asp.net calender control problem

Question

iam using calender control in asp.net 2.0 as it is using master pages.. iam opening a window form content pages.. on window.close it is giving me null object as its not getting form name you help will be appreciated

code on content page:

<a onclick="openwindow();" ahref="#">
<img src="Images/calendar.gif" style="width: 20px; height: 20px" border=0/></a>
<input ID="Text1" runat="server" readonly="readOnly" type="text" />

function openwindow() {  
    window.open('/Calender.aspx', 'calendar_window','width=154,height=188');
}

code on opened window from content page

protected void Calender1_SelectionChanged(object sender, EventArgs e)
    {
        string strjscript = "<script language='javascript'>";
        strjscript += "window.opener." + HttpContext.Current.Request.QueryString["formname"];
        strjscript += ".value = '" + Calender1.SelectedDate.ToString("yyyy-MM-dd") + "'; window.close();";
        strjscript += "</script" + ">";  
        Literal1.Text = strjscript; 
    }

    protected void Calendar1_dayrender(object sender, DayRenderEventArgs e)
    {             
          if(e.Day.Date==DateTime.Now)
        {
            e.Cell.BackColor = System.Drawing.Color.LightGray;
        }

    }

Answer 1

Looks like you are not following this tutorial but not exactly what it is doing.

Points to note:

1: Make sure you are naming your form

2: Pass textbox reference via querystring i.e. Calender.aspx?formname=frmCalendar.txtDate

3: Path to your calender.aspx is correct.

You are close to solution but may be you need to share your main page code as well for us.

Edit 1 Ok I see now what you are saying. Add this script block to your content page:

<script type="text/javascript">
    function openwindow() {
        var txtid = '<%=txtDate.ClientID %>';
        var frmid = '<%=Page.Form.ClientID %>';
        var qs = "formname=" + frmid + "." + txtid;
            window.open('/Calendar.aspx?' + qs,'calendar_window', 'width=154,height=188');
        }
</script>

Although if possible try using jquery datepicker and you can post your code and issue if you want to go that route.