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# NpgsqlParameterCollection.Contains Method

Gets a value indicating whether a NpgsqlParameter exists in the collection.

#### Overload List

Gets a value indicating whether a NpgsqlParameter exists in the collection.

> public bool Contains(object);

Gets a value indicating whether a NpgsqlParameter with the specified parameter name exists in the collection.

> public bool Contains(string);

#### See Also

NpgsqlParameterCollection Class | Npgsql Namespace