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The set Error method sets the error description string for the specified control.If the user hovers the mouse over the error icon then it shows an error description string that we have declared in the set Error() method.Let's say you have a form with textbox control, textbox1.Place an errorprovider control on the form (it is not a visible control).However, if the user doesn't edit in any textbox on the form and click the Save button directly, the textbox's Validating event won't be raised.The only way I've found to do | this is to cycle through every control and call it's .You will choose which event to handle based on the order in which the events are fired and the information passed in the event argument of the event handler.The Key Press event happens after the Key Down event but before the Key Up event.

In the following tutorial we will demonstrate how use validation panel together with Error provider.When designing an application that interacts with the user to accept data, you must ensure that the entered data is acceptable to the application.The most obvious time to ensure the validity of data is at the time of data entry itself.EDIT: presently as a work around, I have a method that toggles the "Causes Validation" property on and off.I default everything to not Cause Validation, enables them all before I use the event for validating the whole form, and disables them all after again.