สอบถามเรื่อง ProcessStartInfo("cmd.exe"); ไม่ทำงาน กับ client

 public void Compile()
         {

             String strSQL = @"  SELECT  Course_ID
                            FROM    HW
                            where HW_Name = " + "'" + DropDownList1.Text + "'";

             SqlDataReader sdr1 = clsDB.QueryDataReader(strSQL);
             sdr1.Read();
             String Course_ID = sdr1["Course_ID"].ToString();
             clsDB.Close();

             DirectoryInfo myDirInfo;
             DirectoryInfo myDirInfo2;
             DirectoryInfo[] arrFolderInfo;
             myDirInfo = new DirectoryInfo(Server.MapPath("~/Storage_File/Teacher/" + User.Identity.Name + "/" + Course_ID + "/"));
             arrFolderInfo = myDirInfo.GetDirectories("*");
             
             
             


             foreach (DirectoryInfo myFolderInfo in arrFolderInfo)
             {
                 try
                 {
                     string filenameCompile = DropDownList1.Text + "_" + myFolderInfo.Name + ".cpp";
                     string filenameCompile_2 = DropDownList1.Text + "_" + myFolderInfo.Name;
                     string ShowResult = DropDownList1.Text + "_" + myFolderInfo.Name + ".exe";
                     string Output = DropDownList1.Text + "_" + myFolderInfo.Name + ".txt";
                     string StudentID = myFolderInfo.Name;


                     System.Diagnostics.ProcessStartInfo si = new System.Diagnostics.ProcessStartInfo("cmd.exe");
                     si.RedirectStandardInput = true; si.RedirectStandardOutput = true; si.RedirectStandardError = true; si.UseShellExecute = false; si.CreateNoWindow = true;
                     System.Diagnostics.Process console = System.Diagnostics.Process.Start(si);
                     console.StandardInput.WriteLine(@"C:");
                     console.StandardInput.WriteLine(@"cd " + (Server.MapPath("~/Storage_File/Teacher/" + User.Identity.Name + "/" + Course_ID + "/" + myFolderInfo.Name + "/" + DropDownList1.Text + "/")));
                     console.StandardInput.WriteLine(@"g++ " + filenameCompile + " -o " + filenameCompile_2);
                     System.Threading.Thread.Sleep(1000);
                     //console.StandardInput.WriteLine(@"" + ShowResult + ">" + Output);
                     console.StandardInput.WriteLine(@"exit");
                     System.Threading.Thread.Sleep(1000);



                     



                     myDirInfo2 = new DirectoryInfo(Server.MapPath("~/Storage_File/Teacher/" + User.Identity.Name + "/" + Course_ID + "/" + myFolderInfo.Name + "/" + DropDownList1.Text + "/"));

                     FileInfo[] arrFileInfo;


                     arrFileInfo = myDirInfo2.GetFiles("*.exe");



                     foreach (FileInfo myFileInfo in arrFileInfo)
                     {


                         if (myFileInfo.Name == ShowResult)
                         {

                             String strSQL1 = @"  INSERT INTO Check_Compile
                            (StudentID,HW_Name,Compile)
                            VALUES     ('" + StudentID + "', '" + DropDownList1.Text + "', '" + "ผ่าน" + "')";

                             clsDB.QueryExecuteNonQuery(strSQL1);
                             clsDB.Close();

                         }


                     }
                 }
                 // Modify
                 catch (System.IO.IOException e)
                 {

                 }


             }

             String strSQL2 = @"  INSERT INTO Check_Compile (StudentID,HW_Name,Compile)
                               select Enroll.Student_ID ,'" + DropDownList1.Text + "','ไม่ผ่าน' FROM Enroll WHERE Enroll.Student_ID NOT IN(select Check_Compile.StudentID from Check_Compile where HW_Name = " + "'" + DropDownList1.Text + "'" + ")";
             clsDB.QueryExecuteNonQuery(strSQL2);
             clsDB.Close();

         }