Untitled

Imports System.IO

Public Class _Default
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim test As String = String.Empty
        If IsPostBack Then
            test = "PostBack"
        Else
            test = "not a post back event"
        End If
    End Sub

    Protected Sub btnDoSomething_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnDoSomething.Click
        Dim output As String = String.Empty
        Dim li As ListItem = DropDownList1.SelectedItem
        lblInfo.Text = li.Text
    End Sub
End Class