The below extension method will help us to convert a generic list to DataTable

public static class DataTableExtension
    {
        public static DataTable ToDataTable<T>(this List<T> list)
        {
            Type type = typeof(T);
            DataTable dt = new DataTable(type.Name);

            var propertyInfos = type.GetProperties().ToList();

            //For each property of generic List (T), add a column to table
            propertyInfos.ForEach(propertyInfo =>
                {
                    Type columnType = Nullable.GetUnderlyingType(propertyInfo.PropertyType) ?? propertyInfo.PropertyType;
                    dt.Columns.Add(propertyInfo.Name, columnType);
                });


            //Visit every property of generic List (T) and add each value to the data table 
            list.ForEach(item =>
                {
                    DataRow row = dt.NewRow();
                    propertyInfos.ForEach( 
                                           propertyInfo => 
                                           row[propertyInfo.Name] = propertyInfo.GetValue(item, null) ?? DBNull.Value
                                         );
                    dt.Rows.Add(row);
                });

            //Return the datatable
            return dt;
        }
    }

class Program
    {
        static void Main(string[] args)
        {
            List lstString = new List<Person>();
            Enumerable.Range(1, 10).ToList().ForEach(i => lstString.Add(
                            new Person { PersonId = i
                                        , PersonName = string.Concat("Name", i) 
                                        , Sex = i%2 ==0 ? "M":"F"
                                        , Salary  = 100 + i
                            }));

            var res = lstString.ToDataTable();
        }
    }

    public class Person
    {
        public int PersonId { get; set; }
        public string PersonName { get; set; }
        public string Sex { get; set; }
        public decimal Salary { get; set; }
    }

Hope this helps