C＃白色或黑色不需要的像素出现在图像中

I am new to C#, I am using Visual Studo 2010, I have an image that needs to be displayed on a picturebox. I tried many different methods. All the methods results in some unwanted pixels to appear along with image. I have tried picturebox.Image = Image.FromFile("bird.png");I am new to C#, I am using Visual Studo 2010, I