ASP.NET DropDownList Years
The following asp.net c# example code demonstrate us how can we display a list of years in
a DropDownList server control. Many web developers want to avoid TextBox to collect a year from
web users. To select a year from DropDownList is very easy and error free way. Web visitors can select a year
from a drop down list without writing content on TextBox control.
In the bellow example code, we populated a DropDownList with 11 years. We populated the DropDownList with previous 5 years and future 5 years and current year based on the current year. At first we create a variable to hold the current year from system DateTime object. Then we subtract 5 years and Add 5 years with the present year integer value to loop through it. Finally, DropDownList render items with 11 years.
In the bellow example code, we populated a DropDownList with 11 years. We populated the DropDownList with previous 5 years and future 5 years and current year based on the current year. At first we create a variable to hold the current year from system DateTime object. Then we subtract 5 years and Add 5 years with the present year integer value to loop through it. Finally, DropDownList render items with 11 years.
dropdownlist-years.aspx
<%@ Page Language="C#" AutoEventWireup="true"%>
<!DOCTYPE html>
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
if(!Page.IsPostBack)
{
int year = DateTime.Now.Year;
for (int i = year - 5; i <= year + 5; i++)
{
ListItem li = new ListItem(i.ToString());
DropDownList1.Items.Add(li);
}
DropDownList1.Items.FindByText(year.ToString()).Selected = true;
}
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
Label1.Text = "you selected....<br />";
Label1.Text += DropDownList1.SelectedItem.Text;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>asp.net dropdownlist years</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h2 style="color:MidnightBlue; font-style:italic;">
asp.net example - dropdownlist years
</h2>
<hr width="550" align="left" color="Gainsboro" />
<asp:Label
ID="Label1"
runat="server"
Text="select an item from dropdownlist."
Font-Size="X-Large"
Width="350"
>
</asp:Label>
<br /><br />
<asp:DropDownList
ID="DropDownList1"
runat="server"
AutoPostBack="true"
Width="350"
Font-Size="X-Large"
OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged"
>
</asp:DropDownList>
</div>
</form>
</body>
</html>

- Sort DropDownList items in descending order
- Select DropDownList item by value
- Select DropDownList item by item text
- Display different tooltip on ListBox items
- Apply ListBox auto height
- Remove selected items from ListBox
- Add attributes to a ListBox items
- ScrollBar in a CheckBoxList
- Maximum limit of selection in a CheckBoxList
- Default selected item in RadioButtonList