C errorprovider validating
You can use a Windows Forms Error Provider component to display an error icon when the user enters invalid data.
You must have at least two controls on the form in order to tab between them and thereby invoke the validation code.
Let's say you have a form with textbox control, textbox1.
Place an errorprovider control on the form (it is not a visible control).
To display the dataset column error, invoke the Set Column Error method of the Error Provider.
You can customize the Error Provider control to set the Blink Rate and Blink Style.
The Error Provider control is quite useful when it comes to user input validation.
EDIT: presently as a work around, I have a method that toggles the "Causes Validation" property on and off. It has to be set on the parent form and suppresses the validating event when a control is losing focus.
You can also display errors that occur in Data Sets.
You need to set the Data Source, Data Member and Container Control properties of the Error Provider control to set the error for a databound control.
Invoking the Set Error method of the Error Provider control displays an error indicator image next to the control specified as the first argument to the the Set Error method.
The string specified in the second argument in the function invocation is displayed as the tooltip when the mouse is moved over the Error indicator.
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I will use the warning errorprovider when the user leaves a text box blank, use a cross or wrong when the user enters incorrect informat (for the Age text box) and a tick icon for when all conditions are satisfied.5.