Answer / Mr Sambhu Kumar

The concurrency mode can be specified in a WCF service by using the ConcurrencyMode attribute, which is applied to the service operation or contract class. The ConcurrencyMode enumeration allows you to choose from three modes: Single (only one request at a time), Reentrant (one thread can call the service multiple times concurrently) and Controlled (enables fine-grained control over concurrent access using a custom concurrency class).

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