Check out example codes for "easily start admin process from service c#". It will help you in understanding the concepts better.

Code Example 1

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

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