This article will describe two different ways to upload file in asp.net
2 ways to upload file in ASP.NET C#
Dear reader, In this article we are going to look into two different
style to upload file in asp.net application. In first approach, we will see traditional way to upload file using asp.net file uploader control and in
second approach we will see how to implement asynchronous file uploading using
AJAX.
Let’s start with first approach.
Upload
file using file uploader
This is traditional way to upload file . We will
drag and drop file uploader control and in buttons click we will write code to
upload file. Here is code for aspx page.
<%@
Page Language="C#" AutoEventWireup="true" CodeFile="InFileSystem.aspx.cs" Inherits="InFileSystem"
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
</div>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
</form>
</body>
</html>
For sake of simplicity whole
C# page code is not posted. Just keep those few line in upload button’s click event.
protected void Button1_Click(object
sender, EventArgs e)
{
String Filename = FileUpload1.PostedFile.FileName;
if (this.FileUpload1.HasFile)
{
FileUpload1.SaveAs(Server.MapPath("Uploads/") + Filename);
Response.Write("File Uploaded");
}
}
And don’t forget to create Uploads folder under your
root directory. And after uploading any file you will find the uploaded file in
Uploads directory.
This is traditional approach to upload file. In next
example we will see how to implement asynchronous file upload using ajax.
Upload
file using AJAX File Uploader Control
Before go through of this part I will recommend you
to get basic idea of ajax in asp.net if you don’t have still. Here I will show
how to implement asynchronous file uploader using asp.net ajax. Let’s start and
see how to do that?
Here is my .aspx page .
<%@
Page Language="C#" AutoEventWireup="true"
CodeFile="CS.aspx.cs"
Inherits="_Default"
%>
<%@
Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit"
TagPrefix="cc1"
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type = "text/javascript">
function
uploadComplete(sender) {
clearContents(sender._element.id);
}
function clearContents(id) {
var AsyncFileUpload = $get(id);
var txts = AsyncFileUpload.getElementsByTagName("input");
for(var i = 0; i < txts.length; i++) {
if(txts[i].type == "text") {
txts[i].value = "";
txts[i].style.backgroundColor = "white";
}
}
}
function uploadError(sender, args) {
alert("File not supported");
}
function uploadStart(sender, args)
{
var filename = args.get_fileName();
var filext = filename.substring(filename.lastIndexOf(".")+ 1);
if(filext == "jpg" || filext == "gif" || filext == "png")
{
return true;
}
else{
var err = new Error();
err.name = 'My API Input Error';
err.message = 'Only .jpg, .gif, .png files';
throw(err);
return false;
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<cc1:AsyncFileUpload
OnClientUploadStarted="uploadStart"
OnClientUploadError="uploadError"
OnClientUploadComplete="uploadComplete"
OnUploadedComplete = "FileUploadComplete"
runat="server" ID="AsyncFileUpload1" Width="302px" UploaderStyle="Modern"
CompleteBackColor = "White"
UploadingBackColor="#CCFFFF" ThrobberID="imgLoader"
Height="23px"
/>
<asp:Image ID="imgLoader" runat="server" ImageUrl= "~/images/loader.gif"/>
<br />
<asp:Label ID="lblMesg" runat="server" Text=""></asp:Label>
</form>
</body>
</html>
If you
observe this code you will find in uploadStart() function is to check the file
type. Currently it will allow to upload only image type . So according to your
need you can tune up that function.
And please don’t forget to register ajax control in
your current aspx page by writing below line
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
in head section in aspx page. Now we will see
content of .CS file. In below I have given code for saving uploaded file in
folder.
protected void FileUploadComplete(object sender, EventArgs e)
{
string filename = System.IO.Path.GetFileName(AsyncFileUpload1.FileName);
AsyncFileUpload1.PostedFile.SaveAs(Server.MapPath("Uploads/") + filename);
}
And again please don’t forget to
Create Uploaded folder in your root directory.
