RDTA.PickDP.WebExtensions Library Overview

The WebExtensions library contains the Pick Data Provider classes, controls, and components that automate the movement of data between visual components and the back-end database. These components can work with any .NET visual control as well as the controls provided by the Pick Data Provider. The WebExtensions library makes use of the RDTA.PickDP.Connector library to present Pick data using either a record set familiar to hierarchical database programmers or Pick Items which are familiar to Pick programmers.

Key Classes and Controls

Class or Control	Description
connection	Generally placed on the FormMDI to provide access to a Pick Data Provider server. Defines the connection to the server.
ControlBinder	Binds form controls with the data in a table. onProcess events are fired when the data is processed.
DBCombo	Extension of the Forms.ComboBox control. All control items are automatically maintained from the visual4mv environment. The DBComboBox is a collection of connValuePair Objects. Each connValuePair Object represent an Item_Id in the table as internal code and a String with the value of the Item defined as external Value.
DBDataBinder	Placed on a form that uses the Pick Data Provider’s ability to use properties to link visual components to the back-end database. The DBDataBinder supports column and control binding: Column bindings are used for visual components which are aware of cells within columns (DBGrid). Control bindings are used for cells that are not aware of cells within columns.
DBListBox	Extension of the Forms.ListBox control. All control items are automatically maintained from the visual4mv environment. The DBListBox is a collection of connValuePair Objects. Each connValuePair Object represents an Item_Id in the table as internal code and a String with the value of the Item defined as external Value.
SharedObjects	Used by generated code to open/close connections, and to set table’s connections and open/close tables.
table	Placed on a form that needs to access a database table. Defines a table accessed through a connection.

Object Reference Model

Class Inheritance Model

The RDTA.PickDP.WebExtensions library includes these classes, controls, and interfaces:

Classes

connItemCancelEvent	Event handler for the connItem Object.
connItemEvent	Creates a new event handler for the connItem Object.
ControlBinder	Binds form controls with the data in a table. onProcess events are fired when the data is processed.
lockType	Enumerates the different lock types.
reflection	Used by Pick Data Provider templates to open the connections and tables associated with the form.
SharedConnection	Stores information about a connection that is stored in a shared object.
SharedObjects	Used by generated code to open/close connections, and to set table’s connections and open/close tables.
TableConverter	Provides a unified method for converting types of values to other types, as well as for accessing standard values and subproperties.
TableDataBoundDesigner	Extends the design mode behavior of a Web server control.
WebConnections	For internal use only.

Controls

connection	Defines the connection to the database server.
DBCombo	Extension of the Forms.ComboBox control. All control items are automatically maintained from the visual4mv environment. The DBComboBox is a collection of connValuePair Objects. Each connValuePair Object represent an Item_Id in the table as internal code and a String with the value of the Item defined as external Value.
DBDataBinder	Binds the fields in a table to the controls in a form.
DBListBox	Extension of the Forms.ListBox control. All control items are automatically maintained from the visual4mv environment. The DBListBox is a collection of connValuePair Objects. Each connValuePair Object represents an Item_Id in the table as internal code and a String with the value of the Item defined as external Value.
table	Represents a single table in a database.

table.connItemCancelEventHandler	Defines the delegate and registration point for processing connItemCancelEvents.
table.connItemEventHandler	Defines the delegate and registration point for processing connItemEvents.