Infix Evaluation using Stack

Infix.cs

string ops = "+-*/";
string vals = "1234567890";
Stack<char> opStack = new Stack<char>();
Stack<int> valStack = new Stack<int>();

void Main()
{

	string expr = "(1 + ((2+3)*(4*5)))";
	foreach (char c in expr)
	{
		if(vals.Contains(c.ToString()))
			valStack.Push(Convert.ToInt32(c.ToString()));
		if(ops.Contains(c.ToString()))
			opStack.Push(c);
		if(c == '(')
			//ignore
			continue;
		if(c ==')')
		{
		   int x = valStack.Pop();
		   int y = valStack.Pop();
		   char op = opStack.Pop();
		   if(op == '+')
		   	valStack.Push(x + y);
		   if(op == '-')
		   	valStack.Push(x - y);
		   if(op == '*')
		   	valStack.Push(x * y);
		   if(op == '/')
		   	valStack.Push(x / y);
		  
		}
		//valStack.Dump("Value Stack");
		//opStack.Dump("Op stack");
	}
	valStack.Dump("Result is");
	
}

// Define other methods and classes here