Windows form validation c

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You need to add an ErrorProvider control to your windows form application. ErrorProvider presents a simple mechanism for indicating to the end user that a control on a form has an error associated with it. If an error description string is specified for the control, an icon appears next to the control.

Next, a dd the click event handler to the Login button as the following c code. Add the validating event handler to the TextBox allows you to check validate the TextBox control. Using c errorprovider check if error through the Validating event handler. To clear error provider c you can call the SetError method, then set value to null. GetError ctl! Show errField. If none of the controls has an error message, the program displays the values entered.

This entry was posted in controls and tagged C , C programming , controls , example , example program , validate field , validate form , Validating event , Windows Forms programming. Bookmark the permalink. Recent Books:. Search for:. NET Framework components" list. Or else, in the example, click the "Browse" button and locate your Validator. Drag the Validator which has been added by the first step, and drop it on the form.

Its property window should be like:. Now we will assume that there are three TextBox es and one Submit button on the form. Configure validation info for the controls. Now, configure txtRePassword for the demo: show the txtRePassword property window. You will surprisingly find an extra category, " Validation ", there:.

You got to the point of using the Validator. Run your form, and when you enter an invalid value in the TextBox , it will show an error message. You click the "Submit" button, it will not close the window while there are still errors. For a full demo, I have got a "register" example for you, please analyse it yourself.

If you have any problems, feel free to contact me. In this section, I want to say more about advanced components programming. It will be a guide to people who are interested in my Validator component and will show the key points of the Validator.

Here, I will assume you that have basic components programming skills, like creating a component class, applying DefaultValue , DefaultEvent , and Browsable attributes, and so on.