How do I force max 4 decimals without rounding up in C# / .NET

Example variables:

var example1 =  1,12345638282382384;
var example2 = 12,12;
var example3 = 30,19999;

Result what I want:

example1 = 1,1234;
example2 = 12,12; // 12,1200 would be better but isn't that important)
example3 = 30,1999;

What is the issue? I got more than 4 decimal numbers, but I want to only see 4 decimals. I search around the internet, but I only see examples of rounding up & full numbers getting a comma, while my example already have the comma’s.

Furthermore, I am a student/junior developer and at least tried to search around before asking, hopefully someone knows the answer.

>Solution :

Math.Round allows you to specify the rounding behavior you want, eg Math.Round(example1,4,MidpointRounding.ToZero) produces 1.1234.

C# > var example1 =  1.12345638282382384;

C# > Math.Round(example1,4)
╭─✔──────────────────────────────────────────────────────────────╮
│ 1.1235                                                         │
╰────────────────────────────────────────────────────────────────╯
C# >  Math.Round(example1,4,MidpointRounding.ToZero)
╭─✔──────────────────────────────────────────────────────────────╮
│ 1.1234                                                         │
╰────────────────────────────────────────────────────────────────╯