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What is the wildcard character in SQL? Let us say you want to query database with LIKE for all employees whose name starts with La. The wildcard character is %, the proper query with LIKE would involve La%. What is the role of the DataReader class in ADO.NET connections? It returns a read-only dataset from [...]

Can I define a type that is an alias of another type (like typedef in C++)? Not exactly. You can create an alias within a single file with the “using” directive: using System; using Integer = System.Int32; // alias But you can’t create a true alias, one that extends beyond the file in which it [...]

How do you mark a method obsolete? [Obsolete] public int Foo() {…} or [Obsolete(\"This is a message describing why this method is obsolete\")] public int Foo() {…} Note: The O in Obsolete is always capitalized. How do you implement thread synchronization (Object.Wait, Notify,and CriticalSection) in C#? You want the lock statement, which is the same [...]