number.isinteger C# code example

Example 1: c# how to check string is number

string s1 = "123";
string s2 = "abc";

bool isNumber = int.TryParse(s1, out int n); // returns true
isNumber = int.TryParse(s2, out int n); // returns false

Example 2: validate int have 3 digits c#

int X = 9;

string PaddedResult = X.ToString().PadLeft (3, '0'); // results in 009