ASP.NET

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public partial class UserControls_CalendarPopUp : System.Web.UI.Page<br />
{<br />
    protected void Page_Load(object sender, EventArgs e)<br />
    {<br />
        if (Request.QueryString["DefaultDate"] != "")<br />
        {<br />
            this.Cal.SelectedDate = DateTime.Parse(Request.QueryString["DefaultDate"].ToString());<br />
        }<br />
    }<br />
    protected void Cal_SelectionChanged(object sender, EventArgs e)<br />
    {<br />
        string StrTB;<br />
        string StrJs;<br />
<br />
        StrTB = Request.QueryString["TB"].ToString();<br />
        StrJs = "<script> opener.window.document.getElementById('" + StrTB + "').value = '" + this.Cal.SelectedDate.ToShortDateString() + "' ; window.close(); </script>";<br />
        this.ClientScript.RegisterClientScriptBlock(this.Page.GetType(), @"<script type=""text/javascript"">UpdateOpener();</script>", StrJs);<br />
    }<br />
}<br />
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//Code from the page that calls the popup calendar.<br />
 protected void Page_Load(object sender, EventArgs e)<br />
    {<br />
        //The following is added to the page that calls the popup calendar<br />
        if (!IsPostBack)<br />
        {<br />
            this.imgCalIcon.Style.Add("Cursor", "pointer");<br />
            this.imgCalIcon.Attributes.Add("onclick", @"popupCal('" + this.TxtDate.ClientID.ToString() + @"', '" + sDefaultDate+@"');");<br />
       }<br />
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    }<br />
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Finall the javascript on the page with the image<br />
<br />
    function popupCal(TextBox, DefaultDate)<br />
	{<br />
	settings=<br />
	"toolbar=no,location=no,directories=no,"+<br />
	"status=no,menubar=no,scrollbars=no,"+<br />
	"resizable=no,width=230,height=186;"<br />
    MyNewWindow= open("../UserControls/DateTextBox/PopUpCalendar/CalendarPopUp.aspx?TB="+TextBox+"&DefaultDate="+DefaultDate,"CalFrom",settings);<br />
	}<br />
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myListBox.DataSource = myNewlyUpdatedDataSource
myListBox.DataBind()