Question

If string is empty or null,

Shouldn’t string.split(“;”) should throw an error ?

for me I am trying this code and goes through it without any error,

string a = string.empty;

if (a.Split(';').Length - 1 < 1)

Can anyone tell me why it not throws an error and why if statement is true.

Answer 1

If the string is null, .Split() will (obviously) throw a NullReferenceException, like any other instance method.

If the string is empty, .Split() will return an array of a single empty string (unless you pass StringSplitOptions.RemoveEmptyEntries).
This is a corner case of its more general (and less unexpected) behavior; if the delimiter does not appear anywhere in the source string, it will return an array containing the entire source string.