Getting list of running processes on my comp

Hey there, so basicly I'm writing a little application that will kill some processes and some junk programs running in the background. Yea i know this can be done in task manager aswell, but I want to learn ^^.

So, I want a button called "Get all running proccesses", when u click that button all processes should get added to a dropdown box, so the user can select the process in the dropdown menu. right now i got this command:

Code:

foreach (System.Diagnostics.Process p in System.Diagnostics.Process.GetProcessesByName(textBox1.Text))
            {
                try
                {
                    p.Kill();
                    p.WaitForExit();
                    progressBar1.Value = 100;
                    label1.ForeColor = System.Drawing.Color.Green;
                    label1.Text = "Process Successfully Killed";
                    timer1.Start();
                    textBox1.ResetText();
                }
                catch (Win32Exception)
                {

                }
                catch (InvalidOperationException)
                {

                }

it will kill the text entered in the textbox, so i just want to replace the text box with a dropdown menu :P, any thoughts on how i could do this?

Edit: also, is there any way i can make label1 it say "couldnt find process" or something similar if it could find the process?

Kind Regards
-Jazerix