sql injuction?

[lak211]

i asked one interviewer ,what is the use of sqlinjuction ?in asp.net

[vikasvaidya]

SQL injection is a technique that exploits a security vulnerability occurring in the database layer of an application. The vulnerability is present when user input is either incorrectly filtered for string literal escape characters embedded in SQL statements or user input is not strongly typed and thereby unexpectedly executed.

For more please go through wiki

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Regards,
Vikas Vaidya