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Monday, 21 September 2015

Most recent asked ADO.NET Interview Questions and Answers

26 :: what is typed and untyped dataset?
A DataSet can be Typed or Untyped. The difference between the two lies in the fact that a Typed DataSet has a schema and an Untyped DataSet does not have one. It should be noted that the Typed Datasets have more support in Visual studio.

27 :: I loaded the dataset with a table of 10 records.
 One of the records is deleted from the backend, How do you check whether all the 10 records were present while updating the
data(Which event and steps) and throw the exception.
By Using the Transactions we can check the Exact Numbers of the rows to be updated and if the updation fails then the Transaction will be rollbacked.

28 :: Can dataReader hold data from multiple tables?
data reader can hold data from multiple tables and datareader can hold more than one table.
string query="select * from employee; select * from student";

sqlcommand cmd=new sqlcommand(query, connection);

sqldatareader dr=cmd.executeReader();

if(dr.hasrows)

{

dr.read();

gridview1.DataSource=dr;

gridview1.Databind();

if(dr.nextresult)

{

gridview2.datasource=dr;

gridview2.databind();

}

}

dr.colse();

connection.close();

29 :: What is different between SqlCommand object and Command Behavior Object?
DO.NET Command Object - The Command object is similar to the old ADO command object.
It is used to store SQL statements that need to be executed against a data source.
The Command object can execute SELECT statements, INSERT, UPDATE, or DELETE statements, stored procedures, or any other statement understood by the database.

30 :: what is bubbled event can u pls explain?
all heavy controls like grid view,datagrid or datalist,repeater controls cantains the chield controls like button or link button, when we click this button then the event will be raised, that events are handled by parant controls,that is called event bubbling,means event is bubbled from bottom(chield)to up(parant).

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