Microsoft.VisualStudio.Project.DocumentManager.CloseWindowFrame C# (CSharp) Method

        protected static void CloseWindowFrame(ref IVsWindowFrame windowFrame)
        {
            if(windowFrame != null)
            {
                try
                {
                    ErrorHandler.ThrowOnFailure(windowFrame.CloseFrame(0));
                }
                finally
                {
                    windowFrame = null;
                }
            }
        }