File copy using robo copy and process

Question

I am creating a File copy program which will copy large number of files(~100,000) with size ~50 KB using ROBOCOPY command.

For each file, I am creating a new process an

Answer 1

.cmd has following lines

Start ROBOCOY src dest a* b* c*    /z /w:1 r:1
Start ROBOCOY src dest d* e* f* g* /z /w:1 r:1
Start ROBOCOY src dest h* K* P* Y*  /z /w:1 r:1
Start ROBOCOY src dest xry* srp*  /z /w:1 r:1

When I run > Robocopy sample.cmd I starts with 4 multiple windows copying files simultaneously as per above commands, it waits for another file, as it has wait time, if file is being used by another process. Is is more faster as it do job simultaneously.

Now I am developing GUI using C# windows to run the process instead going to command console and
start

  main()
  { 
  process.start( "path of sample.cmd" )
  process.waitforexit()
  label.text=" sucessful copy"
  }

However, if it takes control of one process, i.e. cmd.exe and and there are 4 robocopy processes in taskmanager. when cmd.exe process completes, it returns the cursor to label.text "Sucesssfully completed". While there are robocopy processes still running. you can see the robocopy windows doing the copying process.

Here is the question: I want to take control of all the processes (cmd.exe and robocopy.exe) programatically in C#, so that when the label.text should display "successfully completed" only when all commands are successfully completed", if one fails, then there is no point in the GUI.

option 2 (similar to Biju has written above): is it better to remove robocopy command scripts from sample.cmd(batch file) file and write code to run the 4 robocopy lines in C#, but how to run the robocooy script line written .cmd file, as they have arguments as well. I code runs each robocopy process then each will return to the next line of code and if it fails, we can catch the error and display in the message box.

Hope this will help... However, I am looking for more better way, if somebody can improve on the same.