SQL Query - Distinct with Concatenated Columns

Good Day Experts!

I am in need of assistance with a SQL query for use in my VB.net application.  I am getting first name and last name from seperate columns in a table. Then I had to concatenate the two seperated by a comma to show Last, First in my combo box.  

The trouble lies in the SQL table...there are at times 2 records with the same first and last name as a result of DataEntry duplication.  So, I am seeing 2 rows of Smith, Bob in my combobox.  

How can I get only one to be returned back in my query results? I tried looking at Distinct but could not get it to work.  

Here is my query that works but shows duplicates:

Select lname + ',' + fname as name from Login where corporation like '%Contech%'
                                        order by name asc

Thanks,
jimbo99999