using System;
class Program
{
static void Main()
{
string quotedPart1 = "\"double-quoted substring1\"";
string quotedPart2 = "\"double-quoted substring2\"";
string str = $"This is a string with {quotedPart1}, and {quotedPart1} inside.";
Console.WriteLine(str);
}
}
/*
run:
This is a string with "double-quoted substring1", and "double-quoted substring1" inside.
*/