How convert var to double (with Convert.To)?

Question

Var num = 5;
num = num + 2.55;
Convert.ToDouble(num);
Console.WriteLine(num);

Error!

Answer 1

Try this

var num = 5;

var num2 = Convert.ToDouble(num);

num2 += 2.55;

Console.WriteLine(num2 );

Answer 2

thx