here the code below(.aspx)
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
Image1.ImageUrl = @"~/p1/"+DropDownList1.SelectedItem.ToString()+".jpg";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div style="height: 402px">
<br />
<asp:DropDownList ID="DropDownList1" runat="server">
<asp:ListItem>i1</asp:ListItem>
<asp:ListItem>i2</asp:ListItem>
<asp:ListItem>i3</asp:ListItem>
<asp:ListItem>i4</asp:ListItem>
</asp:DropDownList>
<asp:Image ID="Image1" runat="server" Height="172px" Width="233px" />
<br />
<br />
<asp:Button ID="Button1" runat="server" Text="SHOW" onclick="Button1_Click" />
</div>
</form>
</body>
</html>
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