Difference between ref and out parameters?

Here we discus ref and out parameters in c#. We can use these parameters in different ways.

Ref Parameter:-

It is used as a call by reference value in c#. When its value of parameter is changed in the method, it gets reflected in the calling method.

Out parameter:-

It is used like a ref parameter, but argument can be passed without any value assigning to it. Sometime we do not want to give an initial value to parameter; in this case we use out keyword. The declaration of out keyword is same as ref keyword.

Important facts about ref and out keywords:-

We cannot use ref and out keyword in method overloading simultaneously. Ref and out keyword treated as same datatype at compile time but differently at run-time. Hence method with single parameter cannot be overloaded when one method take ref parameter and another method take out parameter.