<%@ Control Language="C#" AutoEventWireup="true" CodeFile="Calendar.ascx.cs" Inherits="WebUserControl" %>
 <table>
    <tr>
    <td width="100%">
      <font><b>Select Year</b></font>
        <asp:DropDownList ID="ddlyear" runat="server"
            onselectedindexchanged="ddlyear_SelectedIndexChanged" AutoPostBack="true">

            <asp:ListItem Text="2014" Value="2014" Selected="True"></asp:ListItem>
            <asp:ListItem Text="2015" Value="2015"></asp:ListItem>
            <asp:ListItem Text="2016" Value="2016"></asp:ListItem>
            <asp:ListItem Text="2017" Value="2017"></asp:ListItem>
            <asp:ListItem Text="2018" Value="2018"></asp:ListItem>
            <asp:ListItem Text="2019" Value="2019"></asp:ListItem>
            <asp:ListItem Text="2020" Value="2020"></asp:ListItem>
            <asp:ListItem Text="2021" Value="2021"></asp:ListItem>
            <asp:ListItem Text="2022" Value="2022"></asp:ListItem>
            <asp:ListItem Text="2023" Value="2023"></asp:ListItem>
            <asp:ListItem Text="2024" Value="2024"></asp:ListItem>

    </asp:DropDownList>
</td>
</tr>
<tr>
<td>&nbsp;</td>
</tr>
<tr>
<td width="100%" dir="ltr">

    <asp:DataList ID="DataList1" runat="server" HorizontalAlign="Center"
        RepeatDirection="Horizontal" RepeatColumns="4"
        onitemdatabound="DataList1_ItemDataBound"
      >
    <HeaderTemplate>

    </HeaderTemplate>
    <ItemTemplate>
        <asp:Label ID="txt1" runat="server" Text='<%#Eval("Month") %>' Visible="false" Font-Names="Arial"></asp:Label>
        <asp:Button ID="Button1" runat="server" Text="Reset Date"/>

        <asp:HiddenField ID="hdn1" runat="server" />
        <asp:Calendar ID="Calendar_Patch" runat="server"  NextPrevFormat="CustomText"  SelectionMode="Day"    NextMonthText="" PrevMonthText=""    Font-Names="A" OtherMonthDayStyle-BorderStyle="NotSet" OtherMonthDayStyle-Wrap="False" OtherMonthDayStyle-ForeColor="#CCCCCC">
        <TitleStyle
             BackColor="#6EC347"
             ForeColor="White"
             Height="36"
             Font-Size="Large"
             Font-Names="Arial"
             />
              <SelectedDayStyle
             BackColor="Green"
             BorderColor="SpringGreen"
             />
        </asp:Calendar>
    </ItemTemplate>
    </asp:DataList>
</td>
</tr>
</table>

public partial class WebUserControl : System.Web.UI.UserControl
{
int month = 1;
public event EventHandler YearChanged;
protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        loadcalendar();
        //Session.Remove("yourDates");
        //yourDate = new DateTime();

    }

}
//public static List<DateTime> list = new List<DateTime>();

private void loadcalendar()
{

    DataTable dt = new DataTable();
    dt.Columns.Add("Month", typeof(string));
    dt.Rows.Add("January");
    dt.Rows.Add("February");
    dt.Rows.Add("March");
    dt.Rows.Add("April");
    dt.Rows.Add("May");
    dt.Rows.Add("June");
    dt.Rows.Add("July");
    dt.Rows.Add("August");
    dt.Rows.Add("September");
    dt.Rows.Add("October");
    dt.Rows.Add("Novemeber");
    dt.Rows.Add("December");

    DataList1.DataSource = dt;
    DataList1.DataBind();

}

protected void DataList1_ItemDataBound(object sender, DataListItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item ||
          e.Item.ItemType == ListItemType.AlternatingItem)
    {
        string year = ddlyear.SelectedValue.ToString();
        String str = ((Label)e.Item.FindControl("txt1")).Text;

        DateTime Now = DateTime.Now;
        DateTime TempDate = new DateTime(Convert.ToInt32(year), month, 1);

        // DateTime TempDate = new DateTime(Now.Year,Now.Month, 1);
        ((Calendar)e.Item.FindControl("Calendar_Patch")).VisibleDate = TempDate;
        month = month + 1;

    }

}

protected void ddlyear_SelectedIndexChanged(object sender, EventArgs e)
{
        loadcalendar();
        YearChanged(sender, e);

}
}