DOT NET Interview Questions - DotNetSpider

Delete
Deletes the specified row from “DataView” object.
(B) What’s difference between “DataSet” and “DataReader”
?
Twist :- Why is DataSet slower than DataReader ?
Fourth point is the answer to the twist.
Note:- This is my best question and i expect everyone to answer it.It’s asked almost 99% in
all companies....Basic very Basic cram it.
Following are the major difference between “DataSet” and “DataReader” :-
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“DataSet” is a disconnected architecture , while “DataReader” has live
connection while reading data.So if we want to cache data and pass to a
different tier “DataSet” forms the best choice and it has decent XML support.
When application needs to access data from more than one table “DataSet”
forms the best choice.
If we need to move back while reading record’s , “datareader” does not support
this functionality.
But one of the biggest drawbacks of DataSet is speed.As “DataSet” carry
considerable overhead because of relations,multiple tables etc speed is slower
than “DataReader”.Always try to use “DataReader” whereever possible. , as
it’s meant specially for speed performance.
(B) How can we load multiple tables in a DataSet ?
objCommand.CommandText = "Table1"
objDataAdapter.Fill(objDataSet, "Table1")
objCommand.CommandText = "Table2"
objDataAdapter.Fill(objDataSet, "Table2")
Above is a sample code which shows how to load multiple “DataTable” object’s in one
“DataSet” object.Sample code shows two tables “Table1” and “Table2” in object
ObjDataSet.
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