Hi dorsa,

Refer the below code.

HTML

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" EmptyDataText="No files uploaded">
    <Columns>
        <asp:BoundField DataField="Text" HeaderText="File Name" />
        <asp:BoundField DataField="Value" HeaderText="Path" />
    </Columns>
</asp:GridView>

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        string[] filePaths = System.IO.Directory.GetFiles(Server.MapPath("~/Uploads/"));
        List<ListItem> files = new List<ListItem>();
        foreach (string filePath in filePaths)
        {
            files.Add(new ListItem(System.IO.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

For more details refer below article.

Upload and Download files from Folder (Directory) in ASP.Net using C# and VB.Net