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How to upload a file to a Web server in ASP.NET by using c# (C Sharp)

Posted Date: 30 May 2006	Resource Type: Articles	Category: .NET Framework
Author: krishna reddy yerram	Member Level: Bronze
Rating:	Points: 7

Modify the WebForm1.aspx page
To modify the HTML code of the WebForm1.aspx file to permit users to upload files, follow these steps:
1. Return to the open instance of Visual Studio .NET. WebForm1.aspx should be open in the Designer window.

2. To view the HTML source of the WebForm1.aspx page, right-click WebForm1.aspx in the Designer window, and then click View HTML Source.

3. Locate the following HTML code, which contains the tag:

4. Add the enctype="multipart/form-data" name-value attribute to the "form" tag in the HTML source as follows:< form id="Form1" method="post" enctype="multipart/form-data" runat="server" / >

5. Verify that the HTML tag appears as follows:
< form id="Form1" method="post" enctype="multipart/form-data" runat="server">
< INPUT type=file id=File1 name=File1 runat="server" />
< br>
< input type="submit" id="Submit1" value="Upload" runat="server" />
< / form>

Add the upload code to the WebForm1.aspx.vb code-behind file
protected void Submit1_ServerClick(object sender, EventArgs e)
{

if (File1.PostedFile != null && File1.PostedFile.ContentLength > 0)
{
String fn = null;
fn = System.IO.Path.GetFileName( File1.PostedFile.FileName);
String SaveLocation = null;
SaveLocation = Server.MapPath(fn);
File1.PostedFile.SaveAs(SaveLocation);
Response.Write("The file has been uploaded.");
}
else
{
Response.Write("Please select a file to upload.");
}}

Upload larger files

By default, ASP.NET permits only files that are 4,096 kilobytes (KB) (or 4 megabytes [MB]) or less to be uploaded to the Web server. To upload larger files, you must change the maxRequestLength parameter of the section in the Web.config file.

Note When the maxRequestLength attribute is set in the Machine.config file and then a request is posted (for example, a file upload) that exceeds the value of maxRequestLength, a custom error page cannot be displayed. Instead, Microsoft Internet Explorer will display a "Cannot find server or DNS" error message.

If you want to change this setting for all of the computer and not just this ASP.NET application, you must modify the Web.config file.

By default, the element is set to the following parameters in the Web.config file:
< httpRuntime executionTimeout="90" maxRequestLength="4096"
useFullyQualifiedRedirectUrl="false" minFreeThreads="8"
minLocalRequestFreeThreads="4" appRequestQueueLimit="100" />

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