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When the user hovers their mouse over this icon a tooltip is instantly displayed with information about the invalid field. While this may sound trivial, it's actually rather useful. It's up to you how you do your validation, it could be as simple as text length constraints or as advanced as regular expressions matching.
You can have as many error providers on a form as you wish, but I can only see a potential use for two.
For more information, see How to: Anchor and Dock Child Controls in a Table Layout Panel Control.
If you need a child control to mimic the default anchoring behavior in other container controls, you can adjust the properties to maintain a constant distance between the control's border and the cell's border.
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The items that are displayed in the list can be shown in one of five different views.
You will find as you tab through the textboxes on the form, that you will get the error icon appearing unless you enter data in the right format.
Hovering the mouse over the error icon will tell you what is wrong and how to fix it.
Any Windows Forms control can be a child of the To set the Cell, Column, Row, Column Span, and Row Span properties at run time, use the Set Cell Position, Set Column, Set Row, Set Column Span, and Set Row Span methods.
To read the Cell, Column, Row, Column Span, and Row Span properties at run time, use the Get Cell Position, Get Column, Get Row, Get Column Span, and Get Row Span methods. The behavior for Top and Bottom anchoring is analogous.
I am trying to create a Validation in a reusable fashion. Error Provider should associate with control passed dynamically and can be set or cleared at run time.