/// <summary>
/// Delete entity from contacts
/// </summary>
/// <param name='operations'>
/// The operations group for this extension method.
/// </param>
/// <param name='contactid'>
/// key: contactid of contact
/// </param>
/// <param name='ifMatch'>
/// ETag
/// </param>
public static void Delete(this IContacts operations, string contactid, string ifMatch = default(string))
{
operations.DeleteAsync(contactid, ifMatch).GetAwaiter().GetResult();
}