How to create a new Active Directory Group with "#" as the first character in its name by using C#?

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How to create a new Active Directory Group with "#" as the first character in its name by using C#?

the code like below,but it not work:

string name = "#ABC";
public void Create(string ouPath, string name)
{
    if (!DirectoryEntry.Exists("LDAP://CN=" + name + "," + ouPath))
    {
         try
         {
            DirectoryEntry entry = new DirectoryEntry("LDAP://" + ouPath);
            DirectoryEntry group = entry.Children.Add("CN=" + name, "group");
            group.Properties["sAmAccountName"].Value = name;
            group.CommitChanges();
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message.ToString());
        }
    }
    else { Console.WriteLine(path + " already exists"); }
}