C# : Not showing all processes in list

I've created a small app to show top 10 processes by working set size.
My problem is that it does not show the correct top 10 list.
The attached code is what I wrote. When I compare my list with task manager process list, the result are not the same.
In the task manager I see processes not listed in my list. for example the 'dwm' process is missing from my list.
but when I use :
Process[] processList = Process.GetProcessesByName("dwm");
the process is shown in the list

string[] TopTenName = new string[10];
        long[] TopTenVal = new long[10];

        private void Form1_Load(object sender, EventArgs e)
            Process[] processList = Process.GetProcesses();

            string _Break;
            int _TopTenCount;
            foreach (Process p in processList)
                _Break = "No";
                _TopTenCount = 0;
                while (_Break == "No")
                    if (TopTenVal[_TopTenCount] < (p.WorkingSet64 / 1024))
                        TopTenName[_TopTenCount] = p.ProcessName;
                        TopTenVal[_TopTenCount] = p.WorkingSet64 / 1024;
                        _Break = "Yes";
                    if (_TopTenCount == 10) _Break = "Yes";

            ListViewItem lvName;
            ListViewItem lvVal;


            for (int n = 0; n < 10; n++)
                lvName = new ListViewItem();
                lvVal = new ListViewItem();

                lvName.Text = TopTenName[n];
                lvVal.Text = TopTenVal[n].ToString("0,0");


            listView1.View = View.Details;

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käµfm³d 👽Commented:
Use the overloaded version of GetProcesses as below. I can't find the question I saw this on before, but there is a reason you have to do it this way and I cannot remember what it was :\
Process[] processList = Process.GetProcesses(Environment.MachineName);

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käµfm³d 👽Commented:
I believe this also works:
Process[] processList = Process.GetProcesses(".");

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OrenRozenAuthor Commented:
both suggestions didn't solve the issue.
another thing I didn't mention is that I'm running in 64 bit environment. don't no why it should matter, but...

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käµfm³d 👽Commented:
Maybe I'm confusing that with something else then :\

Are you compiling the code as x86 or x64?
OrenRozenAuthor Commented:
same results for x86 and x64. default is Any CPU.

what puzzles me is why the code (when using GetProcesses()) is not showing the 'dwm' process in the list while when using GetProcessesByName("dwm")
is (and the only) showing in the list.
BTW, the 'dwm' process is the third in memory size.
OrenRozenAuthor Commented:
no more ideas?

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