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I am using SQL Server 2008. While I am restoring database from backup file I got the error.

Restore failed for Server 'WIN-TUT3YRM1MMN\SQLEXPRESS'. (Microsoft.SqlServer.SmoExtended)
System.Data.SqlClient.SqlError: RESTORE detected an error on page (44262:41495) in database "KBCLDBNEW" as read from the backup set. (Microsoft.SqlServer.Smo)

I have tried restoring in new database but still gives the error. I am cannot find the what is the problem. Thanks for helping me.

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Try running RESTORE VERIFYONLY and see if you get more information about the failure.

You could also try running RESTORE with CONTINUE_AFTER_ERROR and then run DBCC CHECKDB: 

RESTORE DATABASE database_name FROM backup_device WITH CONTINUE_AFTER_ERROR

(i.e. running as TSQL rather than through SMO)

DBCC CHECKDB(N'databasename') WITH EXTENDED_LOGICAL_CHECKS;

Specifying WITH CONTINUE_AFTER_ERROR in a RESTORE statement attempts to restore the database. However, there are many kinds of corruption that prevent recovering a database. We strongly recommend that you reserve using the CONTINUE_AFTER_ERROR option until you have exhausted all alternatives.

All backup strategies should include regular DBCC CHECKDB runs.

Also NOTE: You do not have a backup unless you periodically successfully test restores.

Responding to SQL Server Restore Errors Caused by Damaged Backups

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