C#

I am trying to get my head around LINQ and am going through some old code to practice, below is some code that i want to convert but cannot work out how to do it.
anyone have any ideas please.
Reading a csv file, getting first element only with some blank lines and should be able to populate combobox with something like:
cboSiteLocation.Items.AddRange(lines.ToArray());

using (StreamReader sr = new StreamReader(filepath)) 
                {
                    IEnumerable<string> lines = File.ReadLines(filepath); // LINQ query here
                    
                    string[] element;

                    foreach (string line in lines)
                    {
                        if (!string.IsNullOrEmpty(line))
                        {
                            element = line.Split(',');
                            this.cboSiteLocation.Items.Add(element[0].Trim());
                        }
                    }                    
                }
   
Thanks in advance

<double xmlns="http://www.somewebservice.com/">168.0543</double>