Example of practical of “ref” use [closed]

Answer 1

The TryParse methods built into the framework are typical examples. They use out instead of ref but it is the same semantics, it's just that the caller doesn't need to initialize the value. Example:

int result;
bool isSuccess = int.TryParse("some string", out result);
if (isSuccess)
{
    // use the result here
}

As you can see the function returns a boolean indicating whether the operation succeeds but the actual result is returned as out parameter.