In this article I will explain how we can save and retrieve files from Windows Folder and Directory and display them in ASP.Net GridView control with download and delete option.
 
HTML Markup
Below is the HTML Markup of the page, where I have an ASP.Net control FileUpload to upload files, a Buttoncontrol to trigger file uploads and an ASP.Net GridViewcontrol to display the files from folder.
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="btnUpload" runat="server" Text="Upload" OnClick="UploadFile" />
<hr />
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" EmptyDataText = "No files uploaded">
    <Columns>
        <asp:BoundField DataField="Text" HeaderText="File Name" />
        <asp:TemplateField>
            <ItemTemplate>
                <asp:LinkButton ID="lnkDownload" Text = "Download" CommandArgument = '<%# Eval("Value") %>' runat="server" OnClick = "DownloadFile"></asp:LinkButton>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:LinkButton ID = "lnkDelete" Text = "Delete" CommandArgument = '<%# Eval("Value") %>' runat = "server" OnClick = "DeleteFile" />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>
 
 
Namespaces
You will need to import the following namespaces.
C#
using System.IO;
 
VB.Net
Imports System.IO
 
 
 
Uploading the File and saving in directory or folder
When the file is selected in APS.Net FileUpload control and the Upload button is clicked the following event handler is triggered. Below I have folder Uploads in the root directory of my ASP.Net Website where I am saving the uploaded file.
C#
protected void UploadFile(object sender, EventArgs e)
{
    string fileName = Path.GetFileName(FileUpload1.PostedFile.FileName);
    FileUpload1.PostedFile.SaveAs(Server.MapPath("~/Uploads/") + fileName);
    Response.Redirect(Request.Url.AbsoluteUri);
}
 
VB.Net
Protected Sub UploadFile(ByVal sender As Object, ByVal e As EventArgs)
    Dim fileName As String = Path.GetFileName(FileUpload1.PostedFile.FileName)
    FileUpload1.PostedFile.SaveAs((Server.MapPath("~/Uploads/") + fileName))
    Response.Redirect(Request.Url.AbsoluteUri)
End Sub
 
 
Displaying the files from folder or directory in ASP.Net GridView
Here I am reading all the files from the Uploads directory which I have created and then binding the fetched files to the ASP.Net GridView control.
C#
protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        string[] filePaths = Directory.GetFiles(Server.MapPath("~/Uploads/"));
        List<ListItem> files = new List<ListItem>();
        foreach (string filePath in filePaths)
        {
            files.Add(new ListItem(Path.GetFileName(filePath), filePath));
        }
        GridView1.DataSource = files;
        GridView1.DataBind();
    }
}
 
VB.Net
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not IsPostBack Then
        Dim filePaths() As String = Directory.GetFiles(Server.MapPath("~/Uploads/"))
        Dim files As List(Of ListItem) = New List(Of ListItem)
        For Each filePath As String In filePaths
            files.Add(New ListItem(Path.GetFileName(filePath), filePath))
        Next
        GridView1.DataSource = files
        GridView1.DataBind()
    End If
End Sub
 
 
 
Downloading the Uploaded File from ASP.Net GridView
The following event handler is executed when the lnkDownload LinkButton is clicked in the ASP.Net GridView Row. Using the CommandArgument property of the ASP.Net LinkButton, I get the path of the file using which I am downloading the file.
C#
protected void DownloadFile(object sender, EventArgs e)
{
    string filePath = (sender as LinkButton).CommandArgument;
    Response.ContentType = ContentType;
    Response.AppendHeader("Content-Disposition", "attachment; filename=" + Path.GetFileName(filePath));
    Response.WriteFile(filePath);
    Response.End();
}
 
VB.Net
Protected Sub DownloadFile(ByVal sender As Object, ByVal e As EventArgs)
    Dim filePath As String = CType(sender, LinkButton).CommandArgument
    Response.ContentType = ContentType
    Response.AppendHeader("Content-Disposition", ("attachment; filename=" + Path.GetFileName(filePath)))
    Response.WriteFile(filePath)
    Response.End()
End Sub
 
 
 
Deleting the Uploaded File from ASP.Net GridView
The following event handler is executed when the lnkDelete LinkButton is clicked in the ASP.Net GridView Row. Using the CommandArgument property of the ASP.Net LinkButton, I get the path of the file using which I am deleting the file.
C#
protected void DeleteFile(object sender, EventArgs e)
{
    string filePath = (sender as LinkButton).CommandArgument;
    File.Delete(filePath);
    Response.Redirect(Request.Url.AbsoluteUri);
}
 
VB.Net
Protected Sub DeleteFile(ByVal sender As Object, ByVal e As EventArgs)
    Dim filePath As String = CType(sender, LinkButton).CommandArgument
    File.Delete(filePath)
    Response.Redirect(Request.Url.AbsoluteUri)
End Sub
 
 
Demo
 
Downloads