Programmatic DataBinding in Asp.Net

An alternative to declarative databinding, you can programmatically bind any of the List controls to a data source

Example:

Lets create a BulletList which shows the list of Fruits.

<asp:BulletedList

            ID="blFruits"

            runat="server" />

And in Page_Load() event write this code. 

protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

            List<String> fruits = new List<string>();

            fruits.Add("Apple");

            fruits.Add("Banana");

            fruits.Add("Mango");

            blFruits.DataSource = fruits;

            blFruits.DataBind();

        }

    }

if(!IsPostBack) prevents the re-initialisation of the BulletList items during postbacks.

Read About Declarative DataBinding : Declarative DataBinding in Asp.Net