Hi,

I have used following line of code to save my image as a .png file on my hard-disk:
sampleImage.Save("C:\SampleDir\Sample.Png", Imaging.ImageFormat.Png)

I noticed another overload for Image saving where we just specify the file-name and not the format ie: i could do with the code as:
sampleImage.Save("C:\SampleDir\Sample.Png")

I wanted to know what is the difference between both the LOCs?
What is the default image format taken up with the latter LOC?

As always, read the documentation.

Image.Save Method (String) (System.Drawing)

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