How to create a SqlCommand Object in ADO.Net?
SqlCommand cmd = new SqlCommand("select CategoryName from Categories", conn);
Above syntax is written to instantiating a SqlCommand object. It takes a string parameter that holds the command you want to execute and a reference to a SqlConnection object.
Define ADO.NET Objects in brief?
ADO.net includes many objects you can use to work with data. Some of the primary objects are:
1. The SqlConnection Object
2. The SqlCommand Object
3. The SqlDataReader Object
4. The DataSet Object
5. The SqlDataAdapter Object Reply
How to DataBindings for TextBoxes in ADO.Net?
To bind some elements of a data source with some graphical elements of an application, this ability known as DataBinding. The data in Windows Forms is bound by calling DataBindings. Windows Forms allows you to bind easily to almost any structure that contains data.
Windows Forms Controls support two types of data binding:
a.Simple Data Binding: To display a single data element, means to display a column value from a DataSet table, in a control. It is possible to bind any property of a control to a given data value. Simple Data Binding can be performedby two ways:
1.At design time using DataBindings property of a control
2.Dynamically at run time. This is the type of binding typical for controls such as a TextBox control or Label control that displays typically only a single value.
b.Complex Data Binding: To bind more than one data element, typically more than one record in a database, or to more than one of any other type of bindable data element. DataGrid, ListBox and ErrorProvider controls support complex data binding.
Define methods of DataAdapter in ADO.Net?
The DataAdapter includes three main methods:
1.Fill (populates a DataSet with data).
2.FillSchema (queries the database for schema information that is necessary to update).
3.Update (to change the database, DataAdapter calls the DeleteCommand, the InsertCommand and the UpdateCommand properties).
Define DataAdapter in ADO.Net?
DataAdapter object is links the database and a Connection object with the ADO.NET-managedDataSet object through its SELECT and action query Commands. Means it works like a bridge DataAdapter specified that which data is to move into and out of the DataSet. DataAdapter provide references to SQL statements or stored procedures that are invoked to read or write to a database.
The DataAdapter provides four properties that allow us to control how updates are made to the server:
Define the ways to populate a Dataset in ADO.Net?
There are following way to populate Dataset:
a.By using DataAdapter objects and Fill method.
b.By creating DataTable, DataColumn and DataRow objects programmatically.
c.Read an XML document or stream into the DataSet.
d.Merge (copy) the contents of another DataSet, with the Merge method.
Define types of Datasets in ADO.Net?
There are two type of dataset in Ado.net:
1.Typed DataSet: Typed DataSet is derived from the base DataSet class and then uses information in an XML Schema file (.xsd file) in order to generate a new class.
Create a typed DataSet without designer - manually
a.Call the command prompt (cmd) at the location of the XSD schema file.
b.Use the XSD.EXE utility to create the class for the typed DataSet.
2.Untyped DataSet : Untyped DataSet is not defined by a schema, instead, you have to add tables, columns and other elements to it yourself, either by setting properties at design time or by adding them at run time.
Define Dataset in ADO.Net?
1.Disconnected Recordset objects similar to an array.
2.Supports disconnected data access and operations.
3.Scalability, Provide greater scalability because users no longer have to be connected to the database all the time.
DataSet object is made up of two objects:
1.DataTableCollection object containing null or multiple DataTable objects
2.DataRelationCollection object containing null or multiple DataRelation objects which establish a parent/child relation between two DataTable objects.
Define Data Provider in ADO.NET?
Data Provider is a set of components including:
1.The Connection object (SqlConnection, OleDbConnection, OdbcConnection, OracleConnection)
2.The Command object (SqlCommand, OleDbCommand, OdbcCommand, OracleCommand)
3.The DataReader object (SqlDataReader, OleDbDataReader, OdbcDataReader, OracleDataReader)
4.The DataAdapter object (SqlDataAdapter, OleDbDataAdapter, OdbcDataAdapter, OracleDataAdapter).
DataSet object represents a disconnected cache of data which is made up of DataTables and DataRelations that represent the result of the command.
Tell me about ADO.NET Classes?
The ADO.NET classes are found in System.Data.dll and are integrated with the XML classes in System.Xml.dll. ADO.NET is a set of classes that expose data access services to the .NET developer. There are two central components of ADO.NET classes: the DataSet, and the .NET Framework Data Provider.Reply