Code comparation

[izzetbaysal]

Hi all,
i need to find a way to compare c# codes. In other words, i will have a coding question requiring the user to write some code and solution code for the question. Then i will get input code from the user according to that question and compare these two results. For example i will have a question like : "Write some code that calculates the sum of the numbers between 1 and 10." and solution of the question will be like:

int sum=0;
for(int i=1; i<=10; i++)
{
      sum+=i;
}

After i get the user input i will compare the user's answer and my solution and user will get or lose points. But i need some suggestions for solving that problem. First, i mustn't compare codes as plain text because user may provide a different answer than my solution which is correct too. For example, users may write "int count=0;" instead of "int sum=0;" and they lose points eventhough their answers are correct. So i need a better technique to manage that. Actually what i need is to make the user's answer and my solution comparable by converting the codes to something unique. Please help me about that.
Any help would be greatly appreciated.

[nabeelisnabeel]

In programming competitions, the user's solution is verified against some random inputs.. and the output is checked.

[boudino]

You can process it with CSharpCodeProvider and than inspect the compiled assembly using reflection and compare the result with the expected one. Maybe visitor design pattern could be handy here.

[izzetbaysal]

Thanks for replying.. Comparing the compiled assembly and checking the output by using random inputs may work in some situations but if i have more complex questions (eg. writing classes) is it possible to find out a better solution??