This Artical i will explain how to use dropdownlist in ASP.NET .
Example
<%@ Page Language="C#" %>
<script runat="server">
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
Response.Write("You selected item number " +
DropDownList1.SelectedValue + "<br>");
Response.Write("You didn't select item number " +
DropDownList1.Items[1].Value);
}
</script>
<html>
<head id="Head1" runat="server">
<title>DropDownList Server Control</title>
</head>
<body>
<form id="form1" runat="server">
<asp:DropDownList ID="DropDownList1" Runat="server" AutoPostBack="True"
OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
<asp:ListItem Value="1">First Choice</asp:ListItem>
<asp:ListItem Value="2" Enabled="False">Second Choice</asp:ListItem>
<asp:ListItem Value="3">Third Choice</asp:ListItem>
</asp:DropDownList>
</form>
</body>
</html>
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