How do you create and store codes such as methods in a new .cs file (Request.cs) and then call the code in there on an event on a form?

Create your file and, assuming you are using instance members (as opposed to static) you would do something like:

private void btn_click(Object sender, EventArgs e)
{
     Request rq = new Request();
     rq.someMethod();
}

using static members:
private void btn_click(Object sender, EventArgs e)
{
     Request.someStaticMethod();
}

hth.

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You can't just create functions, you need to create them as methods in a class. In Request.cs create a public class called Request. Add some methods such as DoSomething(). If they are declared as static methods then you can call Request.DoSomething() from your form. If they are instance methods you need to instantiate a Request object:--

Joe (Microsoft MVP - XML)