e) { Text Box currenttb = (Text Box)sender; if(currenttb. 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.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.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.