gloss_D

D

Data Adapter Configuration Wizard

A Visual Studio .NET wizard the helps you to configure an ADO.NET DataAdapter component. The wizard helps you select a connection and build SQL statements. Alternatively, you can use existing stored procedures or have the wizard generate the stored procedure code for you.

DataException class

This ADO.NET class is the .NET Framework class that enables you to catch specific types of data access exceptions.

DataRelation object

This ADO.NET object enables you to specify primary key/foreign key relationships between DataTables in the same DataSet.

DataRow object

This ADO.NET object enables you to work with the properties and field values of an individual row of data in a DataTable.

DataRow.RowState property

This ADO.NET property indicates whether the row has been Added, Deleted, Detached, Modified, or is Unchanged, since the data has been added to the DataSet or since the last time AcceptChanges or RejectChanges was called.

DataRowVersion property

This ADO.NET property indicates whether the data in the row consists of Current values (changes that have been made to the data since the data has been added to the DataSet or since the last time AcceptChanges or RejectChanges was called), Original values (the same values as in the database), or Proposed values while an edit operation is pending).

DataSet

This ADO.NET class is a disconnected local data store that can be used by client applications to work with data locally or to easily pass data from one component to another. Data stored in the DataSet is further organized into DataTable and DataRow objects.

DataTable class

This ADO.NET class provides a structure to hold the results of a single query inside the DataSet. A DataSet can hold multiple DataTables.

DataView class

This ADO.NET DataView class enables your application to create different ways to view the data in a DataSet, without changing the underlying data and without having to make additional queries to the database server. The DataView class has Sort, Filter, and RowFilter properties that can be used to create the alternative views of the data. The DataView class has a Find method to search the data.

DataViewManager class

This ADO.NET class provides a single object that can be used to make property settings, such as setting the Sort or Filter property, for any of the DataView objects associated with a DataSet.

DeactivateOnReturn property

A property of the System.EnterpriseServices.ContextUtil class, this indicates whether the object has completed all of its work in the transaction.

Debug class

A member of the System.Diagnostics namespace, this class provides information to the developer during development and testing.

DEBUG compiler directive

In order for debug code to be included in your compiled executables, the DEBUG compiler directive must be set to True before compiling your application.

Debug configuration

Visual Studio .NET enables you to choose either a Debug or Release build for your application. The Debug configuration creates a .pdb (program database) file that contains what are called debugging symbols for your executable. This file is found in the project’s \bin directory along with the executable file. A Debug build will also cause extra information to be added to the executable file so that the debugger can do things such as stopping at breakpoints and letting you step through your executing code. Use the Debug configuration when you are developing and testing your application.

declarative

A term describing permissions for code that can be specified declaratively, by applying attributes to assemblies, classes, or methods. Contrast this with imperative techniques, which require that security features are implemented in the application’s source code.

DefaultTraceListener class

The .NET Framework class that is automatically added to the Trace.Listeners collection. This is the mechanism that is responsible for writing to the Visual Studio .NET Output window, by default.

DeleteCommand

This property of the ADO.NET DataAdapter class is one of the three related properties that hold the SQL statements (or stored procedure names) that will be used when the corresponding insert, update, or delete operations must be performed during an update to the database.

DiffGram

An XML representation of the contents of a DataSet. A DiffGram contains additional XML attributes that indicate which of the items in a DataSet have been modified, inserted, or deleted. Following the XML output of the data rows, the DiffGram contains a section of XML that retains the original values of the modified records. The new section of XML output begins with a <diffgr:before> element. If any of the data rows has an error, that information will be noted in another section of the output file starting with a <diffgr:errors> element.

discovery

The process that enables clients to obtain information about which XML Web services are available at a given endpoint (or on a web server).

distributed transactions

Transactional operations that involve more than one component, or perhaps even components running on different servers.

document encoding

Specifies the exact format of XML that will be created in the SOAP message by using a Web Services Description Language (WSDL) document.

Document Type Definition (DTD)

An older system for validating the format of XML data. Although most tools can still validate by using the DTD syntax, XSD is preferred for new development.

dynamic discovery

A process that enables clients to search all the directories on the web server until it locates an available XML Web service. Dynamic discovery is an alternative to static discovery, in which the client has prior knowledge of a specific URL for the web service.