Listing 5: Adding a Form1 class variable for the function generator IVI-COM object.

public class Form1 : System.Windows.Forms.Form
{
    /// <summary>
    /// Required designer variable.
    /// </summary>
    /// 
 ... 
    Agilent.Agilent33220.Interop.Agilent33220 fgen;
 .. 
}