Some clarification needed please. C#

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C#

Now that I have the c#-script running that returns the all the windows users. Some clarifications is needed please. It does return all the Windows users names. 8 to be exact. There should only be 4, user1, user2, user3, user4. It also returns names like
"administrator", defaultaccount, defaultuser1, and last: "WDagutilityaccount"; which I don't really know why it returns these 4. Is there some clarifications that I put on that it only returns the four(4) usernames only??? There's a little of bit of behind the senses that's not documented that gets 'using system.management' going. But any rate, I just want the usernames only, not these other junknames. Any insights sure would be helpful.
Thanks,

Some sentence corrections.

What I have tried:

I'm using this script:

            ///            ManagementScope mgmtScope = new ManagementScope("\\\\.\\Root\\CIMv2");
            ObjectQuery oQuery = new ObjectQuery("SELECT * FROM Win32_UserAccount");   ////  Where Name=\"myUserName\"");
            ManagementObjectSearcher mgmtSearch = new ManagementObjectSearcher(oQuery);  //// (mgmtScope, oQuery);
            ManagementObjectCollection objCollection = mgmtSearch.Get();
            foreach (ManagementObject mgmtObject in objCollection)
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