Traditionally, C# has been considered as a strongly typed language. But with the addition of the dynamic keyword in C# 4.0, you can choose to declare and use dynamically typed variables. These variables are not type-checked at compile time, but only at run-time.
For example, the following code will not compile. The String.Concat method is being used incorrectly. (It’s a static method).
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| string s = "Et tu";s = s.Concat(" Brutus"); // Compile-time error |
In the following example, we declare the variable as dynamic, which means that the type of the variable is only determined at run-time. No type-checking is done at compile-time. This code will now compile fine. The error will only be found at run-time, when an exception is thrown.
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| dynamic s = "Et tu";s = s.Concat(" Brutus"); // This compiles |