Hope this helps.

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            //Create a listbox, with given height/width and top/left
            var lstBox = new ListBox
            {
                Width = 300,
                Height = 300,
                Top = 10,
                Left = 10
            };

            //Add the listbox to your form
            this.Controls.Add(lstBox);

            //Create a list of your customclass
            var listCustomClass = new List<CustomClass>();

            //Populate the list with values
            for (int i = 0; i < 50; i++)
            {
                //create an instanze of your customclass
                var customClass = new CustomClass();

                //set properties of your class
                customClass.Name = "Name " + i;
                customClass.Description = "Description " + i;

                if (i % 2 == 0)
                    customClass.MethodName = "CallMeBaby";
                else
                    customClass.MethodName = "CallMeBabyWithParameter";

                customClass.RandomProperty1 = "RandomProperty1 " + i;

                //add the newly created customclass into your list
                listCustomClass.Add(customClass);
            }

            //set the listbox to display or value what you need
            lstBox.DisplayMember = "Description"; //Name of a property inside the class CustomClass
            lstBox.ValueMember = "Name"; //Name of a property inside the class CustomClass

            //set the datasource
            lstBox.DataSource = listCustomClass;

            //register the selectedindexchanged event
            lstBox.SelectedIndexChanged += lstBox_SelectedIndexChanged;
        }

        private void lstBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            //get the listbox from the sender
            var lstBox = (sender as ListBox);

            if (lstBox != null)
            {
                //safe cast the selecteditem to your customclass to get full access to any public property with the class definition
                var customClass = lstBox.SelectedItem as CustomClass;

                if (customClass != null)
                {
                    //do what ever you want with the object and its properties
                    var name = customClass.Name;
                    var desription = customClass.Description;
                    var methodName = customClass.MethodName;
                    var randomProperty1 = customClass.RandomProperty1;

                    //call a certain method based on a string within the object
                    if (methodName == "CallMeBaby")
                        CallMeBaby();
                    else if (methodName == "CallMeBabyWithParameter")
                        CallMeBaby(name);
                }
            }
        }

        //declare the methods that are being called
        private void CallMeBaby(string value)
        {
            //Access the parameter and do something
            if (value == "HelloWorld!")
            {
                //Do something...
            }
        }

        //parameterless method to show the possibilities...
        private void CallMeBaby()
        {
            //Do something...
        }


        //define a public class
        public class CustomClass
        {
            //random properties, can be extended to have what ever your need 
            public string Name { get; set; }
            public string Description { get; set; }
            public string MethodName { get; set; }
            public string RandomProperty1 { get; set; }
        }
    }