Compile-time vs. Run-time, in Java and C#

[peniche]

I have read somewhere one of the main differences between Java and C++/C# is Java does something at Run-time and C# does something at compile-time. Is this true? If so could you explain this a bit more? In C#, I created a function which takes in two inputs and returns a random number (called \[code\]RandomNumber(int x, int y)\[/code\]), using the Random Object. I then called this function twice in another function, expecting to get two difference values (two different random numbers). However, I kept getting same values, which baffled me, since I can do the same thing in Java and expect to get different numbers.I then decided, to remove my function - RandomNumber(int x, int y) and call the Random inside my other function, show below.\[code\] Random random = new Random(); int randomNum; int la; randomNum = random.Next(1, 10); numOne.Text = randomNum.ToString(); la = random.Next(1, 10);\[/code\]This generates two different random numbers. Why is this the case?