VB.Net Tutorial/GUI/OpenFileDialog

File Open/Save dialog

Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class FileSaveOpenDialog
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Inherits System.Windows.Forms.Form
    Public Sub New()
        MyBase.New()
        InitializeComponent()
    End Sub
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    Private components As System.ruponentModel.IContainer
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog
    Friend WithEvents SaveFileDialog1 As System.Windows.Forms.SaveFileDialog
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog
        Me.SaveFileDialog1 = New System.Windows.Forms.SaveFileDialog
        Me.SuspendLayout()
        "
        "Button1
        "
        Me.Button1.Location = New System.Drawing.Point(32, 32)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(88, 32)
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "Open"
        "
        "Button2
        "
        Me.Button2.Location = New System.Drawing.Point(160, 32)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(88, 32)
        Me.Button2.TabIndex = 1
        Me.Button2.Text = "Save"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 110)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.Button1)
        Me.ResumeLayout(False)
    End Sub
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        OpenFileDialog1.ShowDialog()
    End Sub
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        SaveFileDialog1.ShowDialog()
    End Sub
End Class

Get selected file name in a OpenFileDialog

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class OpenFileDialogSelectedFileName
   public Shared Sub Main
        Dim FileDB As New OpenFileDialog()
        If (FileDB.ShowDialog() = DialogResult.OK) Then
            Console.WriteLine("File: " & FileDB.FileName)
        Else
            Console.WriteLine("User selected Cancel")
        End If
   End Sub
End class

Open File Dialog Filter

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class PictureBoxImageFromOpenFileDialog
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Inherits System.Windows.Forms.Form
    Public Sub New()
        MyBase.New()
        InitializeComponent()
    End Sub
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    Private components As System.ruponentModel.IContainer
    Friend WithEvents PictureBox1 As System.Windows.Forms.PictureBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.PictureBox1 = New System.Windows.Forms.PictureBox
        Me.Button1 = New System.Windows.Forms.Button
        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog
        Me.SuspendLayout()
        "
        "PictureBox1
        "
        Me.PictureBox1.Location = New System.Drawing.Point(16, 16)
        Me.PictureBox1.Name = "PictureBox1"
        Me.PictureBox1.Size = New System.Drawing.Size(248, 176)
        Me.PictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize
        Me.PictureBox1.TabIndex = 0
        Me.PictureBox1.TabStop = False
        "
        "Button1
        "
        Me.Button1.Location = New System.Drawing.Point(96, 208)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(88, 24)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "Open"
        "
        "OpenFileDialog1
        "
        Me.OpenFileDialog1.Filter = "bmp(*.bmp)|*.bmp"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 266)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.PictureBox1)
        Me.ResumeLayout(False)
    End Sub
    
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim pic As Image
        OpenFileDialog1.ShowDialog()
        pic = New Bitmap(OpenFileDialog1.FileName)
        PictureBox1.Image = pic
    End Sub
End Class

Prevent dialog box from validating file

Imports System.IO
Imports System.Windows.Forms
Module Module1
    Sub Main()
        Dim FileDB As New OpenFileDialog()
        FileDB.Filter = "All files | *.* | Text files | *.txt"
        FileDB.FilterIndex = 2
        FileDB.InitialDirectory = "C:\Temp"
        FileDB.AddExtension = True
        FileDB.DefaultExt = "txt"
        " Prevent dialog box from validating file
        FileDB.CheckFileExists = False
        FileDB.CheckPathExists = False
        If (FileDB.ShowDialog() = DialogResult.OK) Then
            Dim SourceFile As StreamReader
            Try
                SourceFile = New StreamReader(FileDB.FileName)
                Console.WriteLine(SourceFile.ReadToEnd())
                SourceFile.Close()
            Catch Except As Exception
                Console.WriteLine("Error: " & Except.Message)
            End Try
        Else
            Console.WriteLine("User selected Cancel")
        End If
    End Sub
End Module

Set InitialDirectory and FilterIndex for OpenFileDialog

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class OpenFileDialogInitDirectory
   public Shared Sub Main
        Dim FileDB As New OpenFileDialog()
        FileDB.Filter = "All files | *.* | Word files | *.doc | Text files | *.txt"
        FileDB.FilterIndex = 3
        FileDB.InitialDirectory = "C:\Temp"
        If (FileDB.ShowDialog() = DialogResult.OK) Then
            Console.WriteLine("File: " & FileDB.FileName)
        Else
            Console.WriteLine("User selected Cancel")
        End If
   End Sub
End class

Set OpenFileDialog Filter and get selected file name

Imports System.Windows.Forms
public class FileOpenDialogFilter
   public Shared Sub Main
        Dim openFileDialog1 As System.Windows.Forms.OpenFileDialog
        openFileDialog1 = New System.Windows.Forms.OpenFileDialog()
        
        openFileDialog1.Filter = "Word (*.doc) |*.doc;*.rtf|(*.txt) |*.txt|(*.*) |*.*"
        If openFileDialog1.ShowDialog() = DialogResult.OK Then
            Console.WriteLine(openFileDialog1.FileName)
        End If
   End Sub
End class

Use OpenFileDialog to load image to PictureBox

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class OpenFileDialogPicture
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
    Public Sub New()
        MyBase.New()
        "This call is required by the Windows Form Designer.
        InitializeComponent()
        "Add any initialization after the InitializeComponent() call
    End Sub
    "Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents PictureBox1 As System.Windows.Forms.PictureBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog
        Me.Button1 = New System.Windows.Forms.Button
        Me.PictureBox1 = New System.Windows.Forms.PictureBox
        Me.SuspendLayout()
        "
        "OpenFileDialog1
        "
        Me.OpenFileDialog1.Filter = "JPEG files (*.jpg)|*.jpg|GIF files (*.gif)|*.gif|All files (*.*)|*.*"
        "
        "Button1
        "
        Me.Button1.Location = New System.Drawing.Point(96, 88)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(88, 23)
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "Show Dialog"
        "
        "PictureBox1
        "
        Me.PictureBox1.Location = New System.Drawing.Point(88, 144)
        Me.PictureBox1.Name = "PictureBox1"
        Me.PictureBox1.Size = New System.Drawing.Size(104, 88)
        Me.PictureBox1.TabIndex = 1
        Me.PictureBox1.TabStop = False
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Controls.Add(Me.PictureBox1)
        Me.Controls.Add(Me.Button1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)
    End Sub
#End Region
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If OpenFileDialog1.ShowDialog() = DialogResult.OK Then
            PictureBox1.Image = Image.FromFile(OpenFileDialog1.FileName)
        End If
    End Sub
    Private Sub OpenFileDialog1_FileOk(ByVal sender As System.Object, ByVal e As System.ruponentModel.CancelEventArgs) Handles OpenFileDialog1.FileOk
    End Sub
End Class