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Deleting a file using ASP.NET 2.0 and VB .NET
This tutorial will show you how to delete 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.
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To delete a simple file on the disk, we will need to first import the System.IO namespace. The System.IO namespace contains the File.Delete() method and FileInfo type that we will use to perform our delete with.
We'll put our code in the btnSubmit_Click() event.
When the btnSubmit_Click() event fires it first checks to see if the file exists using the FileInfo type. If it exists it runs the File.Delete() method to delete it, otherwise it throws a FileNotFoundException which is caught by one of the catch statements below the try block.
Protected Sub btnSubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSubmit.Click
Try
Dim TheFile As FileInfo = New FileInfo(MapPath(".") & "\" & txtFile.Text) If TheFile.Exists Then
File.Delete(MapPath(".") & "\" & txtFile.Text) Else
Throw New FileNotFoundException() End If Catch ex As FileNotFoundException
lblStatus.Text += ex.Message Catch ex As Exception
lblStatus.Text += ex.Message End Try |
We have one textbox,a Submit button, a label, and a checkbox on the front end for user interaction. The front end .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 to Delete:</td> <td align="center" bgcolor="#FFFFFF"> <asp:TextBox ID="txtFile" runat="server"></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 is 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 TheFile As FileInfo = New FileInfo(MapPath(".") & "\" & txtFile.Text) If TheFile.Exists Then
File.Delete(MapPath(".") & "\" & txtFile.Text) Else
Throw New FileNotFoundException() End If Catch ex As FileNotFoundException
lblStatus.Text += ex.Message Catch ex As Exception
lblStatus.Text += ex.Message End Try
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
End Sub
End Class |
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