var nums = Enumerable.Range( 0, 1000000 ).ToArray();
long total = 0;

// Use type parameter to make subtotal a long, not an int
Parallel.For< long >( 0, nums.Length, () => 0,
                      ( j, loop, subtotal ) =>
                      {
                          subtotal += nums[j];
                          return subtotal;
                      },
                      x => Interlocked.Add( ref total, x ) );
Console.WriteLine( "The total is {0:N0}", total ); 

var nums = Enumerable.Range( 0, 1000000 ).ToArray();
long total = 0;
Parallel.ForEach< int, long >( nums, // source collection
                               () => 0, // method to initialize the local variable
                               ( j, loop, subtotal ) => // method invoked by the loop on each iteration
                               {
                                   subtotal += j; //modify local variable
                                   return subtotal; // value to be passed to next iteration
                               },

                               // Method to be executed when each partition has completed.
                               // finalResult is the final value of subtotal for a particular partition.
                               finalResult => Interlocked.Add( ref total, finalResult ) );
Console.WriteLine( "The total from Parallel.ForEach is {0:N0}", total );

dynamic Type

var i = 20;
dynamic dynamicVariable = i;
Console.WriteLine( dynamicVariable );

var stringVariable = "Example string.";
dynamicVariable = stringVariable;
Console.WriteLine( dynamicVariable );

var dateTimeVariable = DateTime.Today;
dynamicVariable = dateTimeVariable;
Console.WriteLine( dynamicVariable );

// The expression returns true unless dynamicVariable has the value null.
if ( dynamicVariable is dynamic )
    Console.WriteLine( "dynamicVariable variable is dynamic" );

// dynamic and the as operator.
dynamicVariable = i as dynamic;

// throw RuntimeBinderException if the associated object doesn't have the specified method.
// The code is still compiling successfully.
Console.WriteLine( dynamicVariable.ToNow1 );

dynamic sampleObject = new ExpandoObject();
sampleObject.FirstName = "Vahid";
sampleObject.LastName = "Mohammad Taheri";
sampleObject.Age = "28";
sampleObject.TestRemoveProperty = DateTime.Now;
sampleObject.AsString = new Action( () => Console.WriteLine( "{0} {1} is {2} years old.",
                                                                sampleObject.FirstName,
                                                                sampleObject.LastName,
                                                                sampleObject.Age ) );
sampleObject.AsString();

( (IDictionary< String, Object >)sampleObject ).Remove( "TestRemoveProperty" );