public static DataTable ToDataTable<T>(IEnumerable<T> input, string tableName)        {            var dt = new DataTable();            dt.TableName = tableName;

            var first = Enumerable.First(input);

if (first is System.Dynamic.DynamicObject)            {                IDictionary<string, object> properties = (IDictionary<string, object>)first;

foreach (var p in properties)                {                    var type = p.Value.GetType();if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))                        type = type.GetGenericArguments()[0];

                    dt.Columns.Add(p.Key, type);                }

foreach (T r in input)                {                    var values = new object[properties.Count];int i = 0;foreach (var p in properties)                    {                        values[i] = (r as IDictionary<string, object>)[p.Key];                        i++;                    }

                    dt.LoadDataRow(values, true);                }            }

else            {                var properties = typeof(T).GetProperties();

foreach (var p in properties)                {                    var type = p.PropertyType;if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))                        type = type.GetGenericArguments()[0];

                    dt.Columns.Add(p.Name, type);                }

foreach (T r in input)                {                    var values = new object[properties.Length];int i = 0;foreach (var p in properties)                    {                        values[i] = p.GetValue(r, null);                        i++;                    }

                    dt.LoadDataRow(values, true);                }            }return dt;        }