How to perform a File Upload using ASP.NET 2.0 and C# .NET

Categories

Advanced Technologies

User Interface and Themes

Navigator: Home - Tutorials - File - Writing a file to disk using ASP.NET 2.0 and C# .NET

Writing a file to disk using ASP.NET 2.0 and C# .NET

ASP.NET File Tutorial

This tutorial will show you how to write to a file on the disk using ASP.NET 2.0 and C#.NET

Download the Full Working Version of this Project written with Visual Studio.NET C# .NET 2005 Here!

Looking for the VB.NET 2005 Version? Click Here!

Looking for more ASP.NET Tutorials? Click Here!

The .NET Framework offers a number of types that makes accessing resources on filesystems easy to use.

To write a simple file to the disk, we will need to first import the System.IO namespace. The System.IO namespace contains the StreamWriter type that we will use to perform our disk write.

using System.IO

We'll put our code in the btnSubmit_Click() event.

When the btnSubmit_Click() event fires it executes the File.CreateText method with a parameter specifying the path and name of the file which we would like to write to, it also returns a StreamWriter object instance which we then execute the WriteLine and Close methods on.

protected void btnSubmit_Click(object sender, EventArgs e)
{

try {
StreamWriter sw = File.CreateText(MapPath("myFile.txt"));
sw.WriteLine( txtFile.Text );
sw.Close();
}
catch (IOException ex) {

lblStatus.Text += ex.Message;

}

The front end Default.aspx page looks something like this:

<tr>

<td width="100" align="right" bgcolor="#eeeeee" class="header1"> File Content:</td>
<td align="center" bgcolor="#FFFFFF">
<asp:TextBox ID="txtFile" runat="server" TextMode="MultiLine"></asp:TextBox><br />
<asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClick="btnSubmit_Click" /><br />  
<asp:label ID="lblStatus" runat="server"></asp:label></td>

</tr>

</table>

The flow for the code behind page as follows.

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;

public partial class _Default : System.Web.UI.Page
{

protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnSubmit_Click(object sender, EventArgs e)
{

try {
StreamWriter sw = File.CreateText(MapPath("myFile.txt"));
sw.WriteLine( txtFile.Text );
sw.Close();
}
catch (IOException ex) {

lblStatus.Text += ex.Message;

}

Download the Full Working Version of this Project written with Visual Studio.NET C# .NET 2005 Here!

Looking for the VB.NET 2005 Version? Click Here!

Looking for more ASP.NET Tutorials? Click Here!


Developer Resources