This tutorial will show you how to write to a file on the disk using ASP.NET 2.0 and C#.NET
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.
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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 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;
} |
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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 />
<asp:label ID="lblStatus" runat="server"></asp:label></td>
</tr> |
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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;
}
} |
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