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copied!<p>You can use the <a href="http://msdn.microsoft.com/en-us/library/aa394372%28VS.85%29.aspx" rel="nofollow noreferrer">Win32_Process</a> class from the WMI to get all the info related to a process.</p> <p>check this sample </p> <pre><code>using System; using System.Collections.Generic; using System.Diagnostics; using System.Management; using System.Text; namespace ConsoleApplication2 { class Program { public static string GetProcessOwner(int PID, out string User) { string DummyStr = String.Empty; User = String.Empty; string ProcessStr = String.Empty; try { ObjectQuery WMIQuery = new ObjectQuery(string.Format("Select * from Win32_Process Where ProcessID ={0}", PID.ToString())); ManagementObjectSearcher WMIResult = new ManagementObjectSearcher(WMIQuery); if (WMIResult.Get().Count == 0) return DummyStr; foreach (ManagementObject oItem in WMIResult.Get()) { string[] List = new String[2]; oItem.InvokeMethod("GetOwner", (object[])List); ProcessStr = (string)oItem["Name"]; User = List[0]; if (User == null) User = String.Empty; string[] StrSID = new String[1]; oItem.InvokeMethod("GetOwnerSid", (object[])StrSID); DummyStr = StrSID[0]; return DummyStr; } } catch { return DummyStr; } return DummyStr; } static void Main(string[] args) { string User; Process[] processList = Process.GetProcesses(); foreach (Process p in processList) { GetProcessOwner(p.Id,out User); Console.WriteLine(p.Id.ToString()+' '+User); } Console.ReadLine(); } } } </code></pre> <h2>UPDATE</h2> <p>also you can store in a Dictionary the owners and the pid, for improve the performance.</p> <pre><code>using System; using System.Diagnostics; using System.Management; using System.Text; using System.Collections.Generic; namespace ConsoleApplication2 { class Program { public static Dictionary<int, string> GetAllProcessOwners() { Dictionary<int, string> d = new Dictionary<int, string>(); //string DummyStr = String.Empty; string User = String.Empty; string ProcessStr = String.Empty; try { ObjectQuery WMIQuery = new ObjectQuery("Select * from Win32_Process"); ManagementObjectSearcher WMIResult = new ManagementObjectSearcher(WMIQuery); if (WMIResult.Get().Count == 0) return d; foreach (ManagementObject oItem in WMIResult.Get()) { string[] List = new String[2]; oItem.InvokeMethod("GetOwner", (object[])List); ProcessStr = (string)oItem["Name"]; User = List[0]; if (User == null) User = String.Empty; //string[] StrSID = new String[1]; //oItem.InvokeMethod("GetOwnerSid", (object[])StrSID); //DummyStr = StrSID[0]; d.Add(Convert.ToInt32(oItem["ProcessId"]), User); } } catch (Exception E) { Console.WriteLine(E.Message); return d; } return d; } static void Main(string[] args) { Dictionary<int, string> List = GetAllProcessOwners(); Process[] processList = Process.GetProcesses(); foreach (Process p in processList) { if (List.ContainsKey(p.Id)) { Console.WriteLine(p.Id.ToString() + ' ' + List[p.Id]); } } Console.ReadLine(); } } } </code></pre>

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