string startsWith = "somestring:";
// Note: this works with any data type switch (startsWith) { // Using the 'when' keyword you can convert your case to a bool like // expression like so: case string when startsWith.StartsWith("somestring:"): Console.WriteLine("hit"); break; case string when startsWith.StartsWith("someotherstring:"):	Console.WriteLine("hit 1");	break;
}
// Output: hit