How to check if an integer includes a certain number in c#

Question

Is there a way I can check Integers if they contain a certain number in C#?

For example:

I want to check for 7. When I enter 17, the code

Answer 1

Convert it to a string, then use String.Contains:

int i = 17;
int j = 28
int k = 7;

bool a = i.ToString().Contains(k.ToString());
bool b = j.ToString().Contains(k.ToString());

Answer 2

int number = 17;
int digit = 7;
bool result = number.ToString().Contains(digit.ToString());