Fill dropdownlist with days, month and year in asp.net

Introduction: In this article today I will explain how we can fill dropdownlist with days, month and year in asp.net

Description:

In the previous article I have explained Server side validation in MVC Razor using data annotation,Like linq query example and bind gridview,Create a dynamic Slider in asp.net, URL routing in asp.net website, Populate Dropdown List dynamically using Asp.net MVC Razor, Code First migration in asp.net MVC 4, Populate Cascading Dropdown List in Asp.net MVC4 using Json and Jquery and What is Asp.net MVC? Its advantages and disadvantges.

Add a webform to application and design the .aspx page as mention below:

  <fieldset style="width:400px">

    <legend>Fill Dropdownlist with Year,Month and Date Example</legend>

    Year: <asp:DropDownList ID="ddlyear" runat="server" AutoPostBack="True"

            onselectedindexchanged="ddlyear_SelectedIndexChanged" ></asp:DropDownList>

          

    Month: <asp:DropDownList ID="ddlmonth" runat="server" AutoPostBack="True"

            onselectedindexchanged="ddlmonth_SelectedIndexChanged">

        </asp:DropDownList>

      

    Day: <asp:DropDownList ID="ddlday" runat="server">

        </asp:DropDownList>

    </fieldset>

Now write the code on .aspx.cs file:

using System.Globalization;

protected void Page_Load(object sender, EventArgs e)

        {

            if (!Page.IsPostBack)

            {

                for (int i = 1980; i <= 2015; i++)

                {

                    ddlyear.Items.Add(i.ToString());

                }

                ddlyear.Items.FindByValue(System.DateTime.Now.Year.ToString()).Selected = true;

                Fillmonth();

                FillDays();

            }

        }

        private void FillDays()

        {

            ddlday.Items.Clear();

            int noofdays = DateTime.DaysInMonth(Convert.ToInt32(ddlyear.SelectedValue), Convert.ToInt32(ddlmonth.SelectedValue));

            for (int i = 1; i <= noofdays; i++)

            {

                ddlday.Items.Add(i.ToString());

            }

            ddlday.Items.FindByValue(System.DateTime.Now.Day.ToString()).Selected = true;

        }

        private void Fillmonth()

        {

            DateTimeFormatInfo info = DateTimeFormatInfo.GetInstance(null);

            for (int i = 1; i < 13; i++)

            {

                ddlmonth.Items.Add(new ListItem(info.GetMonthName(i), i.ToString()));

            }

            ddlmonth.Items.FindByValue(System.DateTime.Now.Month.ToString()).Selected = true;

        }

        protected void ddlyear_SelectedIndexChanged(object sender, EventArgs e)

        {

            FillDays();

        }

        protected void ddlmonth_SelectedIndexChanged(object sender, EventArgs e)

        {

            FillDays();

        }

In VB:

Imports System.Globalization

Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load

        If Not Page.IsPostBack Then

            For i As Integer = 1980 To 2015

                ddlyear.Items.Add(i.ToString())

            Next

            ddlyear.Items.FindByValue(System.DateTime.Now.Year.ToString()).Selected = True

            Fillmonth()

            FillDays()

        End If

    End Sub

    Private Sub FillDays()

        ddlday.Items.Clear()

        Dim noofdays As Integer = DateTime.DaysInMonth(Convert.ToInt32(ddlyear.SelectedValue), Convert.ToInt32(ddlmonth.SelectedValue))

        For i As Integer = 1 To noofdays

            ddlday.Items.Add(i.ToString())

        Next

        ddlday.Items.FindByValue(System.DateTime.Now.Day.ToString()).Selected = True

    End Sub

    Private Sub Fillmonth()

        Dim info As DateTimeFormatInfo = DateTimeFormatInfo.GetInstance(Nothing)

        For i As Integer = 1 To 12

            ddlmonth.Items.Add(New ListItem(info.GetMonthName(i), i.ToString()))

        Next

        ddlmonth.Items.FindByValue(System.DateTime.Now.Month.ToString()).Selected = True

    End Sub

    Protected Sub ddlyear_SelectedIndexChanged(sender As Object, e As EventArgs)

        FillDays()

    End Sub

    Protected Sub ddlmonth_SelectedIndexChanged(sender As Object, e As EventArgs)

        FillDays()

    End Sub

Run the project and check the result.

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