By default, .Net rounds mid-point number to nearest even number:

` var roundedValue35 = Math.Round(3.5);`

Console.WriteLine("Default Rounded Value for 3.5 is {0}", roundedValue35);//print:4

var roundedValue45 = Math.Round(4.5);

Console.WriteLine("Default Rounded Value for 4.5 is {0}", roundedValue45);//print:4

var roundedValue325_1 = Math.Round(3.25, 1);

Console.WriteLine("Default Rounded Value for 3.25 with 1 is {0}", roundedValue325_1);//print:3.2

You can change this default behaviour by passing MidpointRounding.AwayFromZero to the method as below:

`roundedValue35 = Math.Round(3.5, MidpointRounding.AwayFromZero);`

Console.WriteLine("Rounded Value by passing MidpointRounding.AwayFromZero to the Round method for 3.5 is {0}", roundedValue35);//print:4

roundedValue45 = Math.Round(4.5, MidpointRounding.AwayFromZero);

Console.WriteLine("Rounded Value by passing MidpointRounding.AwayFromZero to the Round method for 4.5 is {0}", roundedValue45);//print:5

roundedValue325_1 = Math.Round(3.25, 1, MidpointRounding.AwayFromZero);

Console.WriteLine("Rounded Value by passing MidpointRounding.AwayFromZero to the Round method for 3.25 with 1 is {0}", roundedValue325_1);//print:3.3

Sample Code for Download