C # math. Round () function problems

Math. Round () has a problem in rounding:
Math. Round (2.5, 0) = 2;
Math. Round (3.5, 0) = 4;

2.5 should be equal to 3!

This problem also exists in ASP, but there is a formatnumber in ASP that can be used, but I do not know how to use it yet?

Explanation:

Math. round, while 5 is in the center, if rounding, it will cause the overall data deviation. Therefore, the principle is: if the rounding bit is 5, the last digit after rounding is an even number, this is an international practice.

Currently, five projects are required. solution:

The current practice is:
For example: (3.45*10 + 0.5) Get an integer and divide it by 10.