Datatable rowstate not updating
Execute Scalar is useful for returning a single value from the database. This namespace also defines interfaces that are base classes for the data provider classes. Similar to other objects, each data provider has a command builder class.For example, using this method we can retrieve a sum of sales made by a specific product, total number of records in the employee table, unique id by supplying filtering conditions and so on. The Ole Db Command Builder, Sql Common Builder, and Odbc Command Builder classes represent the Common Builder object in the Ole Db, Sql, and ODBC data providers.Simply, the Execute Non Query is for executing the DML statements. You can work on connected and disconnected In disconnected model you will get old data as you are editing it. We work on offline object model and when connection is required it is connected. For example, Answer : A Connection object sits between a data source and a Data Adapter (via Command).The return value of the Execute Non Query is an integral value that represents the number of rows affected by the Operation. Connected object can be used on disconnected object. NET allows you to manipulate your data using XML as the primary means. The developer has the freedom of choice in internet development, for creating efficient applications. Some of the provider-specific namespaces are System. You need to define a data provider and a data source when you create a connection. NET components categorized in three modes: disconnected, common or shared and the . Shared or common components are the base classes for data providers and shared by all data providers. NET applications for data source communication using a driver or provider: Answer 2: ADO. For example, you can use a Data Table object with or without providers and shared or common components are the base classes for data providers.
If you create and drop your objects within each method, this isn’t going to be a problem, and you are actually following a better guideline by creating at the last necessary moment, and destroying at the first possible moment, not to mention avoiding possible exceptions like Invalid Reference Exception.
We should iterate through this object to get the required values. NET provides objects that allow you to access data in various ways. Data Adapters form the bridge between a data source and a dataset. Figure: The relationship between connection, data Adapter, and a data source.