Answer / kamalakannan.a

Datareader is read only or forward only.So it is very fast
to fetch the data from database.

Answer / manikandan

Data reader is usefull when we just want to acccess datas
from the database not when we want to perform DML
operations. and It is usefull when we want to perform
forward only reading of datas.It wont requires any
large volume of resources in the Front end.

Answer / bhushanam

its connection oriented architecture.

Answer / payal

1)it is used for forward record only.

2)we cannot update or save

3)speed is fast than dataset

4)not persist any record

5)it is usefual in case of display data according to
critiera on form using control like textbox,label etc.

who to use

in vb.net
dim sqlcmd as new sqlcmd("select ename from tblemp where
empid=5;
dim dr as new dataReader
dr=sqlcmd.executeReader()
if dr.hasRows then
txtbox1.text(dr("ename"))
end if

this display ename in textbox.

Answer / anitha

Datareader is used to fetch the data frm data source

I'm unable to open a .hlp file using vb.net application.

1 Answers  

Explain clr?

0 Answers  

What are the different types of Lock available in Visual Basic?

0 Answers   CGI,

Explain the difference between namespace and assembly?

0 Answers  

Explain enumerator?

0 Answers  

Explain about globalization?

0 Answers  

What is the advantages of VB.NET?

0 Answers   NA,

how to get dynamic control array position or its index position?

0 Answers   CMC,

What are the advantages of migrating to vb.net?

0 Answers  

How can I extract the formated word(bold,italic,underline,font,color etc) from the msword file.?

0 Answers  

what are the advantages and diadvantages of active reports over crystal reports ?

1 Answers   IBM, Kotak,

What are the difference between structure and class?

0 Answers