using uCalcSoftware;

var uc = new uCalc();
// 1. Parse the expression string once to create a reusable object.
//var expr = uc.Parse("5 * 10");
using (var expr = new uCalc.Expression("5 * 10")) {
   
   // 2. Evaluate the pre-parsed object as many times as needed.
   Console.WriteLine(expr.Evaluate());
   Console.WriteLine(expr.Evaluate());

} // The expression object is automatically released here.