Get the List of All Files From Server Directory in ASP.Net

Gaurav Gupta
Jun 13, 2013
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This article describes how to get the list of all files from a server folder or directory with a download link option in DataList control.

Suppose you have a folder or directory in your ASP.NET server application and you want to show all the files in that directory on the web page with a download link and allow the user to delete files from the server.

Here I will get all the fields from the server directory and display them in the DataList control with an image icon, download link and a delete option. This will work with any type of extension file.

HTML Markup for the UI

Here, I use an ASP.NET DataList control to display the files from the server directory.

<body>

<asp:FileUpload ID="FileUpload1" runat="server" />

<asp:Button ID="btnUpload" runat="server" Text="Upload" OnClick="UploadFile" />

<div style="border: solid 1px #D9DCEA; border-top: none; width: 40%; margin-top: -1px;

float: right">

<asp:DataList ID="DataListContent" runat="server" OnItemCommand="ButtonDownloadContent"

RepeatDirection="Vertical" BorderStyle="None" Style="padding: 0px!important">

<div>

<img src='<%# DataBinder.Eval(Container.DataItem,"Icon") %>' id="ImgIcon" />

<asp:LinkButton ID="ButtonDownload" runat="server" Style="padding-left: 5px; text-decoration: none"

ToolTip="Click here to download" CommandName="Download" CommandArgument='<%# DataBinder.Eval(Container.DataItem,"DownLoadLink") %>'

Text=' <%# DataBinder.Eval(Container.DataItem,"FileName") %>'></asp:LinkButton>

<asp:LinkButton ID="lnkDelete" Text="Delete" CommandArgument='<%# Eval("DownLoadLink") %>'

Style="text-decoration: none; font-size: large; color: red;" runat="server" OnClick="DeleteFile" />

</div>

</ItemTemplate>

</asp:DataList>

</div>

</form>

</body>

Getting files from directory.

Here I get all the files from the directory to show in the DataList control.

private void GenerateDownloadLinks()

{

string path = Server.MapPath("~/UploadFile");

if (Directory.Exists(path))

{

DataTable ShowContent = new DataTable();

ShowContent.Columns.Add("Icon", typeof(string));

ShowContent.Columns.Add("DownloadLink", typeof(string));

ShowContent.Columns.Add("FileName", typeof(string));

DirectoryInfo di = new DirectoryInfo(path);

foreach (FileInfo fi in di.GetFiles())

{

DataRow dr = ShowContent.NewRow();

dr["FileName"] = fi.Name; ;

dr["DownloadLink"] = Server.MapPath("~/UploadFile/") + fi.Name;

string ext = Path.GetExtension(fi.FullName);

switch (ext)

{

case "png":

dr["Icon"] = ResolveUrl("~/images/PdfIcon.png");

break;

case "doc":

dr["Icon"] = ResolveUrl("~/images/DocIcon.png");

break;

case "xls":

dr["Icon"] = ResolveUrl("~/images/ExcelIcon.png");

break;

case "txt":

dr["Icon"] = ResolveUrl("~/images/TxtIcon.png");

break;

case "zip":

dr["Icon"] = ResolveUrl("~/images/ZipIcon.png");

break;

}

DataListContent.DataSource = ShowContent;

DataListContent.DataBind();

}

Code for downloading the file:

protected void ButtonDownloadContent(object sender, DataListCommandEventArgs e)
{
        if (e.CommandName == "Download")
        {
            string path = e.CommandArgument.ToString();
            string name = Path.GetFileName(path);
            string ext = Path.GetExtension(path);
            Response.AppendHeader("content-disposition",
                "attachment; filename=" + name);
            Response.ContentType = "application/octet-stream";
            Response.WriteFile(path);
            Response.End();
        }
}

Code for deleting a file from the directory:

protected void DeleteFile(object sender, EventArgs e)
{
        string filePath = (sender as LinkButton).CommandArgument;
        File.Delete(filePath);
        GenerateDownloadLinks();
}