private static async Task CreateSharedAccessPolicyAsync(CloudBlobContainer container, string policyName)

{

    // Create a new shared access policy and define its constraints.

    // The access policy provides create, write, read, list, and delete permissions.

    SharedAccessBlobPolicy sharedPolicy = new SharedAccessBlobPolicy()

    {

        // When the start time for the SAS is omitted, the start time is assumed to be

     // the time when the storage service receives the request.

        // Omitting the start time for a SAS that is effective immediately helps to

     // avoid clock skew.

        SharedAccessExpiryTime = DateTime.UtcNow.AddHours(24),

        Permissions = SharedAccessBlobPermissions.Read |

             SharedAccessBlobPermissions.List |

                    SharedAccessBlobPermissions.Write | 

            SharedAccessBlobPermissions.Create | 

            SharedAccessBlobPermissions.Delete

    };

    // Get the container's existing permissions.

    BlobContainerPermissions permissions = await container.GetPermissionsAsync();

    // Add the new policy to the container's permissions, and set the container's 

    // permissions.

    permissions.SharedAccessPolicies.Add(policyName, sharedPolicy);

    await container.SetPermissionsAsync(permissions);

}