string script = System.IO.File.ReadAllText(@"C:UsersBobDesktopCallPS.ps1");

    using (Runspace runspace = RunspaceFactory.CreateRunspace())
    {
        runspace.Open();
        using (Pipeline pipeline = runspace.CreatePipeline(script))
        {
            Command c = new Command("BatAvg",false);
            c.Parameters.Add("Name", "John");
            c.Parameters.Add("Runs", "6996");
            c.Parameters.Add("Outs", "70");
            pipeline.Commands.Add(c);

            Collection<PSObject> results = pipeline.Invoke();
            foreach (PSObject obj in results)
            {
                // do somethingConsole.WriteLine(obj.ToString());
            }
        }
    }

Function BatAvg
{
    param ($Name, $Runs, $Outs)
    $Avg = [int]($Runs / $Outs*100)/100
    Write-Output "$Name's Average = $Avg, $Runs, $Outs "
}

using (Runspace runspace = RunspaceFactory.CreateRunspace())
        {
            runspace.Open();
            PowerShell ps = PowerShell.Create();
            ps.Runspace = runspace;
            ps.AddScript(script);
            ps.Invoke();
            ps.AddCommand("BatAvg").AddParameters(new Dictionary<string, string>() {
                {"Name" , "John"}, {"Runs", "6996"}, {"Outs","70"}
            });
            foreach (PSObject result in ps.Invoke())
            {
                Console.WriteLine(result);
            }
        }

var ps = PowerShell.Create();
ps.AddScript(script);
ps.Invoke();
ps.AddCommand("BatAvg").AddParameters(new Dictionary<string, string>
{
     {"Name" , "John"}, {"Runs", "6996"}, {"Outs","70"}
});
foreach (var result in ps.Invoke())
{
     Console.WriteLine(result);
}