How do I change this code to fade in an image?

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C#

WinForms

C#4.0

graphics

Hey, I've tried using both this batch of code and another batch of code for fading images in and out. Both manage to successfully fade the image out, but I cannot get the second image to fade back in. I believe this has to do with both batches drawing rectangles over the image of either lesser and lesser opacity or greater and greater opacity.

I've tried both of those codes within nested if statements that determine whether the image present fades out and when to bring the new image in to start fading it up.
If anyone could point me in the proper direction for changing the opacity of the image back up that would be greatly appreciated.

Here's my code for refrence:

private void timer1_Tick(object sender, EventArgs e)
        {
           
            //Runs checks to determine if first image should fade out.
            if (imageChange == true)
            {
                if (breakCheck2 == false)
                {

                    //fades out the image.
                    if (alpha++ < 40)
                    {
                        Image image = pictureBox1.Image;
                        using (Graphics g = Graphics.FromImage(image))
                        {
                            Pen pen = new Pen(Color.FromArgb(alpha, 255, 255, 255), image.Width);
                            g.DrawRectangle(pen, -1, -1, image.Width, image.Height);
                            g.Save();

                        }
                        pictureBox1.Image = image;
                        if (alpha == 40)
                        {
                            breakCheck = true;
                        }
                    }
                }
            }
            
            //runs check to see if second image should fade up.
            if (breakCheck == true)
            {
                if (alpha-- > 0 )
                {
                    //grads second image when applicable.
                    if (imageChange == true)
                    {
                        pictureBox1.Image = Properties.Resources.transitionTest;
                        pictureBox1.Invalidate();
                        imageChange = false;
                    }
                    
                    //Should fade in second image, but instead fades it out.
                    Image image = pictureBox1.Image;
           

                    float opacityvalue = opacity = +.5F;
                    pictureBox1.Image = ChangeOpacity(image, opacityvalue);
                    
                   
                    
                }
                if (alpha == 0)
                {
                    breakCheck = false;
                    breakCheck2 = false;
                    imageChange = true;
                    opacity = 0;
                    timer1.Stop();
                }
               
            }