How to fill dropdownlist with days, month and year in asp.net

How to fill dropdownlist with days, month and year 

Introduction: In previous article 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. So here in this example I have demonstrated how to fill year, month and day in theDropDownList . 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.

• 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

    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();
}