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//check if admin, if not run as admin :
WindowsIdentity windowsIdentity = WindowsIdentity.GetCurrent();
WindowsPrincipal windowsPrincipal = new WindowsPrincipal(windowsIdentity);
if (!windowsPrincipal.IsInRole(WindowsBuiltInRole.Administrator))
{
if (MessageBox.Show(Resource1.adminQuestion, Text, MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
{
ProcessStartInfo startInfo = new ProcessStartInfo();
startInfo.UseShellExecute = true;
startInfo.WorkingDirectory = Environment.CurrentDirectory;
startInfo.FileName = Application.ExecutablePath;
startInfo.Verb = "runas";
Process.Start(startInfo);
this.Close();
Application.Exit();
}
}
Start a 3rd app as admin https://stackoverflow.com/questions/2532769/how-to-start-a-process-as-administrator-mode-in-c-sharp
Manifest use https://stackoverflow.com/questions/2818179/how-do-i-force-my-net-application-to-run-as-administrator
add the manifest file to your PRJ. when build embedded to exe, no need to copy near exe. valid manifest to require admin rights on run is :
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//src - https://victorhurdugaci.com/using-uac-with-c-part-2
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestversion="1.0">
<assemblyidentity version="1.0.0.0" processorarchitecture="X86" name="UACApp" type="win32"></assemblyidentity>
<trustinfo xmlns="urn:schemas-microsoft-com:asm.v3">
<security>
<requestedprivileges>
<requestedexecutionlevel level="requireAdministrator"></requestedexecutionlevel>
</requestedprivileges>
</security>
</trustinfo>
</assembly>
if for any reason when you starting the exe, an error appears, you can view the debug at : See MyComputer > rclick > Manage > Event Viewer > Windows Logs > Application
the levels explained : 
origin - http://www.pipiscrew.com/?p=6908 run-as-administrator