c# – 文件上传控件无法返回正确的内容..附加字符正在追加

实际的文件内容是

CREATE PROCEDURE dbo.ws_Device_Update
(
    @ApplicationId uniqueidentifier,@OriginalApplicationId uniqueidentifier,@DeviceIMEI nvarchar (50),@OriginalDeviceIMEI nvarchar (50),@ModelId int,@DeviceName nvarchar (50),@DeviceDescription nvarchar (255),@DeviceState int,@IsExpired bit,@IsSuspended bit,@LastAccessed datetime,@ClientSeqNo bigint,@ServerSeqNo bigint,@ModelCode varchar (50),@PushToken varchar (512),@PushLastAlive datetime,@PushLastDead datetime,@DeviceType int   
)
AS

我正在使用以下程序

int fileLength = fileUpload.PostedFile.ContentLength;            
Byte[] contentInBytes = new Byte[fileLength];
using (Stream streamContent = fileUpload.FileContent)
{
  streamContent.Read(contentInBytes,fileLength);
}
var xx = ASCIIEncoding.ASCII.GetString(contentInBytes);

我得到的输出是

???CREATE PROCEDURE dbo.ws_Device_Update
(
    @ApplicationId uniqueidentifier,@DeviceType int   
)
AS

一些额外的???人物来了……我不知道从哪里来？

生成的字节数组是

239,187,191,67,82,69,65,84,32,80,79,68,85,100,98,111,46,119,115,95,101,118,105,99,112,97,116,13,10,40,9,64,108,110,73,117,113,102,114,44,103,77,104,53,48,41,78,109,50,83,120,76,107,49,121,83

我不知道“239,191”来自哪里……任何关于如何解决这个问题的线索？

谢谢