Preview uploaded files before upload with ASP.Net FileUpload control using C# and VB.Net

Hi anirudhp,

Refer below sample code.

HTML

<asp:FileUpload ID="fuMultiple" runat="server" multiple="multiple" />
<br />
<asp:Button Text="Upload" runat="server" OnClick="Upload" />
<asp:Button Text="Save" runat="server" OnClick="Save" />
<br />
<asp:ListView runat="server" ID="lstview1">
    <ItemTemplate>
        <table border="1" cellpadding="0" cellspacing="0">
            <tr>
                <td>
                    <asp:Label ID="Label1" Text='<%#Eval("Text") %>' runat="server" />
                </td>
            </tr>
        </table>
    </ItemTemplate>
</asp:ListView>

Namespaces

C#

using System.IO;

VB.Net

Imports System.IO

Code

C#

protected void Upload(object sender, EventArgs e)
{
    List<HttpPostedFile> files = new List<HttpPostedFile>();
    for (int i = 0; i < Request.Files.Count; i++)
    {
        files.Add(Request.Files[i]);
    }
    lstview1.DataSource = (from f in files
                            select new
                            {
                                Text = f.FileName
                            }).ToList();
    lstview1.DataBind();
    Session["Files"] = files;
}

protected void Save(object sender, EventArgs e)
{
    List<HttpPostedFile> files = Session["Files"] as List<HttpPostedFile>;
    for (int i = 0; i < files.Count; i++)
    {
        files[i].SaveAs(Server.MapPath("~/uploads/") + files[i].FileName);
    }
}

VB.Net

Protected Sub Upload(ByVal sender As Object, ByVal e As EventArgs)
    Dim files As List(Of HttpPostedFile) = New List(Of HttpPostedFile)()

    For i As Integer = 0 To Request.Files.Count - 1
        files.Add(Request.Files(i))
    Next

    lstview1.DataSource = (From f In files Select New With {Key .Text = f.FileName}).ToList()
    lstview1.DataBind()
    Session("Files") = files
End Sub

Protected Sub Save(ByVal sender As Object, ByVal e As EventArgs)
    Dim files As List(Of HttpPostedFile) = TryCast(Session("Files"), List(Of HttpPostedFile))

    For i As Integer = 0 To files.Count - 1
        files(i).SaveAs(Server.MapPath("~/uploads/") + files(i).FileName)
    Next
End Sub