.NET / Windows Forms: remember windows size and location

I tried a few different methods; this is what ended up working for me. (In this case - on first launch - the defaults haven't been persisted yet, so the form will use the values set in the designer)

1. Add the settings to the project (manually - don't rely on visual studio):

2. Add the following code to your form:

   private void Form1_Load(object sender, EventArgs e)
   {
       this.RestoreWindowPosition();
   }
   
   private void Form1_FormClosing(object sender, FormClosingEventArgs e)
   {
       this.SaveWindowPosition();
   }
   
   private void RestoreWindowPosition()
   {
       if (Settings.Default.HasSetDefaults)
       {
           this.WindowState = Settings.Default.WindowState;
           this.Location = Settings.Default.Location;
           this.Size = Settings.Default.Size;
       }
   }
   
   private void SaveWindowPosition()
   {
       Settings.Default.WindowState = this.WindowState;
   
       if (this.WindowState == FormWindowState.Normal)
       {
           Settings.Default.Location = this.Location;
           Settings.Default.Size = this.Size;
       }
       else
       {
           Settings.Default.Location = this.RestoreBounds.Location;
           Settings.Default.Size = this.RestoreBounds.Size;
       }
   
       Settings.Default.HasSetDefaults = true;
   
       Settings.Default.Save();
   }
   

You'll need to save the window location and size in your application settings. Here's a good C# article to show you how.

EDIT

You can save pretty much anything you want in the application settings. In the Type column of the settings grid you can browse to any .NET type. WindowState is in System.Windows.Forms and is listed as FormWindowState. There's also a property for FormStartPosition.

If you add this code to your FormClosing event handler:

if (WindowState == FormWindowState.Maximized)
{
    Properties.Settings.Default.Location = RestoreBounds.Location;
    Properties.Settings.Default.Size = RestoreBounds.Size;
    Properties.Settings.Default.Maximised = true;
    Properties.Settings.Default.Minimised = false;
}
else if (WindowState == FormWindowState.Normal)
{
    Properties.Settings.Default.Location = Location;
    Properties.Settings.Default.Size = Size;
    Properties.Settings.Default.Maximised = false;
    Properties.Settings.Default.Minimised = false;
}
else
{
    Properties.Settings.Default.Location = RestoreBounds.Location;
    Properties.Settings.Default.Size = RestoreBounds.Size;
    Properties.Settings.Default.Maximised = false;
    Properties.Settings.Default.Minimised = true;
}
Properties.Settings.Default.Save();

It will save the current state.

Then add this code to your form's OnLoad handler:

if (Properties.Settings.Default.Maximised)
{
    Location = Properties.Settings.Default.Location;
    WindowState = FormWindowState.Maximized;
    Size = Properties.Settings.Default.Size;
}
else if (Properties.Settings.Default.Minimised)
{
    Location = Properties.Settings.Default.Location;
    WindowState = FormWindowState.Minimized;
    Size = Properties.Settings.Default.Size;
}
else
{
    Location = Properties.Settings.Default.Location;
    Size = Properties.Settings.Default.Size;
}

It will restore the last state.

It even remembers which monitor in a multi monitor set up the application was maximised to.