How to fill dropdownlist with days, month and year in asp.net(C#, VB)

Introduction: In previous articles i explained How to fill DropDownList from Sql server database in asp.net and how to Fill CheckBoxList based on DropDownList selection in asp.net(C#, VB) and How to open Pop up window on Drop down selection in Asp.net. Now in this article I am going to explain one of the common requirements while creating user input form like registration form where user has to select his date of birth, joining date etc.

Description: So here in this example I have demonstrated with example How to fill/ load/ bind years, months and days in the DropDownList . Current date will be selected in the DropDownList by default and when user select another month from the DropDownList then corresponding number of days will be filled in the days DropDownList.

Implementation: Let's create an asp.net application to understand.

• In the design page(.aspx) place 3 DropDownList for year, month and days as:

 <fieldset style="width:300px">

    <legend>Select Date</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>

• In the Code behind file(.aspx.cs) write the code as:

C#.NET Code to fill dropdownlist with days, months and years in asp.net

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!Page.IsPostBack)

        {

            //Fill Years

            for (int i = 2013; i <= 2020; i++)

            {

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

            }

            ddlYear.Items.FindByValue(System.DateTime.Now.Year.ToString()).Selected = true;  //set current year as selected

            //Fill Months

            for (int i = 1; i <= 12; i++)

            {

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

            }

            ddlMonth.Items.FindByValue(System.DateTime.Now.Month.ToString()).Selected = true; // Set current month as selected

            //Fill days

            FillDays();

        }

    }

    public void FillDays()

    {

        ddlDay.Items.Clear();

        //getting numbner of days in selected month & year

        int noofdays = DateTime.DaysInMonth(Convert.ToInt32(ddlYear.SelectedValue), Convert.ToInt32(ddlMonth.SelectedValue));

        //Fill days

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

        {

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

        }

        ddlDay.Items.FindByValue(System.DateTime.Now.Day.ToString()).Selected = true;// Set current date as selected

    }

    protected void ddlYear_SelectedIndexChanged(object sender, EventArgs e)

    {

        FillDays();

    }

    protected void ddlMonth_SelectedIndexChanged(object sender, EventArgs e)

{
 FillDays();
}

• In the Code behind file(.aspx.vb) write the code as:

VB.NET Code to fill dropdownlist with days, months and years in asp.net

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

        If Not Page.IsPostBack Then

            'Fill Years

            For i As Integer = 2013 To 2020

                ddlYear.Items.Add(i.ToString())

            Next

            ddlYear.Items.FindByValue(System.DateTime.Now.Year.ToString()).Selected = True  'set current year as selected

            'Fill Months

            For i As Integer = 1 To 12

                ddlMonth.Items.Add(i.ToString())

            Next

            ddlMonth.Items.FindByValue(System.DateTime.Now.Month.ToString()).Selected = True  ' Set current month as selected

            'Fill days

            FillDays()

        End If

    End Sub

    Public Sub FillDays()

        ddlDay.Items.Clear()

        'getting numbner of days in selected month & year

        Dim noofdays As Integer = DateTime.DaysInMonth(Convert.ToInt32(ddlYear.SelectedValue), Convert.ToInt32(ddlMonth.SelectedValue))

        'Fill days

        For i As Integer = 1 To noofdays

            ddlDay.Items.Add(i.ToString())

        Next

        ddlDay.Items.FindByValue(System.DateTime.Now.Day.ToString()).Selected = True ' Set current date as selected

    End Sub

    Protected Sub ddlYear_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)

        FillDays()

    End Sub

    Protected Sub ddlMonth_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)

        FillDays()

    End Sub

Now over to you:

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