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OpenFileDialog.Multiselect Property

Gets or sets a value indicating whether the dialog box allows multiple files to be selected.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public bool Multiselect { get; set; }
/** @property */
public boolean get_Multiselect ()

/** @property */
public void set_Multiselect (boolean value)

public function get Multiselect () : boolean

public function set Multiselect (value : boolean)

Property Value

true if the dialog box allows multiple files to be selected together or concurrently; otherwise, false. The default value is false.

Use the FileNames property to access the full list of selected file names.

The following code example demonstrates initializing an OpenFileDialog, setting the Title and Filter properties, and allowing the user to select multiple files by setting the Multiselect property to true. To run this example paste the following code in a form containing an OpenFileDialog named OpenFileDialog1 and a Button named fileButton. Call the InitializeOpenFileDialog method in the form's constructor or Load method. The example also requires that the Click event of the Button control is connected to the event handler defined in the example.

private void InitializeOpenFileDialog()
{
    this.OpenFileDialog1 = new System.Windows.Forms.OpenFileDialog();

    // Set the file dialog to filter for graphics files.
    this.OpenFileDialog1.Filter = 
        "Images (*.BMP;*.JPG;*.GIF)|*.BMP;*.JPG;*.GIF|" + 
        "All files (*.*)|*.*";

    // Allow the user to select multiple images.
    this.OpenFileDialog1.Multiselect = true;
    this.OpenFileDialog1.Title = "My Image Browser";
    
}

private void fileButton_Click(System.Object sender, System.EventArgs e)
{
    OpenFileDialog1.ShowDialog();
}


private void InitializeOpenFileDialog()
{
    this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
    // Set the file dialog to filter for graphics files.
    this.openFileDialog1.set_Filter("Images (*.BMP;*.JPG;*.GIF)|" 
        + "*.BMP;*.JPG;*.GIF|All files (*.*)|*.*");
    // Allow the user to select multiple images.
    this.openFileDialog1.set_Multiselect(true);
    this.openFileDialog1.set_Title("My Image Browser");
} //InitializeOpenFileDialog

private void fileButton_Click(Object sender, System.EventArgs e)
{
    openFileDialog1.ShowDialog();
} //fileButton_Click

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

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