ADO.Net interview question and answers, ADO.Net Interview questions
Hi , Today i Would like to share some more Important ADO.NET interview questions and answers.
1). How you can add or remove rows from DataTable object of DataSet?
The DataRowCollection class defines collection of rows for DataTable object in a DataSet. The DataTable class provides the NewRow() method to add a new DataRow to the DataTable. The NewRow method creates a new row, which implements the same schema as applied to the DataTable. The following are methods provided by the DataRowCollection object:
- Add() - Adds a new row to DataRowCollection.
- Remove()- it Removes a DataRow object from DataRowCollection.
- RemoveAt() - it Removes a row whose location is specified by an index number.
2). Explain in brief about DataAdapter class in ADO.NET.(very very Important)
The DataAdapter
class retrieves data from the database stores data in the dataset, and
reflects the changes made in the dataset to database. The DataAdapter class acts as an intermediary for all communication between the database and the DataSet object. The DataAdapter Class is used to fill a DataTable or DataSet Object with data from database using the called as Fill() method. The DataAdapter class applies the changes made in dataset to the database by calling Update() method.
The DataAdapter class provides four properties that represent the database command They are as follows:
SelectCommand, InsertCommand, DeleteCommand, and UpdateCommand.
• With dataset you retrieve data from the two databases like the oracle and sql server and merge them in one dataset , with record the set this is not possible
• All representation of Dataset is using the XML while record set uses the COM.
• Record set cannot be transmitted on the HTTP while Dataset can be.
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The DataAdapter class provides four properties that represent the database command They are as follows:
SelectCommand, InsertCommand, DeleteCommand, and UpdateCommand.
3) Can you explain the Basic difference between an ADO.NET Dataset and an ADO Record set?
There two main basic differences between record set and dataset They are as Follows:-• With dataset you retrieve data from the two databases like the oracle and sql server and merge them in one dataset , with record the set this is not possible
• All representation of Dataset is using the XML while record set uses the COM.
• Record set cannot be transmitted on the HTTP while Dataset can be.
4)What is Maximum Pool Size in the ADO.NET Connection String?
Maximum pool size decides the maximum number of the connection
objects to be pooled. If the maximum pool size is reached and there is
no usable connection available request is queued until the connections
are released back in to the pool. So it is always a good habit to call
close or dispose method of connection as soon as you have finished the
work with connection object.
5)How to enable and disable the connection pooling?
For .NET it is enabled by default but if you want to just make
sure set Pooling=true in connection string.in ordet to disable connection
pooling set Pooling=false in the connection string if it is an ADO.NET
Connection. If it is an OLEDBConnection object set OLE DB Services=-4 in connection string.
6) What are the two fundamental objects in ADO.NET?
DataReader and DataSet ---------------------------------------Best of Luck for your Career--------------------------------------------------
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