Bits of .NET

ReadOnlySpan<char> input = "order:12345".AsSpan();
var idPart = input.Slice(input.IndexOf(':') + 1);

int id = int.Parse(idPart);

Why this is powerful:

• No substring allocations

• No temporary strings

• Works directly on memory

When to use it:
Parsing, slicing, validation, protocol handling.

When NOT to:
Async methods (unless carefully scoped).

This is how modern .NET hits native-level performance.