How to check if a String is Integer in C#?

There will be scenarios where we will require validating if a given string is an integer.
The below code will help us to do the same.

string number = "100";
int no = 0;
if (int.TryParse(number, out no))
        {
Response.Write(no.ToString() + " is a valid number!");
        }
else
        {
Response.Write(no.ToString() + " is not a valid number!");
        }

You can also do this validation using regular expression. Refer below,

string number = "100";      
if (Regex.IsMatch(number, @"\d"))
        {
Response.Write(no.ToString() + " is a valid number!");
        }
else
        {
Response.Write(no.ToString() + " is not a valid number!");
        }