ASP.NET

<script type="text/javascript"> 
   function ClientSidePrint(idDiv) 
    { 
          var w = 600;
          var h = 400;
          var l = (window.screen.availWidth - w)/2;
          var t = (window.screen.availHeight - h)/2;
            
          var sOption="toolbar=no,location=no,directories=no,menubar=no,scrollbars=yes,width=" + w + ",height=" + h + ",left=" + l + ",top=" + t;
 
       // Get the HTML content of the div
       var sDivText = window.document.getElementById(idDiv).innerHTML;

      // Open a new window
      var objWindow = window.open("", "Print", sOption);

    // Write the div element to the window
    objWindow.document.write(sDivText);
    objWindow.document.close(); 
 
    // Print the window                  
    objWindow.print();
   
    // Close the window
    objWindow.close();                  
   } 
</script>

<br />
protected void Page_Load(object sender, EventArgs e)<br />
{<br />
if(!Page.IsPostBack)<br />
{<br />
query = "select CustId,FirstName+' '+LastName as Name from custdetails where BrokerId='" + Session["broker"] + "'";<br />
dt = obj.select(query);<br />
ListBox1.DataSource = dt;<br />
ListBox1.DataTextField = "Name";<br />
ListBox1.DataValueField = "CustId";<br />
ListBox1.DataBind(); //<-- replace this with ListBox1<br />
}<br />
}<br />
<br />
protected void Button1_Click(object sender, EventArgs e)<br />
{<br />
Label2.Text = ListBox1.SelectedValue;<br />
}<br />
<br />