Convert HttpPostedFile to byte array and Save as file using C# and VB.Net in ASP.Net

Hi itsjayshah,

I have checked the code its working.

Check this example. I have also added a link to download the uploaded file.

HTML

<asp:FileUpload ID="flnUploadImage" runat="server" AllowMultiple="true" />
<asp:Button ID="btnUpload" runat="server" Text="Upload" OnClick="Upload" />
<br />
<asp:GridView ID="gvFiles" runat="server" AutoGenerateColumns="false">
    <Columns>
        <asp:BoundField DataField="Text" HeaderText="File Name" />
        <asp:TemplateField HeaderText="Action">
            <ItemTemplate>
                <asp:LinkButton ID="lnkDownload" Text="Download" CommandArgument='<%# Eval("Value") %>'
                    runat="server" OnClick="DownloadFile"></asp:LinkButton>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

Namespaces

C#

using System.IO;

VB.Net

Imports System.IO

Code

C#

protected void Upload(object sender, EventArgs e)
{
    if (flnUploadImage.HasFiles)
    {
        foreach (HttpPostedFile postedFile in flnUploadImage.PostedFiles)
        {
            Stream fs = postedFile.InputStream;
            BinaryReader br = new BinaryReader(fs);
            byte[] bytes = br.ReadBytes((Int32)fs.Length);
            //Save the Byte Array as File.
            string filePath = "~/Files/" + Path.GetFileName(postedFile.FileName);
            File.WriteAllBytes(Server.MapPath(filePath), bytes);
        }
    }

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


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 Upload(ByVal sender As Object, ByVal e As EventArgs)
    If flnUploadImage.HasFiles Then
        For Each postedFile As HttpPostedFile In flnUploadImage.PostedFiles
            Dim fs As Stream = postedFile.InputStream
            Dim br As BinaryReader = New BinaryReader(fs)
            Dim bytes As Byte() = br.ReadBytes(CType(fs.Length, Int32))
            Dim filePath As String = "~/Files/" & Path.GetFileName(postedFile.FileName)
            File.WriteAllBytes(Server.MapPath(filePath), bytes)
        Next
    End If

    Dim filePaths As String() = Directory.GetFiles(Server.MapPath("~/Files/"))
    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

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