Check and ensure int value is only numbers

Question

Hi Guys,

 

I need to check, my int values which am giving as input should be only numerical value.

 

int.Tryparse wont work because am not using a string value.

 

what is the alternate way to get for int value to be numeric.

 

 

class Program

{

static void Main(string[] args)

{

Console.WriteLine("Please enter salary");

int salary = Convert.ToInt32(Console.ReadLine());

 

******* Need to check the SALARY value to be only numeric value and not equal to null also*********

 

int Output = UserProgramCode.Bonus(salary);

Console.WriteLine("Output is: {0}", Output);

Console.ReadLine();

}

class UserProgramCode

{

public static int Bonus(int salary)

{

int b = 0;

if (salary < 0)

{

b = -1;

}

else if (salary > 10000 && salary < 15001)

{

b = 1200 + ((salary * 15) / 100);

}

else

{

b = 500 + ((salary * 8) / 100);

}

}

return b;

}

}