**#This is sample PowerShell function**

function Add-num {

param($int1,$int2)

Write-Host ($int1 + $int2)

}


**#This is my c# code**

 class Program
    {

        static void Main(string[] args)
        {
            String file = @"E:powershellUntitled3.ps1";

            Runspace runspace = RunspaceFactory.CreateRunspace();
            runspace.Open();

            using (PowerShell PowerShellInstance = PowerShell.Create())
            {
                PowerShellInstance.AddScript(file);
                PowerShellInstance.AddCommand("Add-num").AddParameters(new Dictionary<string, string>
                {
                    {"int1","6" },
                    {"int2","7" }
                });






               // Collection<PSObject> PSOutput = PowerShellInstance.Invoke();

                foreach (PSObject outputItem in PowerShellInstance.Invoke())
                {
                    Console.WriteLine(outputItem.BaseObject);
                }
                runspace.Close();
        }
    }
}