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:


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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