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form not responding and the progress bar not loading.

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Need some help, when im uploading the form stops responding and the progress bar is not loading. someone can help me in this problem. Thank you so much for advance :) -> Heres my whole code

Code:

    Imports System
   
   
    Public Class Form1
        Public filenameOnly As String
        Public FN As String
        Public FN4 As String
   
   
   
        Public Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
   
            Using ofd As New OpenFileDialog()
                If ofd.ShowDialog() = DialogResult.OK Then
   
   
   
                    FN = ofd.FileName
                    TextBox3.Text = FN
                    Dim filePath As String = FN
                    Dim slashPosition As ULong = filePath.LastIndexOf("\")
                    filenameOnly = filePath.Substring(slashPosition + 1)
   
   
   
                End If
            End Using
        End Sub
   
   
        Public Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
            Application.DoEvents()
            Timer1.Start()
            Button1.Enabled = False
            Dim request As System.Net.FtpWebRequest = DirectCast(System.Net.WebRequest.Create("ftp://localhost/" + filenameOnly), System.Net.FtpWebRequest)
            request.Credentials = New System.Net.NetworkCredential(TextBox1.Text, TextBox2.Text)
            request.Method = System.Net.WebRequestMethods.Ftp.UploadFile
   
   
            Try
                Dim file() As Byte = System.IO.File.ReadAllBytes(TextBox3.Text)
                Dim strz As System.IO.Stream = request.GetRequestStream()
                Dim fsl = file.Length
   
   
                ProgressBar1.Value = 0
   
                If fsl <> 0 Then
   
                    For offset As ULong = 1 To file.Length Step 163840000000
   
   
   
                        ProgressBar1.Value = CType(offset * 100 / fsl, ULong)
   
   
                        Dim chunkSize As ULong = file.Length - offset - 1
   
   
                        If chunkSize > 16384000000000000 Then chunkSize = 16384000000000000
                        strz.Write(file, offset, chunkSize)
   
                    Next
   
                    strz.Close()
                    strz.Dispose()
                    Timer1.Stop()
   
                    ProgressBar1.Value = ProgressBar1.Maximum
                    If ProgressBar1.Value = 100 Then
                        Button1.Enabled = True
                        MessageBox.Show("Upload Successful!")
   
                        ProgressBar1.Value = 0
                        Button2.Enabled = True
                        TextBox3.Text = ""
                        Application.Restart()
   
   
   
                    End If
                Else
                    MessageBox.Show("You cannot Upload a null file")
                    Button1.Enabled = True
                End If
            Catch
                ProgressBar1.Value = 0
                Timer1.Stop()
   
                MessageBox.Show("Invalid Username or Password!")
                If TextBox3.Text = "" Then
   
                    MessageBox.Show("Please browse for any file!")
                End If
   
   
   
   
            End Try
   
   
   
   
        End Sub
   
   
   
   
        Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
           
            System.Windows.Forms.Application.DoEvents()
   
            Button1.Enabled = False
            TextBox3.Enabled = False
            Button3.Enabled = False
            ' make a reference to a directory
            Dim di As New IO.DirectoryInfo("C:\Users\user\Desktop\Files FTP\")
            Dim diar1 As IO.FileInfo() = di.GetFiles()
            Dim dra As IO.FileInfo
            Dim sum As Integer = 0
   
            'list the names of all files in the specified directory
            For Each dra In diar1
                sum += 1
                ListBox1.Items.Add(dra)
            Next
   
            ListBox1.Items.Remove(sum)
   
   
        End Sub
   
        Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
            ProgressBar1.Increment(1)
   
   
   
        End Sub
   
        Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
   
            If TextBox1.Text = "" Or TextBox2.Text = "" Then
                Button1.Enabled = False
            Else
                Button1.Enabled = True
            End If
   
        End Sub
   
        Private Sub TextBox2_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox2.TextChanged
   
            If TextBox1.Text = "" Or TextBox2.Text = "" Then
                Button1.Enabled = False
            Else
                Button1.Enabled = True
            End If
   
        End Sub
   
        Private Sub ListBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
            Button3.Enabled = True
            FN4 = ListBox1.Text
   
        End Sub
   
        Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
   
   
        End Sub
   
        Private Sub Button3_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
            Kill("C:\Users\user\Desktop\Files FTP\" + FN4)
   
            Application.Restart()
   
        End Sub
   
        Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
            Kill("C:\Users\user\Desktop\Files FTP\*.*")
            Application.Restart()
        End Sub
   
        Private Sub ProgressBar1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ProgressBar1.Click
   
        End Sub
   
    End Class


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