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ASP.NET FileUpload - How to upload file with specific extension

asp.net FileUpload example: how to upload file with specific extension
FileUpload.aspx
<%@ Page Language="C#" %>
<%@ Import Namespace="System.IO" %>

<!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 Button1_Click(object sender, System.EventArgs e) { 
        string uploadFolder = Request.PhysicalApplicationPath+"UploadFolder\\" ;
        if (FileUpload1.HasFile)
        {
            string extension = Path.GetExtension(FileUpload1.PostedFile.FileName);
            if (extension.ToLower() == ".jpg")
            {

                FileUpload1.SaveAs(uploadFolder + FileUpload1.FileName);
                Label1.Text = "File uploaded successfully: " + FileUpload1.PostedFile.FileName;
                string imageSrc = "~/UploadFolder/" + FileUpload1.PostedFile.FileName;
                Image1.ImageUrl = imageSrc;
                Image1.BorderWidth = 2;
                Image1.BorderColor = System.Drawing.Color.SeaGreen;

            }
            else
            {
                Label1.Text = "This file extension not permitted: " + extension;
            }
        }
        else
        {
            Label1.Text = "Please select a file.";
        }
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>asp.net FileUpload example: how to upload file with specific extension</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Red">asp.net FileUpload example: specific file extension</h2>
        <asp:Label 
             ID="Label1" 
             runat="server" 
             Font-Size="Large"
             ForeColor="SeaGreen"
             >
        </asp:Label>
        <br /><br />
        <asp:Label 
             ID="Label2" 
             runat="server" 
             ForeColor="DodgerBlue"
             Text="Choose a file for upload."
             Font-Bold="true"
             >
        </asp:Label>
        <br />
        <asp:FileUpload 
             ID="FileUpload1" 
             runat="server" 
             BackColor="DodgerBlue" 
             ForeColor="AliceBlue" 
             />
        <asp:Button 
             ID="Button1" 
             runat="server" 
             Font-Bold="true" 
             ForeColor="DodgerBlue" 
             OnClick="Button1_Click"
             Text="Upload Now"
             />   
        <br /><br />
        <asp:Image ID="Image1" runat="server" />                       
        
    </div>
    </form>
</body>
</html>












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