(You can set the error to the control by name, or generically by using the sender argument. If the input is not valid, we set the error shown by the ErrorProvider (the e.Message is generally the same as the Message parameter of any exception that has been thrown). We also clear any errors in the ErrorProvider (not sure of the best way to use this control, but this works). In your case, it seems that youd rather let them navigate away but display an error icon. If the control fails validation then you can set e.Cancel to True and the user will not be able to navigate away from that control until they fix it. In that event handler, we check if the input is valid (don't know what all that does, but it works - play with it) and, if so, cast the value to the correct data type in order to use for some purpose. Validation of WinForms controls should generally be done in the Validating event handler of that control. uia2atk / UIAutomationWinforms / UIAutomationWinforms / / ErrorProvider.cs / Jump to. The example shows us setting the type of data which should be entered into the text box and then subscribing to the corresponding event. It's really useful when combined with the above data validation method. The ErrorProvider is a WinForms control that allows you to show a red exclamation mark with an error message tooltip next to a control. When the mask is blank, you can accept input just like you can with a TextBox. What you should be aware of, though, is that the Mask is *not* required. To be able to show model errors in DataGridView or showing errors using ErrorProvider the model which you are using in data binding should implement IDataErrorInfo.
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