ArgumentOutOFRangeException was unhandled by user code Error

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C#

Hi,

I have downloaded the C# code for ctlCalendar control. I have deployed the coding on visual studio 2005 C#. When I run the solution is giving me an error on line 36. The error message is ArgumentOutOf RangeException was unhandled by user code.

Please assist the code behind of the page is below

namespace purchaseorders
{
	using System;
	using System.Data;
	using System.Drawing;
	using System.Web;
	using System.Web.UI.WebControls;
	using System.Web.UI.HtmlControls;
   

	/// <summary>
	///		Summary description for ctlCalendar.
	/// </summary>
	public partial class ctlCalendar : System.Web.UI.UserControl
	{

		protected void Page_Load(object sender, System.EventArgs e)
		{
			if (!Page.IsPostBack)
			{
				this.TextBox1.Text = System.DateTime.Now.ToShortDateString();
				this.pnlCalendar.Attributes.Add("style","DISPLAY: none; POSITION: absolute");
			}
			else
			{
              
                string id = Page.Request.Form["__EVENTTARGET"].Substring(0, Page.Request.Form["__EVENTTARGET"].IndexOf(":"));
				if (id != this.ID) 
				{
					this.pnlCalendar.Attributes.Add("style","DISPLAY: none; POSITION: absolute");
				}
				else
				{
					this.pnlCalendar.Attributes.Add("style","POSITION: absolute");
				}

			}
			Page.RegisterClientScriptBlock("Script_Panel" + this.ID, "<script> function On"+this.ID+"Click() {  if("+this.ID+"_pnlCalendar.style.display == \"none\")     "+this.ID+"_pnlCalendar.style.display = \"\";   else    "+this.ID+"_pnlCalendar.style.display = \"none\"; } </script>");			
			this.Button1.Attributes.Add("OnClick","On"+this.ID+"Click()");
			
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		///		Required method for Designer support - do not modify
		///		the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{

		}
		#endregion

		protected void Calendar1_SelectionChanged(object sender, System.EventArgs e)
		{
			this.TextBox1.Text = Calendar1.SelectedDate.ToShortDateString();
			this.pnlCalendar.Attributes.Add("style","DISPLAY: none; POSITION: absolute");
		}

	}
}

HTML code is below

<%@ Control Language="c#" Inherits="purchaseorders.ctlCalendar" CodeFile="ctlCalendar.ascx.cs" %>
<asp:textbox id="TextBox1" runat="server" ReadOnly="True" CssClass="text"></asp:textbox>
<input type="button" id="Button1" runat="server" value="..." class="text"><br>
<asp:Panel id="pnlCalendar" runat="server">
	<asp:calendar id="Calendar1" runat="server" BackColor="White" Width="200px" DayNameFormat="FirstLetter"
		ForeColor="Black" Height="180px" Font-Size="8pt" Font-Names="Verdana" BorderColor="#999999"
		CellPadding="4" onselectionchanged="Calendar1_SelectionChanged">
		<TodayDayStyle ForeColor="Black" BackColor="#CCCCCC"></TodayDayStyle>
		<SelectorStyle BackColor="#CCCCCC"></SelectorStyle>
		<NextPrevStyle VerticalAlign="Bottom"></NextPrevStyle>
		<DayHeaderStyle Font-Size="7pt" Font-Bold="True" BackColor="#CCCCCC"></DayHeaderStyle>
		<SelectedDayStyle Font-Bold="True" ForeColor="White" BackColor="#666666"></SelectedDayStyle>
		<TitleStyle Font-Bold="True" BorderColor="Black" BackColor="#999999"></TitleStyle>
		<WeekendDayStyle BackColor="LightSteelBlue"></WeekendDayStyle>
		<OtherMonthDayStyle ForeColor="#808080"></OtherMonthDayStyle>
	</asp:calendar>
</asp:Panel><BR>
<script>

</script>

The error message is pointing to the line below on code behind

string id = Page.Request.Form["__EVENTTARGET"].Substring(0, Page.Request.Form["__EVENTTARGET"].IndexOf(":"));

Kind Regards
Takalani