Upload more than one file aspx.net C#

Question

I have the following HTML source:

 <form name="AddTrack" id="add_track_form" action="AddTrack.aspx" method="post" runat="server">


       <input type="file" name="file1"/><br />
            <input type="file" style="margin-right: 52px;" name="file2" /><br />
            <input type="file" style="margin-right: 52px;" name="file3" /><br />
            <input type="file" style="margin-right: 52px;" name="file4" /><br />
        <button type="submit" class="blue-button">הוסף מסלול</button>
    </form>

With this ASPX - C# code:

if (Request.ContentLength != 0)
{
    int Size = Request.Files[0].ContentLength / 1024;
    if (Size <= 512)
    {

        string LocalFile = Request.Files[0].FileName;
        int LastIndex = LocalFile.LastIndexOf(@"\") + 1;
        string File = LocalFile.Substring(LastIndex, LocalFile.Length - LastIndex);
        string Path = Server.MapPath(" ../images/tracks") + "..\\" + File;
        Request.Files[0].SaveAs(Path);
        Response.Write(@"The file was saved: " + Path);
    }
    else
    {
        Response.Write("The file is too big !");
    }
}
else
{
    Response.Write("Unknown Error !");
}

If I upload one file it works great, but I upload there is more than one upload input it don't work.

My question is why and how can I fix it?

Answer 1

As far as I can see, you just need to add enctype="multipart/form-data" to your form:

 <form name="AddTrack" id="add_track_form" action="AddTrack.aspx" method="post" runat="server" enctype="multipart/form-data">

http://www.w3.org/TR/html401/interact/forms.html#h-17.13.4.2

The content type "application/x-www-form-urlencoded" is inefficient for sending large quantities of binary data or text containing non-ASCII characters. The content type "multipart/form-data" should be used for submitting forms that contain files, non-ASCII data, and binary data.

You are not using asp:FileUpload control which adds that enctype automatically, so you should do that manually.

for(int i = 0; i < Request.Files.Count; i++) {

    int Size = Request.Files[i].ContentLength / 1024;
    if (Size <= 512)
    {
       string LocalFile = Request.Files[i].FileName;
    //.....
}