Answer / karna

data set a collection of datatables and we can edit the
data in the datatables and the same can be persisted to
databae using adapter in the disconnected maner by using
commandbuilder or insert,update,select command.

datareader is just the container for data,its readonly and
forwardonly curosr.this follows connected architecture,that
means when we are reading data from datareader at that time
connection should be kept open.

data reader can hold data from multiple tables and
datareader can hold more than one table.

Example:

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();

if anybody have any doubts,mail to me on karun84@gmail.com

Answer / naresh

Data reader:
1. It is a read only and forward only data access to data.
2. You can access one table at time.
3. It can't persist the data.
4. It is comes under connected architecture.
5. One of the most advantage is it is much faster than Data
Adapter

Data set:

1. It can access multiple tables at a time.
2. It can persist the data.
3. It is a relational data cache hosted in application
domain during execution.
4. It is a disconnected architecture.
5. It can't define with out data adapter.


Yes.dataReader hold data from multiple tables. The SELECT
statement may have columns that belong to one or more
"tables in the database". By example using a JOIN
or something similar.

Answer / sandyni

DataSet is a disconnected object and holds the data from
datastore. It can hold the data of more than one table.

where as dataReader is connected architecture which can
rbe used to read the data from the dataset in forward only
fashion. DataReader cannot hold multiple tables of data.

once data is fetched into dataset connection gets closed. but in datareader connection is always maintained...then why datareader is fast and mainly recommended ?

2 Answers  

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