You can evaluate any valid C# code:
int value = await CSharpScript.EvaluateAsync<int>("15 * 89 + 95");
var span = await CSharpScript.EvaluateAsync<TimeSpan>("new DateTime(2016,1,1) - DateTime.Now");
If type is not specified, the result is object
:
object value = await CSharpScript.EvaluateAsync("15 * 89 + 95");