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lang-cs
OracleCommandExecuteScalarreturns an object for the result. It's not strongly typed because the SQL statement is arbitrary, so the type isn't known until it's parsed (which is by the DB engine, not by the .NET runtime). The object returned can benull. You are assuming it is a string, and it may well be, and a lot of types can be implicitly converted to such, but it's a very dangerous assumption to make - that object can be of any type. As with any other object reference that you don't explicitly trust, first you should make sure it's notnull.