ASP.NET Professional Projects by Harsh Bhasin

By Harsh Bhasin

This ebook deals intermediate to complicated IT pros the opportunity to profit the internal workings of latest SOAP/XML advancements through operating via a real-life program. Readers will layout an accounting product for the internet utilizing ASP .NET and internet companies. the appliance could be written in any .NET language and all communique is over the net. Readers will stroll away feeling convinced approximately constructing real-life initiatives utilizing ASP .NET

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Sample text

The command object is constructed by providing a SQL query and a connection object as parameters to the command object. Close() CommandType The command object has a property called CommandType that is used to define the type of command being sent to the database. There are three CommandTypes available. These are the Text, StoredProcedure, and TableDirect types. The Text CommandType is the default. This is a string of SQL text that is issued to the database as in the following example (I did not explicitly specify the CommandType in this example, as it is the default): sql = "delete from masters where code_display = 'test'" Dim mycommand As New OleDbCommand(sql,myConnection) The StoredProcedure CommandType is used to execute a database-stored procedure.

If you reflect on ADO, and how it evolved over time, you will realize that it was a child of the client-server era. It was steeped in the connection-based method of handling data. A typical database access operation would open a database connection and leave it open until the looping operation of the recordset was completed. This method was not suitable for Web programming which required a disconnected way of manipulating data. This was because a connection-based data access methodology required a connection to be kept alive for each client connection.

A DataReader provides a simple method of iterating through the query. 5), I populate a DropDownList by iterating through the Groups table using the DataReader. 5: DataReader. Item("code_display"))) End While End Sub

DropDownList & Reader

The DataReader uses the OleDbCommand to populate the command object. After the execute method is run, we can iterate dbRead (the DataReader) to populate the DropDownList.

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