The UnsignedMod method is a static extension method in the SandboxSystemExtensions class. It calculates the unsigned modulus of two integers, a and b. This method is useful when you need to ensure that the result of a modulus operation is always non-negative, even if the dividend is negative.

To use the UnsignedMod method, pass two integer parameters, a and b, where a is the dividend and b is the divisor. The method will return the remainder of the division of a by b, ensuring that the result is non-negative.

Note: The divisor b should not be zero, as this will result in a division by zero error.