Errorprovider validating

Posted by / 30-Mar-2020 22:33

Errorprovider validating

Built-in validation doesn't go much further than an enforcable maximum length for textboxes, but there are some nice methods you can use to make validation a breeze.

You can use a Windows Forms Error Provider component to display an error icon when the user enters invalid data.The Error Provider component displays an error icon () next to the relevant control, such as a text box; when the user positions the mouse pointer over the error icon, a Tool Tip appears, showing the error message string.The Error Provider component's key properties are Data Source, Container Control, and Icon.The last thing we need is for a Message Box to pop up when we tab away from a field, telling us it's invalid. Also, we don't want all the validation done when the user presses the OK button, because they could then potentially be given a great big message with all the fields that are wrong.So what we need is a method of unobtrusively showing that data is invalid, and presenting it in such a way that it is immediately obvious what is wrong and what to do about it.

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Note If you change the error provider's Data Source and Data Member properties at run time, you should use the Bind To Data And Errors method to avoid conflicts.