Upload file using AsyncFileUpload and bind in ASP.Net GridView using C# and VB.Net

Hi rakeshkuma,

AsyncFileUpload uploads files asnychronously, so the event at code behind is not triggered as that were in a normal postback.

You need to use OnClientUploadComplete event to bind the GridView.

Refer below sample.

HTML

<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel runat="server">
    <ContentTemplate>
        <ajax:AsyncFileUpload ID="AsyncFileUpload1" CssClass="form-control" CompleteBackColor="White"
            Width="100%" runat="server" UploaderStyle="Modern" UploadingBackColor="White" ThrobberID="imgLoad"
            OnUploadedComplete="AsyncFileUpload1_UploadedComplete" OnClientUploadComplete="uploadComplete" />
        <asp:Image ID="imgLoad" runat="server" ImageUrl="~/images/loader.gif" />
        <asp:Label ID="Label38" runat="server" Font-Size="12px" ForeColor="Green"></asp:Label>
        <asp:Label ID="Label39" runat="server" Font-Size="12px" ForeColor="Red"></asp:Label>
        <asp:GridView runat="server" ID="gvFiles" 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>
        <asp:Button ID="btnRefresh" Text="" Style="display: none;" runat="server" OnClick="OnRefresh" />
    </ContentTemplate>
</asp:UpdatePanel>
<script type="text/javascript">
    function uploadComplete(sender) {
        document.getElementById('btnRefresh').click();
    }
</script>

Namespaces

C#

using System.Collections.Generic;
using System.IO;
using AjaxControlToolkit;

VB.Net

Imports System.Collections.Generic
Imports System.IO
Imports AjaxControlToolkit

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        BindGridView();
    }
}

protected void AsyncFileUpload1_UploadedComplete(object sender, AsyncFileUploadEventArgs e)
{
    string extension = Path.GetExtension(e.FileName);
    if (extension.ToLower() == ".pdf")
    {
        AsyncFileUpload1.SaveAs(Server.MapPath("documents/") + Path.GetFileName(e.FileName));
    }

    ClearContents(sender as Control);
}

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();
}

protected void DeleteFile(object sender, EventArgs e)
{
    string filePath = (sender as LinkButton).CommandArgument;
    File.Delete(filePath);
    Response.Redirect(Request.Url.AbsoluteUri);
}

protected void OnRefresh(object sender, EventArgs e)
{
    BindGridView();
}

private void BindGridView()
{
    string[] filePaths = Directory.GetFiles(Server.MapPath("~/documents/"));
    List<ListItem> files = new List<ListItem>();
    foreach (string filePath in filePaths)
    {
        files.Add(new ListItem(Path.GetFileName(filePath), filePath));
    }
    gvFiles.DataSource = files;
    gvFiles.DataBind();
}

private void ClearContents(Control control)
{
    for (var i = 0; i < Session.Keys.Count; i++)
    {
        if (Session.Keys[i].Contains(control.ClientID))
        {
            Session.Remove(Session.Keys[i]);
            break;
        }
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not IsPostBack Then
        BindGridView()
    End If
End Sub

Protected Sub AsyncFileUpload1_UploadedComplete(ByVal sender As Object, ByVal e As AsyncFileUploadEventArgs)
    Dim extension As String = Path.GetExtension(e.FileName)
    If extension.ToLower() = ".pdf" Then
        AsyncFileUpload1.SaveAs(Server.MapPath("documents/") + Path.GetFileName(e.FileName))
    End If

    ClearContents(TryCast(sender, Control))
End Sub

Protected Sub DownloadFile(ByVal sender As Object, ByVal e As EventArgs)
    Dim filePath As String = TryCast(sender, LinkButton).CommandArgument
    Response.ContentType = ContentType
    Response.AppendHeader("Content-Disposition", "attachment; filename=" & Path.GetFileName(filePath))
    Response.WriteFile(filePath)
    Response.End()
End Sub

Protected Sub DeleteFile(ByVal sender As Object, ByVal e As EventArgs)
    Dim filePath As String = TryCast(sender, LinkButton).CommandArgument
    File.Delete(filePath)
    Response.Redirect(Request.Url.AbsoluteUri)
End Sub

Protected Sub OnRefresh(ByVal sender As Object, ByVal e As EventArgs)
    BindGridView()
End Sub

Private Sub BindGridView()
    Dim filePaths As String() = Directory.GetFiles(Server.MapPath("~/documents/"))
    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

    gvFiles.DataSource = files
    gvFiles.DataBind()
End Sub

Private Sub ClearContents(ByVal control As Control)
    For i = 0 To Session.Keys.Count - 1
        If Session.Keys(i).Contains(control.ClientID) Then
            Session.Remove(Session.Keys(i))
            Exit For
        End If
    Next
End Sub

Screenshot