Sends a notification that the specified DataSet property is about to change. Rolls back all the changes made to the DataSet since it was created, or since the last time AcceptChanges was called.
Clears all tables and removes all relations, foreign constraints, and tables from the DataSet. Subclasses should override Reset to restore a DataSet to its original state. Gets a value indicating whether Relations property should be persisted. Gets a value indicating whether Tables property should be persisted. Returns a String containing the name of the Component , if any. This method should not be overridden.
Writes the current data for the DataSet using the specified Stream. To write the schema, set the value for the mode parameter to WriteSchema. Writes the current data for the DataSet to the specified file. Writes the current data, and optionally the schema, for the DataSet to the specified file using the specified XmlWriteMode. Writes the current data for the DataSet using the specified TextWriter.
Writes the current data for the DataSet to the specified XmlWriter. Adds an event handler to listen to the Disposed event on the component.
Occurs after the DataSet is initialized. Occurs when a target and source DataRow have the same primary key value, and EnforceConstraints is set to true. For a description of this member, see ContainsListCollection. For a description of this member, see GetList. For a description of this member, see GetSchema. For a description of this member, see ReadXml XmlReader. For a description of this member, see WriteXml XmlWriter. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services.
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Data Assembly: System. Represents an in-memory cache of data. Note Classes inherited from DataSet are not finalized by the garbage collector, because the finalizer has been suppressed in DataSet. Is this page helpful? Yes No. Any additional feedback? Skip Submit. DataSet String. You can locally work with the dataset and after completing all the modification, save back to the database.
In the next chapter, you will learn about DataTables and DataView. Toggle navigation. C Articles. MVC Articles. NET, the runtime metadata 'knows' all there is to know about each object's layout in memory, its field and property definitions, this makes serialization of objects automatically, without having to write code to serialize each field.
The serialized stream might be encoded using XML, or a compact binary representation. The format is decided by the Formatter object that is called. Pluggable formatters allow the developer to serialize objects in with the two supplied formats binary and SOAP or can be created by developers.
Serialization can take place with any stream, not just a FileStream also Serialization makes use of several classes, as follows: Formatter Responsible for writing object data in some specified format to the output stream. This class is also responsible for driving the deserialization operation. It keeps track of objects already 'seen' so that if you ask for the ID of an object, it knows whether to return its existing ID, or generate and remember a new ID.
ObjectManager Keeps track of objects as they are being deserialized. In this way, deserialization can query the ObjectManager to know whether a reference to an object, in the serialized stream, refers to an object that has already been deserialized a backward reference , or to an object that has not yet been deserialized a forward reference. Each of these components is 'Pluggable' - the programmer can provide alternatives. If a class author wishes to take special action when objects of that class are serialized and deserialized, he can choose to implement the ISerializable interface.
This allows full control. For example, the author may define his own, custom SerializationInfo, to describe parts of the object or synthesized fields that capture the object state for serialization.
If a class implements ISerializable, that interface will always be called in preference to default serialization. An important note on deserialization is that we return the fields in the same order in which they are returned from Reflection.
Reflection makes no guarantee that it will follow metadata ordering. This class holds all the data needed to serialize or deserialize an object. Attention please; this class cannot be inherited. This is a collection of DataTables. We use the DataSet type to store many DataTables in a single collection. Conceptually, the DataSet acts as a set of DataTable instances. DataSet simplifies programs that use many DataTables.
To effectively use the DataSet, you will need to have some DataTables handy. We begin by creating some. In this program, we create 2 DataTables. One stores 2 rows of patient information.
And the second stores 2 rows of medication information. Then we add the 2 DataTables to the DataSet instance. Finally we print the XML. Dispose, using DataSet.
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