C#

Q7. (Note: You cannot answer Questions 8, 11 and 14 if you are answering this question. Pick another 2 from the rest).
Write a command-line program as follows:

First the program will take as input a +ve integer from the user, let's call it
the TARGET.

It will then take in a set of +ve integers from the user, and here the user gets
to specify how many integers he/she wants to enter. Let's call this set the
RANGE.

Now the program should compute as follows:

- Find all combinations in the RANGE, the sum of which add up to the
  target. Print such combinations at the command prompt. In a combination,
  repeats are not allowed. i.e. (x + x + y) = TARGET is forbidden. Every element
  in the combination must be unique.

- In case a user enters a RANGE element greater than the target, it should be immediately
  discarded and the user must be prompted for the element again.
  
- Order shifted cases don't count. i.e. (x+y) and (y+x) being printed
  separately is unnecessary and MUST be avoided.
  
- In case no combinations exist, the program should report so.

- Add exception handling code where necessary.

Example Run:

Enter Target: 15
How many set elements?: 5
Enter Element1: 7
Enter Element2: 8
Enter Element3: 12
Enter Element4: 3
Enter Element5: 22
Sorry. That element is larger than your target. Try again.
Enter Element5: 4

Combinations are:
1] 7+8
2] 8+3+4
3] 12+3

Time: 45 mins.

(At the top of the source file, please comment in your ID details along with the reference number at the back of the day-card you were provided by the examiner. Write your Full Name, ID key, TDC number and most importantly the reference number. Good luck.)

private void cmdLesen_Click(object sender, EventArgs e)
{
    ProcessStartInfo start = new ProcessStartInfo();
    start.FileName = "upx.exe";
    start.RedirectStandardError = true;
    start.RedirectStandardOutput = true;
    start.UseShellExecute = false;
    Process prozess = Process.Start(start);
    prozess.WaitForExit();
    string consolenText = prozess.StandardOutput.ReadToEnd();
    string consolenText2 = prozess.StandardError.ReadToEnd();
    rtfBox.Text = consolenText2;
}