How do I make my child Form fill the entire mdi client without being maximized?

Here is how it can be done. This takes into account all docked controls (including menus) in the mdi parent form.

[C#]
		private void FillActiveChildFormToClient()
		{
			Form child = this.ActiveMdiChild;
			Rectangle mdiClientArea = Rectangle.Empty;
			foreach(Control c in this.Controls)
			{
				if(c is MdiClient)
					mdiClientArea = c.ClientRectangle;
			}
			child.Bounds = mdiClientArea;
		}

[VB.Net]
		Private  Sub FillActiveChildFormToClient()
			Dim child As Form =  Me.ActiveMdiChild 
			Dim mdiClientArea As Rectangle =  Rectangle.Empty 
			Dim c As Control
			For Each c In Me.Controls
				If TypeOf c Is MdiClient Then
					mdiClientArea = c.ClientRectangle
				End If
			Next
			child.Bounds = mdiClientArea
		End Sub