how to bind list items to datagridview

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C#5.0

i am having a list populated from a database, i want to bind this list to a datagrid, any

assistance will be appreciated. below is my code:

 public List<string> listUserNameDuplicate = new List<string>();
 public List<string> listUserName = new List<string>();
while (reader.Read())
                {
                    
                    listUserName.Add(reader["FirstName"].ToString().ToUpper());
                    listUserNameDuplicate.Add(reader["LastName"].ToString().ToUpper());
                    listUserNameDuplicate.Add(reader["FirstName"].ToString().ToUpper());
                    listUserNameDuplicate.Add(reader["MiddleName"].ToString().ToUpper());
                    listUserNameDuplicate.Add(reader["ClassName"].ToString().ToUpper());
                   
               }

i am calling the list in this way:

listBoxDuplicate.DataSource = Wr.listUserNameDuplicate.ToList();

it displays the list items in one row only, and they are all integer values, i want to display Firstname, LastName,MiddleName,ClassName as header text in the datagrid and their

corresponding records below.


And i also want to check whether the listUserName contains more than one username.

Any assistance will be appreciated. Thanks in advance.