how to take backup and restore of mysql database in vb.net

Just create two batch files one is for taking backup & other one is for restore.
Call the batch file in .net.
http://www.dotnetspider.com/resources/19537-MySQL-Database-Backup-Restore-from-C-NET.aspx
 
-- For Taking backup
@ECHO off
cls
set DBchoice=%1%
set User=%2%
set Password=%3%
set pathchoice=%4%

@REM Remove double quotes from the path
@REM SET pathchoice=%pathchoice:"=%
@REM SET pathchoice=%pathchoice:"=%

mysqldump --add-drop-table -B %DBchoice% -u %User% --password=%Password%  > %pathchoice%

-- To Restore :
@ECHO off
cls

set User=%1%
set Password=%2%
set DBchoice=%3%
set pathchoice=%4%
set hostIP=%5%
set toolPath=%6%

@REM Remove double quotes from the path
@REM SET pathchoice=%pathchoice:"=%
@REM SET pathchoice=%pathchoice:"=%

%toolPath%\mysql -u %User% -h%hostIP% --password=%Password% %DBchoice% < %pathchoice%

http://www.dotnetspider.com/resources/19537-MySQL-Database-Backup-Restore-from-C-NET.aspx
 
To make backup
here is the vb code :
process.start("C:program files/mysql/bin/mysqldum.exe","-u username -p password --database=dbname > -r ""C:\back.sql""")


To restore
process.start("C:\porgram files\mysql\bin\mysql.exe","-u username -p password --database=dbname > -r ""C:\back.sql""")

http://forums.mysql.com/read.php?28,18395,181484
http://viralpatel.net/blogs/2009/01/mysql-database-backup-mysql-mysqldump-backup-command.html