XmlDocument.load 读文件报异常：文件正被其它线程使用，解决方法

string filePath = Form1.getProjectFilePath();
            System.Xml.XmlDocument xmlDoc = new System.Xml.XmlDocument();
            //xmlDoc.Load(filePath);
            using (System.IO.FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
            {
                using (System.IO.StreamReader sr = new StreamReader(fs, Encoding.GetEncoding(936)))
                {
                    var strXml = sr.ReadToEnd();
                    xmlDoc.LoadXml(strXml);
                }
            }

protected void abcBankPayment(string no, string amount, string productName, string qcode)
        {
            var buildingName = productName.Split(‘:‘)[0];
            var bean = new ABCBankAccountBean();
            DataContractJsonSerializer jsonSerial = new DataContractJsonSerializer(typeof(ABCBankAccountBean));
            var result = File.ReadAllText(MapPath("~/Finance/ABCBankAccountMaping.json"), System.Text.Encoding.UTF8);
            using (MemoryStream stream = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(result)))
            {
                bean = (ABCBankAccountBean)jsonSerial.ReadObject(stream);
            }
            Building entityBuilding = bean.buildingItems.Where(exp => exp.buildingNames.Contains(buildingName)).FirstOrDefault();
            if (entityBuilding == null)
            {
                //楼盘没有农行支付配置
                getMsgLabel().Text = string.Format("楼盘‘{0}‘不能使用农行接口支付", buildingName);
                return;
            }
}