Each control has the following events and properties that are used to validate a form. Validation on a control is triggered when the control loses focus. Cancel Event Args] object as a parameter to the event block, which you can access this by using the in the Validating event, all events that would usually occur after the Validating event are suppressed.Use this event to provide custom validation for any input control, such as a Text Box. In other words, the validating control will retain the focus until the user provides the correct format, even if the user clicks another control such as a button or textbox.
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This may come in the form of simply checking if there is an entry for a field, such as a name or a more complex task such as validating an email address.
Thankfully Win Forms has built in mechanisms to help facilitate data validation.
I.e., the caret will remain in the textbox until the user enters the correct format.
Important: Never attempt to set the Focus of a control in this event because it can cause the script to hang.
Rad Combo Box can be easily validated against the Text of its items. The control cannot be validated by value out of the box. The goal is to allow form submission only if the value of the selected item is an even number.
The combobox is a composite control, its input area being essentially a elements of List Items which have different value / text properties.
Some of these look great, but certainly don't live up to their expectations. As you may now be starting to realize, formatting a User Form to look great is not that hard!
This is a bit like those fantastic looking charts that really tell us nothing.
Each time you select a menu option that shows a User Form (Tool Options) you don't see a multitude of colors thrust at you simply because Excel is used by millions of people all around the world.