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OpenFileDialog Class

Represents a common dialog box that displays the control that allows the user to open a file. This class cannot be inherited.

For a list of all members of this type, see OpenFileDialog Members.


[Visual Basic]
NotInheritable Public Class OpenFileDialog
   Inherits FileDialog
public sealed class OpenFileDialog : FileDialog
public __gc __sealed class OpenFileDialog : public FileDialog
public class OpenFileDialog extends FileDialog

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.


This class allows you to check whether a file exists and to open it. The ShowReadOnly property determines whether a read-only check box appears in the dialog box. The ReadOnlyChecked property indicates whether the read-only check box is checked.

Most of the functionality for this class is found in the FileDialog class.


[Visual Basic, C#, C++] The following example creates an OpenFileDialog, sets several properties, and displays the dialog box using the CommonDialog.ShowDialog method. The example assumes a form with a Button placed on it and the System.IO namespace added to it.

[Visual Basic] 
Protected Sub button1_Click(sender As Object, e As System.EventArgs)
    Dim myStream As Stream
    Dim openFileDialog1 As New OpenFileDialog()
    openFileDialog1.InitialDirectory = "c:\"
    openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*"
    openFileDialog1.FilterIndex = 2
    openFileDialog1.RestoreDirectory = True
    If openFileDialog1.ShowDialog() = DialogResult.OK Then
        myStream = openFileDialog1.OpenFile()
        If Not (myStream Is Nothing) Then
            ' Insert code to read the stream here.
        End If
    End If
End Sub

protected void button1_Click(object sender, System.EventArgs e)
    Stream myStream;
    OpenFileDialog openFileDialog1 = new OpenFileDialog();

    openFileDialog1.InitialDirectory = "c:\\" ;
    openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*" ;
    openFileDialog1.FilterIndex = 2 ;
    openFileDialog1.RestoreDirectory = true ;

    if(openFileDialog1.ShowDialog() == DialogResult.OK)
        if((myStream = openFileDialog1.OpenFile())!= null)
            // Insert code to read the stream here.

 void button1_Click(Object* /*sender*/, System::EventArgs* /*e*/)
     Stream* myStream;
     OpenFileDialog* openFileDialog1 = new OpenFileDialog();
     openFileDialog1->InitialDirectory = S"c:\\" ;
     openFileDialog1->Filter = S"txt files (*.txt)|*.txt|All files (*.*)|*.*" ;
     openFileDialog1->FilterIndex = 2 ;
     openFileDialog1->RestoreDirectory = true ;
     if(openFileDialog1->ShowDialog() == DialogResult::OK)
         if((myStream = openFileDialog1->OpenFile())!= 0)
             // Insert code to read the stream here.

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.


Namespace: System.Windows.Forms

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework

Assembly: System.Windows.Forms (in System.Windows.Forms.dll)

See Also

OpenFileDialog Members | System.Windows.Forms Namespace | FileDialog | CommonDialog