Visual Basic method or operation not performed?

Question

Visual Basic

Public Class Form1

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        OpenFileDialog1.Title = "Select File"
        OpenFileDialog1.Filter = "All files(*.*)|*.*"
        OpenFileDialog1.CheckPathExists = "True"
        OpenFileDialog1.CheckFileExists = "True"

    End Sub

    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        OpenFileDialog1.ShowDialog()
        TextBox1.Text = OpenFileDialog1.FileName
    End Sub

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Try
            If TextBox1 = Acct_NoTextbox.Text Then
                MsgBox("Select file for get size!")
            Else
                If System.IO.File.Exists(TextBox1.Text) = True Then
                    Dim file As System.IO.FileInfo
                    file = My.Computer.FileSystem.GetFileInfo(TextBox1.Text)
                    MessageBox.Show(file.Length & "Bytes")
                Else
                    MsgBox("Thise file is not existes on your PC")
                End If
            End If
        Catch ex As Exception
            MsgBox(ex.Message)
        End Try
    End Sub

End Class

Answer 1

I see the code, the question is not clear. We need more letters, preferably in the form of words that form sentences filled with meaning :)
According to the code, here:

Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
    OpenFileDialog1.ShowDialog()
    TextBox1.Text = OpenFileDialog1.FileName
End Sub

There is no dialog result handler. Should be something like:

Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
    ' если пользователь не захотел выбирать файл, выходим
    If Not OpenFileDialog1.ShowDialog() = System.Windows.Forms.DialogResult.OK Then Return 
    ' пользователь выбрал файл
    TextBox1.Text = OpenFileDialog1.FileName
End Sub

Here in this line:
It is better to explicitly specify the Text property when checking the value of the TextBox1 element :
Although, if you make the OpenFileDialog work normally , as I showed above, then this condition should not be needed at all. Well, or you can just check for the presence of a value in TextBox1 :

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
      Try
            ' если значение TextBox1.Text - пустая строка или Nothing, то
            If String.IsNullOrEmpty(TextBox1.Text) Then 
                MessageBox.Show("Select file for get size!")
                Return ' выходим
            End If

            'можно сразу создать FileInfo и проверять существование файла через него
            Dim file As New System.IO.FileInfo(TextBox1.Text)
            If file.Exists Then
                MessageBox.Show(file.Length & "Bytes")
            Else
                MessageBox.Show("Thise file is not existes on your PC")
            End If
      Catch ex As Exception
            MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
      End Try
End Sub