out is like ref modifier, but when calling the method you don't have to provide a value for the out parameter.
The out parameter must have an assigned value in the method.
using System;
class Program
{
static void change(out int i)
{
Console.WriteLine("set the value in the change method");
i = 10;
}
static void Main(string[] args)
{
int i = 1;
Console.WriteLine("before changing:" + i);
change(out i);
Console.WriteLine("after changing:" + i);
}
}
The output:
before changing:1
set the value in the change method
after changing:10
out modifiers are often used to get value out of a method.
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