Application settings in VB.NET 2.0 and Visual Studio 2005

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Introduction

A new feature of .NET 2.0 and Visual Studio 2005 is the ability to save a user's application settings in a user.config file that is saved in the user's desktop profile.

Background

Until .NET 2.0, it was difficult to save a user's settings for an application. User settings had to be saved in the registry, in an .ini file, or in a custom text file. Now, it is possible to save settings for a user's application that will even move with them in a roaming desktop profile.

To view the non-roaming settings, open the user.config file located at %USERPROFILE%\Local Settings\Application Data\<Company Name>\<appdomainname>_<eid>_<hash>\<verison>\user.config.

To view the roaming user settings, open the user.config file located at %USERPROFILE%\Application Data\<Company Name>\<appdomainname>_<eid>_<hash>\<verison>\user.config.

Using the code

To add application or user settings to a project, right-click on the project name in the Solution Explorer window, and click Properties. Then, click on Settings in the left tab list.

When a setting is added to the Visual Studio designer, a public property is created in the My.Settings namespace. Depending on the scope of the setting, the property will be ReadOnly or writable. This allows you to programmatically change the user setting values and save them with the My.Settings.Save() method.

A second way to save settings is to enable the 'Save My.Settings on Shutdown' setting in the application. To do this, right-click on the project name in the Solution Explorer window, and click Properties. Then, click on Application in the left tab list.

To restore the last saved dimensions of a form, we set the size and location of the form from the user settings in the form's Load event.

Private Sub Form1_Load _
    (ByVal sender As Object, ByVal e As System.EventArgs) _
    Handles Me.Load
        'Set textboxes and form name from application and user settings

        'Notice how the application setting property is ReadOnly
        Me.Text = My.Settings.MainFormText

        'Notice how the user settings are writable
        Me.Size = My.Settings.MainFormSize
        Me.Location = My.Settings.MainFormLocation

        Me.txtFormText.Text = My.Settings.MainFormText

        'Show the form now
        Me.Visible = True
    End Sub

In the form's FormClosing event, we save the form's size and location values to the current values.

Private Sub Form1_FormClosing _
    (ByVal sender As Object, _
    ByVal e As System.Windows.Forms.FormClosingEventArgs) _
    Handles Me.FormClosing
        Try
            'Set my user settings MainFormSize to the
            'current(Form) 's size
            My.Settings.MainFormSize = Me.Size

            'Set my user setting MainFormLocation to
            'the current form's location
            My.Settings.MainFormLocation = Me.Location

            'Save the user settings so next time the
            'window will be the same size and location
            My.Settings.Save()

            MsgBox("Your settings were saved successfully.", _
            MsgBoxStyle.OkOnly, "Save...")
        Catch ex As Exception
            MsgBox("There was a problem saving your settings.", _
            MsgBoxStyle.Critical, "Save Error...")
        End Try
    End Sub

Conclusion

You can use application and user settings for many things in .NET 2.0. Just remember that if you want to change the settings then the scope has to be set as User.

History

• Second revision - Moved around text and image to make the article more readable. Added a Conclusion section.
• Third revision - Updated user.config file paths, and added profile and auto save on exit explanation.

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