The Weird and The Wonderful

string name = "Mark";
var date = DateTime.Now;

// Composite formatting:
Console.WriteLine("Hello, {0}! Today is {1}, it's {2:HH:mm} now.", name, date.DayOfWeek, date);
// String interpolation:
Console.WriteLine($"Hello, {name}! Today is {date.DayOfWeek}, it's {date:HH:mm} now.");
// Both calls produce the same output that is similar to:
// Hello, Mark! Today is Wednesday, it's 19:40 now.

var who = "world";
console.log(`hello, ${who}`);

hello, world

var who = "world";
console.log("hello, " + who);

string finalAnswer = $@"this is the answer to the question: {40+2}";
Console.WriteLine(finalAnswer);

string finalAnswer = @$"this is the answer to the question: {40+2}";  // syntax error
Console.WriteLine(finalAnswer);

"<ArgTest><Parameter>Value</Parameter></ArgTest>"

<StartArguments>"<ArgTest><Parameter>Value</Parameter></ArgTest>"</StartArguments>

<ArgTest><Parameter>Value</Parameter></ArgTest>
Value
"c:\Project\ArgTest\bin\Debug\ArgTest.exe" "<ArgTest><Parameter>Value</Parameter></ArgTest>"
Value

"<ArgTest xmlns="http://schemas.microsoft.com/developer/msbuild/2003"><Parameter>Value</Parameter></ArgTest>"

<ArgTest xmlns=http://schemas.microsoft.com/developer/msbuild/2003><Parameter>Value</Parameter></ArgTest>
'http' is an unexpected token. The expected token is '"' or '''. Line 1, position 16.
"c:\Project\ArgTest\bin\Debug\ArgTest.exe" "<ArgTest xmlns="http://schemas.microsoft.com/developer/msbuild/2003"><Parameter>Value</Parameter></ArgTest>"
Not found

namespace CP
{
  public static partial class ArgTest
  {
    static int 
    Main
    (
      string[] args
    )
    {
      int result = 0 ;

      System.Xml.XmlDocument doc = new System.Xml.XmlDocument() ;

      try
      {
        System.Console.WriteLine ( args [ 0 ] ) ;
      
        doc.LoadXml ( args [ 0 ] ) ;

        System.Xml.XmlNode val = doc.DocumentElement.SelectSingleNode ( "Parameter" ) ;

        if ( val == null )
        {
          System.Console.WriteLine ( "Not found" ) ;
        }
        else
        {
          System.Console.WriteLine ( val.InnerText ) ;
        }
      }
      catch ( System.Exception err )
      {
        System.Console.WriteLine ( err.Message ) ;
      }

      try
      {
        System.Console.WriteLine ( System.Environment.CommandLine ) ;

        int s = System.Environment.CommandLine.IndexOf ( "\"<" ) + 1 ;
        int e = System.Environment.CommandLine.IndexOf ( ">\"" ) + 1;

        doc.LoadXml ( System.Environment.CommandLine.Substring ( s , e - s ) ) ;

        System.Xml.XmlNode val = doc.DocumentElement.SelectSingleNode ( "Parameter" ) ;

        if ( val == null )
        {
          System.Console.WriteLine ( "Not found" ) ;
        }
        else
        {
          System.Console.WriteLine ( val.InnerText ) ;
        }
      }
      catch ( System.Exception err )
      {
        System.Console.WriteLine ( err.Message ) ;
      }

      return ( result ) ;
    }
  }
}

switch (str)
{
    case "4":
        if (str != "5") ...