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namespace TimespanTest
{
    class Program
    {
        static void Main(string[] args)
        {
            DateTime A = DateTime.Now;
            System.Threading.Thread.Sleep(100);
 
            TimeSpan B = DateTime.Now.Subtract(A);
            System.Threading.Thread.Sleep(1000);
            TimeSpan C = DateTime.Now.Subtract(A);
 
            TimeSpan D = C.Subtract(B);
 
            Console.WriteLine("{0}", D.ToString());
 
            return ;
        }
    }
}

prog.cs(7,13): error CS0246: The type or namespace name `DateTime' could not be found. Are you missing a using directive or an assembly reference?
prog.cs(10,13): error CS0246: The type or namespace name `TimeSpan' could not be found. Are you missing a using directive or an assembly reference?
prog.cs(12,13): error CS0246: The type or namespace name `TimeSpan' could not be found. Are you missing a using directive or an assembly reference?
prog.cs(14,13): error CS0246: The type or namespace name `TimeSpan' could not be found. Are you missing a using directive or an assembly reference?
Compilation failed: 4 error(s), 0 warnings

Standard output is empty