BlobSasPermissions
 BlobSasPermissions contains the list of
            permissions that can be set for a blob's access policy.  Use
             SetPermissions
            to set the permissions on the  BlobSasBuilder.
            
                using System;
namespace Azure.Storage.Sas
{
    [Flags]
    public enum BlobSasPermissions
    {
        Read = 1,
        Add = 2,
        Create = 4,
        Write = 8,
        Delete = 16,
        Tag = 32,
        DeleteBlobVersion = 64,
        List = 128,
        Move = 256,
        Execute = 512,
        SetImmutabilityPolicy = 1024,
        PermanentDelete = 2048,
        All = -1
    }
}