DataTableToJSON

private static string DataTableToJSON(DataTable table)
{
var list = new List<Dictionary<string, object>>();

        foreach (DataRow row in table.Rows)
        {
            var dict = new Dictionary<string, object>();

            foreach (DataColumn col in table.Columns)
            {
                dict[col.ColumnName] = row[col];
            }
            list.Add(dict);
        }

        JavaScriptSerializer serializer = new JavaScriptSerializer();
        serializer.MaxJsonLength = 1024000000;
        string str = serializer.Serialize(list);
        return str;
    }