IsPrime?

public static bool IsPrime(Int32 ToBeChecked)
{
System.Collections.BitArray numbers = new System.Collections.BitArray(ToBeChecked+1, true);

for (Int32 i = 2; i < ToBeChecked+1; i++)
if (numbers[[b][/b]i])
{
for (Int32 j = i * 2; j < ToBeChecked+1; j += i)
numbers[j] = false;

if (numbers[i])
{
if (ToBeChecked == i)
{
return true;
}
}
}

return false;
}