How to combine || operators in condition statement [duplicate]

Answer 1

If you have multiple if conditions you should always consider using switch statements as compiler will create Jumptables whereever possible to increase speed. You should take a look here for speed test. Thing to note here is that if number of conditions is big enough to cover overheads, C# compiler will also create a HashTable object.

So this is a better approach,

switch (foo) {
case "1":
case "5":
case "9":
    // ...
    break;
case "2":
case "4":
    // ...
    break;
}