The question, as stated, cannot be answered sensibly. A millilitre is a measure of volume, with dimensions [L3]. A milligram is a measure of mass, with dimensions [M]. The two measure different things and elementary dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
As a simple mental exercise consider a millilitre of air and of water. They will have very different masses.
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Does not convert; milligrams (mg) and grams are measures of weight or mass and mL (milliliters) is a measure of volume.
There are 1000 milligrams in one gram. Therefore, 100 milligrams is equal to 100/1000 = 0.1 grams.
You have 1000 micrograms in a milligram. Therefore you have to divide by 1000 here. 100/1000 is 0.1 milligram.
There are 1000 micrograms in one milligram. Therefore, 100 micrograms is equal to 100/1000 = 0.1 milligrams.
This is not a valid comparison; milligrams (mg) is a measure of weight or mass while milliliters (mL or ml) measure volume.