Unchecking Selected Date in Calendar - asp.net

Question

I have a asp calendar utility in ascx page. I want to unselect the selected date on second click on the same date. The following are my codes. Kindly help in this.
<%# Control Language="C#" AutoEventWireup="true"CodeFile="Calendar.ascx.cs"Inherits="WebUserControl" %>
<table>
<tr>
<td width="100%">
<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> </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:HiddenField ID="hdn1" runat="server" />
<asp:Calendar ID="Calendar1" 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>
My code behind for this ascx page is
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();
}
}
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("Calendar1")).VisibleDate = TempDate;
month = month + 1;
}
}
protected void ddlyear_SelectedIndexChanged(object sender, EventArgs e)
{
loadcalendar();
YearChanged(sender, e);
}
}
My Aspx.cs page code is like this
SqlConnection cnn = new SqlConnection();
string connStr = ConfigurationManager.ConnectionStrings["cnn"].ConnectionString;
cnn.ConnectionString = connStr;
cnn.Open();
string eid;
string ename = DropDownList2.SelectedValue.ToString();
if (ename == "1")
{
eid = "1";
}
else
{
eid = "2";
}
int cid = Int32.Parse(DropDownList1.SelectedValue.ToString());
//String sqlSelect = String.Format("Select Customer_Id from Customer where Customer_Name='{0}'", cname);
//SqlCommand cmd1 = new SqlCommand(sqlSelect, cnn);
//int cid = (int)cmd1.ExecuteScalar();
DataList dl;
dl = ((DataList)patchCalendar.FindControl("DataList1"));
foreach (DataListItem dli in dl.Items)
{
string month = Convert.ToString(((Label)dli.FindControl("txt1")).Text);
string day = Convert.ToString(((Calendar)dli.FindControl("Calendar1")).SelectedDate.Day);
string year = Convert.ToString(((Calendar)dli.FindControl("Calendar1")).SelectedDate.Year);
string date = ((Calendar)dli.FindControl("Calendar1")).SelectedDate.ToShortDateString();
if (date == "1/1/0001")
{
year = null;
date = null;
day = null;
}
else
{
SqlCommand cmd = new SqlCommand("insert into Patching_Dates values(#cid,#eid,#year,#month,#day,#date)", cnn);
cmd.Parameters.AddWithValue("#cid", cid);
cmd.Parameters.AddWithValue("#eid", eid);
cmd.Parameters.AddWithValue("#year", year);
cmd.Parameters.AddWithValue("#month", month);
cmd.Parameters.AddWithValue("#day", day);
cmd.Parameters.AddWithValue("#date", date);
cmd.ExecuteNonQuery();
}
}
cnn.Close();
string act = "Patching Dates Added";
cnn.Open();
SqlCommand cmd2 = new SqlCommand("insert into Logs values(#Username,#Activity,#Time)", cnn);
cmd2.Parameters.AddWithValue("#Username", (string)(Session["user"]));
cmd2.Parameters.AddWithValue("#Activity", act);
cmd2.Parameters.AddWithValue("#Time", System.DateTime.Now.ToString());
cmd2.ExecuteNonQuery();
cnn.Close();
}
catch (Exception ex)
{
Response.Write(ex.Message);
}

Answer 1

First check Calendar1 control having value if yes then reset it by this
Calendar1.SelectedDates.Clear();