Var To DataTable

public static DataTable CopyToDataTable<T>(this IEnumerable<T> array)
        {
            var ret = new DataTable();
            foreach (PropertyDescriptor dp in TypeDescriptor.GetProperties(typeof(T)))
            {
                //if (!dp.IsReadOnly)
                {
                    ret.Columns.Add(dp.Name, dp.PropertyType);
                }
            }
            foreach (T item in array)
            {
                var Row = ret.NewRow();
                foreach (PropertyDescriptor dp in TypeDescriptor.GetProperties(typeof(T)))
                {
                    //if (!dp.IsReadOnly)
                    {
                        Row[dp.Name] = dp.GetValue(item);
                    }
                }
                ret.Rows.Add(Row);
            }
            return ret;
        }
        static public DataTable ToDataTable<T>(this IEnumerable<T> varlist)
        {

            DataTable dtReturn = new DataTable();

            // column names

            PropertyInfo[] oProps = null;

            // Could add a check to verify that there is an element 0

            foreach (T rec in varlist)
            {

                // Use reflection to get property names, to create table, Only first time, others will follow

                if (oProps == null)
                {

                    oProps = ((Type)rec.GetType()).GetProperties();

                    foreach (PropertyInfo pi in oProps)
                    {

                        Type colType = pi.PropertyType; if ((colType.IsGenericType) && (colType.GetGenericTypeDefinition() == typeof(Nullable<>)))
                        {

                            colType = colType.GetGenericArguments()[0];

                        }

                        dtReturn.Columns.Add(new DataColumn(pi.Name, colType));

                    }

                }

                DataRow dr = dtReturn.NewRow(); foreach (PropertyInfo pi in oProps)
                {

                    dr[pi.Name] = pi.GetValue(rec, null) == null ? DBNull.Value : pi.GetValue(rec, null);

                }

                dtReturn.Rows.Add(dr);

            }

            return (dtReturn);

        }