How to start a Process as administrator mode in C# [duplicate]

I have a Visual Studio Windows app project. I've added code to download an installer update file. The installer after it has finished downloading would need administrator privileges to run. I have added a manifest file.

When user clicks on the DownloadUpdate.exe, UAC prompts the user for Admin permissions. So I assumed that all processes created and called within DownloadUpdate.exe will run in admin capacity. So I made the setup call my downloaded file with the following code:

Process p = new Process();
p.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
p.StartInfo.FileName = strFile;
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.RedirectStandardError = true;

Try this:

//Vista or higher check
if (System.Environment.OSVersion.Version.Major >= 6)
{
   p.StartInfo.Verb = "runas";
}

Alternatively, go the manifest route for your application.

First of all you need to include in your project

using System.Diagnostics;

After that you could write a general method that you could use for different .exe files that you want to use. It would be like below:

public void ExecuteAsAdmin(string fileName)
{
    Process proc = new Process();
    proc.StartInfo.FileName = fileName;
    proc.StartInfo.UseShellExecute = true;
    proc.StartInfo.Verb = "runas";
    proc.Start();
}

If you want to for example execute notepad.exe then all you do is you call this method:

ExecuteAsAdmin("notepad.exe");

var pass = new SecureString();
pass.AppendChar('s');
pass.AppendChar('e');
pass.AppendChar('c');
pass.AppendChar('r');
pass.AppendChar('e');
pass.AppendChar('t');
Process.Start("notepad", "admin", pass, "");

Works also with ProcessStartInfo:

var psi = new ProcessStartInfo
{
    FileName = "notepad",
    UserName = "admin",
    Domain = "",
    Password = pass,
    UseShellExecute = false,
    RedirectStandardOutput = true,
    RedirectStandardError = true
};
Process.Start(psi);