Web Forms :: System Cannot Find The File Specified Exception

At the time of executing below code it gives exception as file not specified for the line p.start(). The target directory and file name is correct.

Process p = new Process();
string targetDir = string.Format(@"C:UsersAdminDesktopRahulLatest ETLETL Working Copy 20101810ETL Working Copy 20101810SchedulerScript Input") ;
p.StartInfo.WorkingDirectory = targetDir;
p.StartInfo.FileName = "ShellScript_" + shedule.CC_ETL_SCHEDULE_ID + ".bat";
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.RedirectStandardError = true;
p.Start();
string res=p.StandardOutput.ReadLine();
string output = p.StandardOutput.ReadToEnd();
[code]...