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using System.Diagnostics;

...

//Declare and instantiate a new process component.
System.Diagnostics.Process process;
process = new System.Diagnostics.Process();

System.Diagnostics.Process.Start("updater.exe", "/checknow");
process.Close();

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    // check for updates on the website
    // The updater.exe program must be in the APPDIR sitting next to main.exe
    //Declare and instantiate a new process component. 
    string path =  "updater.exe";

    if (File.Exists (path)) {
        System.Diagnostics.Process process;
        process = new System.Diagnostics.Process ();
        System.Diagnostics.Process.Start (path, "/checknow /silent");
        process.Close ();
    }
    else {
        MessageBox.Show ("Can't see the updater.exe program");
    }

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System.Diagnostics.Process.Start (path, "/silent");

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        private void button2_Click(object sender, EventArgs e)
        {
            Process process = Process.Start(updaterModulePath, "/justcheck");
            process.WaitForExit();
           
            if (process.ExitCode == 0)
            {
                MessageBox.Show("Update found!");
                process.Close();
            }
        }