How to Create a AD account

The code is just like:

                string strPath = "LDAP://OU=,DC=,DC=";
                DirectoryEntry myDE = new DirectoryEntry(strPath);
                DirectoryEntry newUser = myDE.Children.Add("cn=" + userName, "User");
                newUser.Properties["sAMAccountName"].Add(userName);
                newUser.Properties["displayName"].Add(userName);
                //newUser.Properties["streetAddress"].Add("");
                newUser.CommitChanges();

                newUser.Invoke("SetPassword", new object[] { "123456" });
                newUser.CommitChanges();

Then  you can add it to the existing roles.