How to convert list to datatable C#

i have to loop in page and get data from html table i get all the data in a list each time i loop and get them into list how can i pass them to data table where all the rows of the list has only one column and different in values ?? i try to convert them to dictionary and pass them to data table but i have get error duplicate column ?? this is my code

What I have tried:

List<string> list = new List<string>();
                        if (pagevalue != null)
                        {
                           
                           
                            foreach (HtmlNode data in pagevalue.DocumentNode.SelectNodes("//div"))
                            {
                                  list.Add(infodata.InnerText);
                            }

                            if (list.Count > 0)
                            {

                                var dict = list.ToDictionary(k => k, v => v);

                                foreach (KeyValuePair<string, string> item in dict)
                                {
                                    DataRow dataRow = dt.NewRow();
                                    dt.Columns.Add(item.Key);
                                }

                                DataSet ds = new DataSet();
                                ds.Tables.Add(dt);
                            }