Function creation with C#script

I'm new to c# and I used to use winrunner before HP days and one thing I used in functions were the parameters to push in so that when the function ran it would set the text value as to what I passed into the function call. essentially I need to find out first how that part of the function is created

function main() 

{


    var User1 = "testuser";


    var Pass1 = "testpass";


    Login(User1, Pass1);


}



function Login(user, password)


{


    //...


    form = page["table"]["cellSmall"]["table"]["formLogin"];


    textbox = form["cellSmall"]["textboxUserName"];


    textbox["Click"](16, 11);


    textbox["Text"] = user;   


    form["cell"]["passwordboxPassword"]["Text"] = password;