Dynamic SQL (concatenated sql string) is a coding practice where by the queries are built in the program and sent to SQL Server for execution. This can allow the code to be injected into the dynamic queries causing a damage to the database.
A good alternative is to use parameterised queries where placeholders are set for the variables. The possibility of queries getting infected with injected code is completely removed with parameterized queries.
In addition to parameterized queries, it is alway a best practice to sanitize the input parameters before using them in queries.
Also the data input should be encoded appropriately especially in case of dynamic sql usage and to apply appropriate encoding when extracted from the database to avoid cross-site script execution.
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