c# check if string is all numbers
if (str.All(char.IsDigit)) {
// String only contains numbers
}c# check if string is all numbers
if (str.All(char.IsDigit)) {
// String only contains numbers
}c# see if string is int
bool result = int.TryParse("123", out var n);c# check if int is null
// When trying to check if your int is null or i.e. 'not set',
// you will get the following error:
// The result of the expression is always 'false'
// since a value of type 'int' is never equal to 'null' of type 'int?'
// You can however bypass this by converting your int to string:
int myInt = null;
// This Method will return a bool;
bool isNullInt = string.IsNullOrEmpty(myInt.ToString());
// isNullInt will be in this case trueCopyright © 2021 Codeinu
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