Multiple updates to an Active Directory user in one pass

I'm trying to update a set of users in Active Directory from an Excel spreadsheet.

This is how I'm doing it now:

(oRow is a DataRow object)

SearchResult result = search.FindOne();

if (result != null)

DirectoryEntry user = result.GetDirectoryEntry();

if (user.Properties["employeeNumber"].Value == null)

user.Properties["employeeNumber"].Add(HashSSN(oRow["SSN"].ToString()));

if (oRow["First_Name"].ToString() != user.Properties["givenName"].ToString())

user.Properties["givenName"].Value = oRow["First_Name"].ToString();

if(oRow["Last_Name"].ToString() != user.Properties["sn"].ToString())

user.Properties["sn"].Value = oRow["Last_Name"].ToString();

if (user.Properties["initials"].Value == null)

user.Properties["initials"].Value = oRow["Middle_Init"].ToString();

if (oRow["Middle_Init"].ToString() != user.Properties["initials"].ToString())

user.Properties["initials"].Value = oRow["Middle_Init"].ToString();

if (user.Properties["telephoneNumber"].Value == null)

user.Properties["telephoneNumber"].Value = oRow["Dorm_Ext"].ToString();

if (oRow["Dorm_Ext"].ToString() != user.Properties["telephoneNumber"].ToString())

user.Properties["telephoneNumber"].Value = oRow["Dorm_Ext"].ToString();

if (HashSSN(oRow["SSN"].ToString()) != user.Properties["employeeNumber"].ToString())

user.Properties["employeeNumber"].Value = HashSSN(oRow["SSN"].ToString());