Just compile the accompanied source in release mode, browse and add it to your VS.NET IDE ToolBox, drop it on the form, and you are ready to visually design your input validations. You don't have to write a single line of code. ValidationProvider makes it easy to setup validation for TextBox and ComboBox controls. Of course, if you wish to drill down on the details, all the source codes are provided. I'll stop here before I go too far off from the topic. Noogen ValidationProvider also tests and validates regular expressions and can even wire more advance custom validations.My second goal is to provide easy wiring of basic/familiar validations as seen in WebForm, which includes: DataTypes check, required field, range and value comparison validations, and more.To speed up development, Noogen ValidationProvider re-uses WebForm validator base engine and displays error using ErrorProvider Control (hence the name ValidationProvider).My goal with Noogen ValidationProvider is to bring all these great ideas together and simplify them. I know that this topic has been discussed many times (example MSDN article - Extending Windows Forms with a Custom Validation Component Library, Part 3), but most of the articles I've seen are either too restricted to a single control ( TextBox) or too complicated. Kohli - How To Use The ErrorProvider Object To Indicate Invalid Control State. Noogen ValidationProvider is also built on ErrorProvider, see the article by Naveen K. This is because ValidationProvider engine is derived from WebForm Validators base. Backgroundįor the beginners, I would suggest a reading of Paul Riley's article on Validators in ASP.NET/WebForms - ASP.NET Validators Unclouded. Use the ErrorProvider to display an error icon next to the invalid control, similar to the method above.Do you spend most of your time writing custom validations on Windows Forms? Have you ever wanted an equivalent WinForm validator like in WebForm? Noogen ValidationProvider can help you speed up your WinForms design time by providing powerful, easy and virtually code-free wiring of input validations.This is more “web-like” where the actual full validation is executed on save but you show the invalid state. But you can set the control to Invalid and set the InvalidMessage. Cancel the Validating event: Wisej will force (it may fail if you keep clicking due to timing issues :)) the invalid control to gain the focus back, it will automatically set the Invalid property to true and you may optionally set the InvalidMessage tooltip.That’s why we also added the InvalidMessage and Invalid property as well as the ErrorProvider component.īasically with Wisej you can validate in 3 different ways (this will be a new topic in the docs): I haven’t tried it yet.īut about the validation in general, we can’t block the cursor from changing the focus, otherwise you’d have to wait for a server request/response everytime the user tabs around. The cursor always stays in CustomerID if it is invalid. I also includes a DataGridView to show how CellValidating event works. I am attaching the revised test project that shows the value of the Invalid property everytime the Validating event is fired. The test project I sent you is using the ErrorProvider to notify the user of invalid data. Use the ErrorProvider to display an error icon next to the invalid control, similar to the method above This approach will resolve the problem as cancelling the event is very restrictive to the user and this is what I follow in a real-world application and revalidate all or invalid controls before saving. I believe that it should fire everytime the textbox loses focus.ĭo not cancel the Validating event. Also, I concentrated on mouse click when I sent you the test project. But now, when I tried using Tab to go from one control to another, the Validating event doesn’t always fire. But still, I was able to make an entry into the next textbox even if the previous textbox hasn’t passed the validation yet. I agree with you about the request/response in a web app but in the sample I sent yesterday, I am cancelling the Validating event by setting e.Cancel to true. Cancel the Validating event: Wisej will force (it may fail if you keep clicking due to timing issues :)) the invalid control to gain the focus back, it will automatically set the Invalid property to true and you may optionally set the InvalidMessage tooltip.
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