Member Avatar for CityThrille

Good day to all.


How can I transfer entries from listview to disk using System.io?


Help is appreciated. Thank you. :-/

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  • Latest Post Latest Post by codeorder

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A concise, practical way to save an ASP.NET WebForms ListView to a server-side text file, plus common pitfalls to watch for. This expands on 's goal (plain-text export) and the setup hinted at by .

Protected Sub btnSave_Click(sender As Object, e As EventArgs) Handles btnSave.Click
    Dim sb As New System.Text.StringBuilder()

    For Each item As ListViewDataItem In ListView1.Items
        Dim lbl As Label = TryCast(item.FindControl("lblField1"), Label) 'replace with actual control IDs
        If lbl IsNot Nothing Then
            sb.AppendLine(lbl.Text)
        End If
    Next

    Dim filename As String = String.Format("listview_{0:yyyyMMddHHmmss}.txt", DateTime.Now)
    Dim path As String = Server.MapPath("~/App_Data/" & filename)

    System.IO.File.WriteAllText(path, sb.ToString(), System.Text.Encoding.UTF8)
End Sub

Notes and troubleshooting:

  • Replace "lblField1" with the actual control IDs inside the ListView ItemTemplate. If the values are in the data source (not rendered controls), iterate the data source instead for cleaner code.
  • Use Server.MapPath("~/App_Data/...") or a dedicated folder outside the web root. App_Data is writable by default in many hosts and safer than the site root.
  • If an "access denied" error occurs, grant write/modify permission to the application identity (application pool account) for the target folder.
  • For concurrent users, avoid a single static filename: include a timestamp or user identifier, or synchronize writes (lock) to prevent file corruption.
  • For direct download without storing on disk, stream the text to the response with Response.ContentType = "text/plain" and Content-Disposition: attachment.
  • For large exports, write incrementally using a StreamWriter inside a Using block to reduce memory pressure.

Security caution: sanitize any user-provided text before writing to disk and avoid placing sensitive files where they can be served directly by IIS.

Recommended Answers

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Member Avatar for CityThrille

And, sorry sir, I forgot.

I want to save all listview entries in disk as text file.

Member Avatar for codeorder

See if this thread helps.
You will need 1 ListView and 1 Button in a New Project.
If you currently have a "C:\test.txt" File, delete it prior to running the code.

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