How can I do take a substring and length of a string in C# if that string might be a null? -


i have following strings:

var temp = null; var temp = ""; var temp = "12345678"; var temp = "1234567890";

what need if have function give me last 4 digits of input variable if input variable 8 or 10 characters long. otherwise need return "";

is there easy way can in c#. not sure how deal null because if length of null think give me error.

int length = (temp ?? "").length; string substring = ""; if(length == 8 || length == 10) { substring = temp.substring(length - 4); }

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