Writing a file to disk using ASP.NET 2.0 and VB .NET

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

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.

Imports System.IO

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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 Sub btnSubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSubmit.Click Try Dim sw As StreamWriter = File.CreateText(MapPath("myFile.txt")) sw.WriteLine(txtFile.Text) sw.Close() Catch ex As IOException lblStatus.Text += ex.Message End Try End Sub

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

<table width="600" border="0" align="center" cellpadding="5" cellspacing="1" bgcolor="#cccccc"> <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 /> &nbsp; <asp:label ID="lblStatus" runat="server"></asp:label></td> </tr> </table>

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The flow for the code behind page as follows.

Imports System.IO Partial Class _Default Inherits System.Web.UI.Page Protected Sub btnSubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSubmit.Click Try Dim sw As StreamWriter = File.CreateText(MapPath("myFile.txt")) sw.WriteLine(txtFile.Text) sw.Close() Catch ex As IOException lblStatus.Text += ex.Message End Try End Sub Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load End Sub End Class

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