Also, it's a good habit to put the constant before the variable it's being compared to.
i.e.
if (25 == a)
{
// Some action here
}
The reason for doing this,
if (25 = a)
{
}
Will cause a compiler error. Because you're trying to assign a variable to a constant. This coding habit will catch your error where, if you put = but meant == (a very common mistake). If you do a = 25 it will compile, but obviously not what was intended.