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c# - Reading a PNG image file in .Net 2.0

I'm using C# in .Net 2.0, and I want to read in a PNG image file and check for the first row and first column that has non-transparent pixels.

What assembly and/or class should I use?

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Bitmap class from System.Drawing.dll assembly:

Bitmap bitmap = new Bitmap(@"C:image.png");
Color clr = bitmap.GetPixel(0, 0);

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