Set and Get S3 AccessControlList. Require AWS SDK for .NET http://aws.amazon.com/sdkfornet/

SetAndGetS3AccessControlList.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Amazon.S3;
using Amazon.S3.Model;
using System.Collections.Specialized;
using System.Configuration;

namespace AWS_S3_Test
{
    class Program
    {
        static string accessKeyID = "Your AccessKey ID";
        static string secretAccessKeyID = "Your SecretAccessKey ID";
        static string awsAccountNumbers = "Your Account Numbers";
        static string bucketName = "S3BucketName";
        static AmazonS3 s3Client = null;

        static void Main(string[] args)
        {

            using (s3Client = Amazon.AWSClientFactory.CreateAmazonS3Client(accessKeyID, secretAccessKeyID))
            {
                GetS3ACL();
                SetS3ACL();
            }
        }

        static void GetS3ACL()
        {
            try
            {
                String filePath = "images/test.jpg";
                GetACLRequest getACLRequest = new GetACLRequest();
                getACLRequest
                    .WithBucketName(bucketName)
                    .WithKey(filePath);

                using (GetACLResponse response = s3Client.GetACL(getACLRequest))
                {
                    String xml = response.ResponseXml;
                    Console.WriteLine(xml);
                }

            }
            catch (AmazonS3Exception amazonS3Exception)
            {
                if (amazonS3Exception.ErrorCode != null &&
                    (amazonS3Exception.ErrorCode.Equals("InvalidAccessKeyId") ||
                    amazonS3Exception.ErrorCode.Equals("InvalidSecurity")))
                {
                    Console.WriteLine("Please check the provided AWS Credentials.");
                    Console.WriteLine("If you haven't signed up for Amazon S3, please visit http://aws.amazon.com/s3");
                }
                else
                {
                    Console.WriteLine("An error occurred with the message '{0}' when writing an object", amazonS3Exception.Message);
                }
            }
        }

        static void SetS3ACL()
        {
            try
            {
                S3AccessControlList acl = new S3AccessControlList();
                S3Grantee grantee = new S3Grantee();
                grantee.CanonicalUser = new Amazon.S3.Model.Tuple<string, string>()
                {
                    First = "User1 CanonicalUserId"
                    ,
                    Second = "User1 Display Name"
                };
                acl.AddGrant(grantee, S3Permission.FULL_CONTROL);

                S3Grantee grantee2 = new S3Grantee();
                grantee2.CanonicalUser = new Amazon.S3.Model.Tuple<string, string>()
                {
                    First = "User2 CanonicalUserId"
                  ,
                    Second = "User2 Display Name"
                };
                acl.AddGrant(grantee2, S3Permission.FULL_CONTROL);

                acl.Owner = new Owner()
                    .WithDisplayName("Owner Display Name")
                    .WithId("Owner CanonicalUserId");


                SetACLRequest setACLResuest = new SetACLRequest();

                String filePath = "images/test.jpg";
                setACLResuest
                    .WithKey(filePath)
                    .WithBucketName(bucketName)
                    .WithACL(acl);

                using (SetACLResponse response = s3Client.SetACL(setACLResuest))
                {
                    String resultXml = response.ResponseXml;
                }

            }
            catch (AmazonS3Exception amazonS3Exception)
            {
                if (amazonS3Exception.ErrorCode != null &&
                    (amazonS3Exception.ErrorCode.Equals("InvalidAccessKeyId") ||
                    amazonS3Exception.ErrorCode.Equals("InvalidSecurity")))
                {
                    Console.WriteLine("Please check the provided AWS Credentials.");
                    Console.WriteLine("If you haven't signed up for Amazon S3, please visit http://aws.amazon.com/s3");
                }
                else
                {
                    Console.WriteLine("An error occurred with the message '{0}' when writing an object", amazonS3Exception.Message);
                }
            }
        }

    }
}