How to update value of a "usercert" property in LDAP AD - active-directory

Question

I have a requirement where I need to update the value saved in the property ("usercert") of a computer present in active directory.
// Retrieving properties value from AD
DirectoryEntry entry = new DirectoryEntry(LDAPPath, LDAPUser, DecryptPwd(LDAPPwd, LDAPKey));
DirectorySearcher searcher = new DirectorySearcher(entry);
searcher.Filter = string.Format("(&(objectCategory=computer)(Name=" + MachineName + "))");
result = searcher.FindOne();
byte[] text= (byte[])result.GetDirectoryEntry().Properties["usercert"].Value;
// Updateing new value to AD string updatedText= "New Text";
if (result.GetDirectoryEntry().Properties["usercert"] != null &&
result.GetDirectoryEntry().Properties["usercert"].Value != null)
{
byte[] updatedTextByte = Encoding.ASCII.GetBytes(updatedText);
result.GetDirectoryEntry().InvokeSet("usercert", updatedPassByte);
//(result.GetDirectoryEntry().Properties["usercert"]).Value = Encoding.ASCII.GetBytes(updatedText);
//result.GetDirectoryEntry().Properties["usercert"].Add(Encoding.ASCII.GetBytes(updatedText));
//result.GetDirectoryEntry().Properties["usercert"][0] = Encoding.ASCII.GetBytes(updatedText);
result.GetDirectoryEntry().CommitChanges();
}
I tried with all of the above commented code but nothing works for me. Can you please help me to solve this issue.

Answer 1

Calling GetDirectoryEntry() creates a new DirectoryEntry object each time you call it, which you can see in the source code here.
So when you do this:
result.GetDirectoryEntry().CommitChanges();
It's creating a brand new DirectoryEntry object and calling CommitChanges() on that. So nothing is changed.
You will need to call GetDirectoryEntry() only once and make changes to that object. For example:
var resultDe = result.GetDirectoryEntry();
resultDe.Properties["usercert"]).Value = whatever;
resuleDe.CommitChanges();