C maskedtextbox validating

6854933580_2c8b688306_z

Gets a value indicating whether the caller must call an invoke method when making method calls to the control because the caller is on a different thread than the one the control was created on.(Inherited from Control.)Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control.(Inherited from Control.)Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control.

Optionally, invalidates the child controls assigned to the control.(Inherited from Control.)Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control.(Inherited from Control.)Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control.

The user can select the files to open and then double-click them to activate the items and open the files in the application.

The control is displaying items and subitems, you may want to provide functionality when the user right-clicks a subitem.

It displays a list of the files and folders currently selected in the tree.

Each file and folder displays an icon associated with it to help identify the type of file or folder.

Introducción En algunas situaciones se requiere agregar un ítem especial a los controles, como ser en controles del tipo combo, para que el usuario tenga la posibilidad de indicar que no hay un ítem escogido de la lista.

Esto se usa especialmente en circunstancias en donde el campo que representa el combo es opcional, o se quiere inicializar en un ítem que obligue al usuario a elegir un valor de la lista.

Items can also have subitems which contain information that is related to the parent item.Lo importante a remarcar es como el modelo original de datos no es alterado, pudiéndose cargar, si se necesita, un combo simple sin un ítem adicional, se maximiza la reutilización de los métodos separándolos según agregue o no el ítem opcional.Agregar opción usando un Data Table En este caso se usara un datatable cuya estructura será definido en runtime, la clave aquí esta en el método Obtener List Item Opcional() donde se crea la nueva fila en tiempo de diseño.In some cases, you might want to include code that determines whether these features are available, and provide alternate functionality when they are unavailable.These features are provided by the same library that provides the operating system themes feature.Según cual sea el origen de datos cambia la solución que debe aplicarse para agregar este ítem extra opcional de la lista, ya que será el origen de datos donde se agrega la opción especial.

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