let data = (“John Doe”, 42)

printf “%A” data
// Output: (“John Doe”,42)

public class Tuple<T1>
up to:
public class Tuple<T1, T2, T3, T4, T5, T6, T7, TRest>

using System;
using System.Linq;
using System.Collections.Generic;

namespace TupleTest
{
   class TupleCS4
   {
  #region Methods (4)

  // Public Methods (4)

       public static Tuple<string, string> GetFNameLName(string name)
       {
           if (string.IsNullOrWhiteSpace(name))
               throw new NullReferenceException("name is empty.");

           var nameParts = name.Split(',');

           if (nameParts.Length != 2)
               throw new FormatException("name must contain ','");

           return Tuple.Create(nameParts[0], nameParts[1]);
       }

       public static void PrintSelectedTuple()
       {
           var list = new List<Tuple<string, int>>
                          {
                              new Tuple<string, int>("A", 1),
                              new Tuple<string, int>("B", 2),
                              new Tuple<string, int>("C", 3)
                          };

           var item = list.Where(x => x.Item2 == 2).SingleOrDefault();
           if (item != null)
               Console.WriteLine("Selected Item1: {0}, Item2: {1}",
                   item.Item1, item.Item2);
       }

       public static void PrintTuples()
       {
           var tuple1 = new Tuple<int>(12);
           Console.WriteLine("tuple1 contains: item1:{0}", tuple1.Item1);

           var tuple2 = Tuple.Create("Item1", 12);
           Console.WriteLine("tuple2 contains: item1:{0}, item2:{1}",
               tuple2.Item1, tuple2.Item2);

           var tuple3 = Tuple.Create(new DateTime(2010, 5, 6), "Item2", 20);
           Console.WriteLine("tuple3 contains: item1:{0}, item2:{1}, item3:{2}",
               tuple3.Item1, tuple3.Item2, tuple3.Item3);
       }

       public static void Tuple8()
       {
           var tup =
               new Tuple<int, int, int, int, int, int, int, Tuple<int, int>>
                   (1, 2, 3, 4, 5, 6, 7, new Tuple<int, int>(8, 9));

           Console.WriteLine("tup.Rest Item1: {0}, Item2: {1}",
                   tup.Rest.Item1,tup.Rest.Item2);
       }

  #endregion Methods
   }
}

using System;

namespace TupleTest
{
   class Program
   {
       static void Main()
       {
           var data = TupleCS4.GetFNameLName("Vahid, Nasiri");
           Console.WriteLine("Data Item1:{0} & Item2:{1}",
                   data.Item1, data.Item2);

           TupleCS4.PrintTuples();

           TupleCS4.PrintSelectedTuple();

           TupleCS4.Tuple8();

           Console.WriteLine("Press a key...");
           Console.ReadKey();
       }
   }
}

public class Person
{
   public string FirstName { get; set; }
   public string LastName { get; set; }
   public string FullName
   {
       get
       {
                return FirstName + " " + LastName;
       }
   }
}

public string FullName
{
       get { return FirstName + " " + LastName; }
}

{ get { return your expression; } }

=> your expression;

public class Person
{
        public string FirstName { get; set; }
        public string LastName { get; set; }

        public string FullName => FirstName + " " + LastName;
}

public string this[int number]
{
            get
            {
                if (number >= 0 && number < _values.Length)
                {
                    return _values[number];
                }
                return "Error";
            }
}

public string this[int number] => (number >= 0 && number < _values.Length) ? _values[number] : "Error";

public override string ToString()
{
      return FirstName;
}

public override string ToString() => FirstName;

public int DoubleTheValue(int someValue) => someValue * 2;

public override string ToString()
{
       if (MiddleName != null)
       {
                return FirstName + " " + MiddleName + " " + LastName;
       }
       else
       {
                return FirstName + " " + LastName;
       }
}

public override string ToString() =>
                    (MiddleName != null)
                    ? FirstName + " " + MiddleName + " " + LastName
                    : FirstName + " " + LastName;

public IEnumerable<int> SmallNumbers()
{
    for (int i = 0; i < 10; i++)
        yield return i;
}

public IEnumerable<int> SmallNumbers() => from n in Enumerable.Range(0, 10)
                                                                         select n;

public IEnumerable<int> SmallNumbers() => Enumerable.Range(0, 10).Select(n => n);

برای پراپرتی‌ها:

public static IEnumerable<Claim> ParseClaimsFromJwt(string jwt)
        {
            var claims = new List<Claim>();
            var payload = jwt.Split('.')[1];

            var jsonBytes = ParseBase64WithoutPadding(payload);

            var keyValuePairs = JsonSerializer.Deserialize<Dictionary<string, object>>(jsonBytes);
           
            claims.AddRange(keyValuePairs.Select(kvp => new Claim(kvp.Key, kvp.Value.ToString())));
            ExtractRolesFromJwt(claims, keyValuePairs);
            return claims;
        }

private static void ExtractRolesFromJwt(List<Claim> claims, Dictionary<string, object> keyValuePairs)
        {
            keyValuePairs.TryGetValue(ClaimTypes.Role, out object roles);
            if (roles != null)
            {
                var parsedRoles = roles.ToString().Trim().TrimStart('[').TrimEnd(']').Split(',');
                if (parsedRoles.Length > 1)
                {
                    claims.AddRange(parsedRoles.Select(parsedRole => new Claim(ClaimTypes.Role, parsedRole.Trim('"'))));
                }
                else
                {
                    claims.Add(new Claim(ClaimTypes.Role, parsedRoles[0]));
                }
                keyValuePairs.Remove(ClaimTypes.Role);
            }
        }

C:\Program Files\Microsoft ASP.NET\ASP.NET Web Pages\v1.0\Assemblies\WebMatrix.Data.dll

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
 <add key="systemData:defaultProvider" value="System.Data.SqlClient" />
</appSettings>
<connectionStrings>
 <add name="Northwind"
     connectionString="Data Source=(local);Integrated Security = true;Initial Catalog=Northwind"
     providerName="System.Data.SqlClient" />
</connectionStrings>
</configuration>

using System;
using WebMatrix.Data;

namespace TestMicrosoftDataLibrary
{
 class Program
 {
     static void Main(string[] args)
     {
         getProducts();

         Console.Read();
         Console.WriteLine("Press a key ...");
     }

     private static void getProducts()
     {
         using (var db = Database.Open("Northwind"))
         {
             foreach (var product in db.Query("select * from products where UnitsInStock < @0", 20))
             {
                 Console.WriteLine(product.ProductName + " " + product.UnitsInStock);
             }
         }
     }
 }
}

private static void getCustomerFax()
{
         using (var db = Database.Open("Northwind"))
         {
             var product = db.Query("SELECT * FROM [Customers] WHERE City=@0", "Paris").FirstOrDefault();
             if (product != null)
                 Console.WriteLine(product.Fax);
             else
                 Console.WriteLine("not found.");
         }
}

private static void ExecQuery()
{
         using (var db = Database.Open("Northwind"))
         {
            int affectedRecords = db.Execute("UPDATE [Customers] SET fax = fax + '*' WHERE  City = @0", "Paris");
            Console.WriteLine("Affected records: {0}", affectedRecords);
         }
}

private static void ExecSPShowResult()
{
         using (var db = Database.Open("Northwind"))
         {
             var customer = db.Query("exec CustOrderHist @0", "ALFKI").FirstOrDefault();
             if (customer != null)
             {
                 Console.WriteLine(customer.ProductName);
             }
         }
}

private static void useFuncs()
{
         using (var db = Database.Open("Northwind"))
         {
             var query = db.Query("SELECT dbo.FN_GET_CATEGORY_TREE(@0) as Rec1", 3);
             foreach(var tree in query)
             {
                 Console.WriteLine(tree.Rec1);
             }
         }         
}