Make custom calendar in c#

calendar.aspx.cs

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            createcalendar(DateTime.Now.Month.ToString(), DateTime.Now.Year);
        }
    }

    public void createcalendar(string mt, int yr)
    {
        DataTable dtSource = new DataTable();
        dtSource.Columns.Add("Sunday");
        dtSource.Columns.Add("Monday");
        dtSource.Columns.Add("Tuesday");
        dtSource.Columns.Add("Wednesday");
        dtSource.Columns.Add("Thursday");
        dtSource.Columns.Add("Friday");
        dtSource.Columns.Add("Saturday");

        int year = yr;

        int month = Convert.ToInt16(mt);
        for (int y = 1; y <= 12; y++)
        {
            ddlmonth.Items.Add(new ListItem(y.ToString(), y.ToString()));
        }
        ddlmonth.SelectedValue = month.ToString();
        lblyear.Text = Convert.ToString(year);
        int DaysInMonth = DateTime.DaysInMonth(year, month);

        int i = 1;


        for (int weak = 0; weak <= 5; weak++)
        {
            DataRow newday = dtSource.NewRow();
            for (int day = 1; day <= 7; day++)
            {
                if (i > DaysInMonth) break;
                DateTime dDate = DateTime.ParseExact(i.ToString() + "/" + month.ToString() + "/" + year.ToString(), "d/M/yyyy", null);
                DayOfWeek dayWeek = CultureInfo.InvariantCulture.Calendar.GetDayOfWeek(dDate);
                newday[dayWeek.ToString()] = i.ToString();
                i++;

                if (dayWeek.ToString() == "Saturday") break;
            }
            dtSource.Rows.Add(newday);
            if (i > DaysInMonth) break;
        }

        WeekRepeater.DataSource = dtSource;
        WeekRepeater.DataBind();

        hdnyear.Value = year.ToString();


    }
    protected void lnkprev_Click(object sender, EventArgs e)
    {
        createcalendar(ddlmonth.SelectedValue, Convert.ToInt16(hdnyear.Value) - 1);
    }
    protected void lnknext_Click(object sender, EventArgs e)
    {
        createcalendar(ddlmonth.SelectedValue, Convert.ToInt16(hdnyear.Value) + 1);
    }
    protected void ddlmonth_SelectedIndexChanged(object sender, EventArgs e)
    {
        createcalendar(ddlmonth.SelectedValue, Convert.ToInt16(hdnyear.Value));
    }
    protected void btnshow_Click(object sender, EventArgs e)
    {
        createcalendar(ddlmonth.SelectedValue, Convert.ToInt16(hdnyear.Value));
    }

calendar.aspx

<div id="calbg">
    <div id="calcontent">
        <table>
            <tr>
                <td>
                    <asp:TextBox runat="server" ID="txtdatefrom"></asp:TextBox>
                </td>
                <td>
                    <asp:TextBox runat="server" ID="txtdateto"></asp:TextBox>
                </td>
                <td>
                    <asp:Button runat="server" ID="btnshow" Text="SHOW" OnClick="btnshow_Click" />
                </td>
            </tr>
        </table>
        <table>
            <tr>
                <td>
                    <asp:LinkButton runat="server" ID="lnkprev" Text="<" OnClick="lnkprev_Click"></asp:LinkButton>
                </td>
                <td colspan="5">
                    <asp:DropDownList runat="server" ID="ddlmonth" OnSelectedIndexChanged="ddlmonth_SelectedIndexChanged" AutoPostBack="true"></asp:DropDownList>
                    <asp:Label runat="server" ID="lblyear"></asp:Label>
                </td>
                <td>
                    <asp:LinkButton runat="server" ID="lnknext" Text=">" OnClick="lnknext_Click"></asp:LinkButton>
                </td>
            </tr>
        </table>
        <asp:Repeater ID="WeekRepeater" runat="server" OnItemDataBound="WeekRepeater_ItemDataBound">
            <HeaderTemplate>
                <table>

                    <tr>
                        <th>Su
                        </th>
                        <th>Mo
                        </th>
                        <th>Tu
                        </th>
                        <th>Wed
                        </th>
                        <th>Thu
                        </th>
                        <th>Fr
                        </th>
                        <th>Sa
                        </th>
                    </tr>
            </HeaderTemplate>
            <ItemTemplate>
                <tr>
                    <td bgcolor="#CCFFCC">
                        <asp:Label runat="server" ID="Label1" Text='<%# Eval("Sunday") %>' />
                    </td>
                    <td bgcolor="#CCFFCC">
                        <asp:Label runat="server" ID="Label2" Text='<%# Eval("Monday") %>' />
                    </td>
                    <td bgcolor="#CCFFCC">
                        <asp:Label runat="server" ID="Label3" Text='<%# Eval("Tuesday") %>' />
                    </td>
                    <td bgcolor="#CCFFCC">
                        <asp:Label runat="server" ID="Label4" Text='<%# Eval("Wednesday") %>' />
                    </td>
                    <td bgcolor="#CCFFCC">
                        <asp:Label runat="server" ID="Label5" Text='<%# Eval("Thursday") %>' />
                    </td>
                    <td bgcolor="#CCFFCC">
                        <asp:Label runat="server" ID="Label6" Text='<%# Eval("Friday") %>' />
                    </td>
                    <td bgcolor="#CCFFCC">
                        <asp:Label runat="server" ID="Label7" Text='<%# Eval("Saturday") %>' />
                    </td>
                </tr>
            </ItemTemplate>
        </asp:Repeater>
        <asp:HiddenField runat="server" ID="hdnyear" />
    </div>
</div>

Adding Code to the Event Handler (PART-14)

Adding code to the event handler is, well, exactly as you would expect it to be. Place the cursor in the space between Protected Sub Button1_Click(…) and End Sub and type the appropriate code in. For

now, all the code will do is change the text of the label (Label1) to, you guessed it, "Hello world!". Type in the following code, and pause after you type the period: