The System.Web.UI.WebControls.UnitType enumeration represents the different supported measurement units. Measurements can be represented in pixels, points, picas, inches, millimeters, centimeters, percentages, em, or ex.
A UnitType.Point is a unit of measurement that represents 1/72 of an inch.
A UnitType.Pica is a unit that equals 12 points.
A UnitType.Percentage is a unit of measurement that is relative to a parent element. For example, if the font size of a paragraph is 10 pixels, you can place a phrase inside the paragraph with a font size specified as 200%. The font size of the phrase becomes twice the font size of the paragraph, or 20 pixels.
An UnitType.Em is a unit of measurement that is relative to the height of a parent element's font. For example, if the font size of a paragraph is 10 pixels, you can place a phrase inside the paragraph with a font size specified as 2 em. The font size of the phrase becomes twice the font size of the paragraph, or 20 pixels.
An UnitType.Ex is a unit of measurement that is relative to the height of the lowercase letter x of the parent element's font. For example if the font size of a paragraph is 10 pixels, you can place a phrase inside the paragraph with a font size specified as 2 ex. The font size of the phrase becomes twice the font size of a lowercase letter x in the paragraph.