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Simple download file example. Works with http, https, and ftp. If username and password are required add them to the client using System.Net.NetworkCredential(“username”, “password”).

Use the WebClient DownloadProgressChanged and DownloadFileCompleted events to display percent and start on finish action.

These examples will not work unless you create a winform to go along with them.

VB.net

Imports System.IO
Imports System.Net
Imports System.Threading
Imports System.Text

Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDownload.Click
        download(txtDownloadPath.Text.Trim, txtSavePath.Text.Trim)
    End Sub

    Private Shared percent As Integer = 0

    Public Sub Download(ByVal urlPath As String, ByVal savePath As String)
        Dim client As WebClient = New WebClient()
        'client.Credentials = New System.Net.NetworkCredential("username", "password")

        AddHandler client.DownloadProgressChanged, AddressOf ClientDownloadProgressChanged
        AddHandler client.DownloadFileCompleted, AddressOf ClientDownloadFileCompleted

        client.DownloadFileAsync(New Uri(urlPath), savePath)

    End Sub

    Private Sub ClientDownloadProgressChanged(ByVal sender As Object, ByVal e As DownloadProgressChangedEventArgs)

        Dim bytesIn As Double = Double.Parse(e.BytesReceived.ToString())
        Dim totalBytes As Double = Double.Parse(e.TotalBytesToReceive.ToString())
        Dim percentage As Double = bytesIn / totalBytes * 100

        ProgressBar1.Value = Integer.Parse(Math.Truncate(percentage).ToString())
        PaintProgressBarPercent(ProgressBar1)
    End Sub

    Private Sub ClientDownloadFileCompleted(ByVal sender As Object, ByVal e As EventArgs)
        'AsyncCompletedEventArgs
        MessageBox.Show("Download Completed")
    End Sub

    Private Sub PaintProgressBarPercent(ByRef a As ProgressBar)
        Dim percent As Integer = CInt(((CDbl((ProgressBar1.Value - ProgressBar1.Minimum)) / CDbl((ProgressBar1.Maximum - ProgressBar1.Minimum))) * 100))

        Using gr As Graphics = ProgressBar1.CreateGraphics()
            Dim p1 As New PointF(CType(a.Width / 2 - (gr.MeasureString(percent & "%", SystemFonts.DefaultFont).Width / 2.0F), Single), CType(a.Height / 2 - (gr.MeasureString(percent & "%", SystemFonts.DefaultFont).Height / 2.0F), Single))
            Try
                gr.DrawString(percent & "%", SystemFonts.DefaultFont, Brushes.Black, p1)
            Catch ex As Exception
            End Try

        End Using

    End Sub

End Class

C# Example

using System.IO;
using System.Net;
using System.Threading;
using System.Text;

public class Form1
{
    private void Button1_Click(System.Object sender, System.EventArgs e)
    {
        download(txtDownloadPath.Text.Trim, txtSavePath.Text.Trim);
    }
    
    private static int percent = 0;
    
    public void Download(string urlPath, string savePath)
    {
        WebClient client = new WebClient();
        //client.Credentials = New System.Net.NetworkCredential("username", "password")
        
        client.DownloadProgressChanged += ClientDownloadProgressChanged;
        client.DownloadFileCompleted += ClientDownloadFileCompleted;
        
            
        client.DownloadFileAsync(new Uri(urlPath), savePath);
    }
    
    
    private void ClientDownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
    {
        
        double bytesIn = double.Parse(e.BytesReceived.ToString());
        double totalBytes = double.Parse(e.TotalBytesToReceive.ToString());
        double percentage = bytesIn / totalBytes * 100;
        
        ProgressBar1.Value = int.Parse(Math.Truncate(percentage).ToString());
            
        PaintProgressBarPercent(ProgressBar1);
    }
    
    
    private void ClientDownloadFileCompleted(object sender, EventArgs e)
    {
        //AsyncCompletedEventArgs
        MessageBox.Show("Download Completed");
    }
    
    
    
    private void PaintProgressBarPercent(ref ProgressBar a)
    {
        int percent = (int)(((double)(ProgressBar1.Value - ProgressBar1.Minimum) / (double)(ProgressBar1.Maximum - ProgressBar1.Minimum)) * 100);
        
        using (Graphics gr = ProgressBar1.CreateGraphics()) {
            PointF p1 = new PointF((float)a.Width / 2 - (gr.MeasureString(percent + "%", SystemFonts.DefaultFont).Width / 2f), (float)a.Height / 2 - (gr.MeasureString(percent + "%", SystemFonts.DefaultFont).Height / 2f));
            try {
                gr.DrawString(percent + "%", SystemFonts.DefaultFont, Brushes.Black, p1);
            }
            catch (Exception ex) {
                
            }
            
        }
    }
}


The following code is a partial example of using backgroundworker ReportProgress method to access controls from the backgroundworker thread.

The form has one button called Button2. When the form is activated it creates a balloon tooltip message for 5 seconds on it.

These examples will not work unless you create a winform to go along with them.

VB.NET Example

Imports System.ComponentModel
Public Class Form1

    Dim bwCheckForUpdates As BackgroundWorker

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        ToolTip1.SetToolTip(Button2, "An update is available.")
    End Sub

    Private Sub Form1_Activated(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Activated

        bwCheckForUpdates = New BackgroundWorker()
        bwCheckForUpdates.WorkerReportsProgress = True
        AddHandler bwCheckForUpdates.ProgressChanged, AddressOf bwCheckForUpdates_ProgressChanged
        AddHandler bwCheckForUpdates.DoWork, AddressOf bwCheckForUpdates_DoWork
        bwCheckForUpdates.RunWorkerAsync()

    End Sub

    Private Sub bwCheckForUpdates_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
        ' Check for update
        ' if available call bwCheckForUpdates.ReportProgress(100, True) with value of true
        bwCheckForUpdates.ReportProgress(100, True)

    End Sub
    Private Sub bwCheckForUpdates_ProgressChanged(ByVal sender As System.Object, ByVal e As System.ComponentModel.ProgressChangedEventArgs) Handles BackgroundWorker1.ProgressChanged
        If CType(e.UserState, Boolean) = True Then
            ToolTip1.Show("An update is available.", Button2, 5000)
        End If
    End Sub


End Class

C# Example

using System.ComponentModel;

public class Form1
{
    BackgroundWorker bwCheckForUpdates;
    
    private void  Button1_Click(System.Object sender, System.EventArgs e)
    {
        Balloon b = new Balloon();
        b.Show();
    }
    
    private void Form1_Load(System.Object sender, System.EventArgs e)
    {
        ToolTip1.SetToolTip(Button2, "An update is available.");
    }
    
    private void  Form1_Activated(System.Object sender, System.EventArgs e)
    {
        
        bwCheckForUpdates = new BackgroundWorker();
        bwCheckForUpdates.WorkerReportsProgress = true;
        bwCheckForUpdates.ProgressChanged += bwCheckForUpdates_ProgressChanged;
        bwCheckForUpdates.DoWork += bwCheckForUpdates_DoWork;
            
        bwCheckForUpdates.RunWorkerAsync();
    }
    
    private void bwCheckForUpdates_DoWork(System.Object sender, System.ComponentModel.DoWorkEventArgs e)
    {
        // Check for update
        // if available call bwCheckForUpdates.ReportProgress(100, True) with value of true
            
        bwCheckForUpdates.ReportProgress(100, true);
    }
    private void  bwCheckForUpdates_ProgressChanged(System.Object sender, System.ComponentModel.ProgressChangedEventArgs e)
    {
        if ((bool)e.UserState == true) {
            ToolTip1.Show("An update is available.", Button2, 5000);
        }
    }
   
}


MessageDialog m = new MessageDialog(this, DialogFlags.Modal, MessageType.Info, ButtonsType.YesNo, false, 
    "Should the textbox be set to Hello World");
ResponseType result = (ResponseType)m.Run();
m.Destroy();
		
if (result == ResponseType.Yes)
{
	entry1.Text = "Hello World";
}

Cocaine Cowgirl, O Holy Night, and I Don’t want to miss a Thing are progressing nicely.


Book List: Precalculus - It has been seven years since I have done math, so I will start with this. Calculus Made Easy Applied Cryptography PostgreSQL - Finish few remaining chapters Data Structures and Problem Solving Using Java Programming Linux Games Bookkeeping and Accounting Nemsis

Guitar: 10 new songs that I will be learning are: Everlong - foo fighters Cocaine Cowgirls - Matt Mays I don’t want to miss a thing - aerosmith 1979 - smashing pumpkins (I do believe I used to know this one) Killer in me - smashing pumpkins Heart of Gold - Neil Young O Holy Night …..