FileUpload上传图片保存到SQL数据库image字段

if (upImage.PostedFile != null)
            {
                string lName = upImage.PostedFile.FileName;

                if (lName != "")
                {
                    string tarPath = sysFunc.systemFound() + "FilesLib\\temp\\" + userID + "." + kzm;
                    upImage.PostedFile.SaveAs(tarPath);

                    try
                    {
                        opData.ExecuteSql(sysConst.SysteminfoCon, "delete from tFile_Img_Temp where userID=" + userID);

                        FileStream fs = new FileStream(tarPath, FileMode.Open);    //文件流
                        byte[] xpIMG = new byte[fs.Length];  //设定字节流数组大小
                        BinaryReader br = new BinaryReader(fs);      //读字节对象
                        xpIMG = br.ReadBytes(Convert.ToInt32(fs.Length));
                        br.Dispose();
                        fs.Dispose();
 
                        SqlConnection conn = new SqlConnection(sysConst.SysteminfoCon);
                        conn.Open();

                        String sqlcmd = "insert into tFile_Img_Temp (imgMain) values (@imgMain)";
                        SqlCommand CmdObj = new SqlCommand(sqlcmd, conn);

                        SqlParameter ImageMain = new SqlParameter();
                        ImageMain.ParameterName = "@imgMain";
                        ImageMain.SqlDbType = SqlDbType.Image;
                        ImageMain.Value = xpIMG;