How do I check if a number is positive or negative in C#?

Question

How do I check if a number is positive or negative in C#?

Answer 1

int j = num * -1;

if (j - num  == j)
{
     // Num is equal to zero
}
else if (j < i)
{
      // Num is positive
}
else if (j > i) 
{
     // Num is negative
}