how to do something "by chance"?

[myndeswx]

Probably a simple question, but sometimes there is need to do something random by percentages, currently I am using such a solution, but I am sure there is something more elegant.
Here we generate a random number from 1 to 10, and only when it's 10 we pause for a longer time (10%), and if the number is 8 or 9 we pause for 5 sec. (20% chance).

Please share how you do this, thank you!

 

[Roman48]

https://zennolab.com/discussion/threads/ukazat-verojatnost-vypolnenija-v-procentax.94512/post-632962

Random rnd = Global.Classes.rnd;
lock(rnd)
{
//    Random r = new Random();
if(rnd.Next(1,100) < 50) return "Да";
else return "Нет";
}

 

[Phoenix78]

 

[myndeswx]

https://zennolab.com/discussion/threads/ukazat-verojatnost-vypolnenija-v-procentax.94512/post-632962

 Random rnd = Global.Classes.rnd;
lock (rnd)
{
// Random r = new Random ();
if (rnd.Next (1,100) <50) return "Yes";
else return "No";
}

Thank you for the response, but as I understand from the code it would return "yes" or "no" 50% of the time?
ahh, so the 50 is percentages, we just change that part. Very smart, thank you!