True allergies to cow's milk are relatively uncommon. Only 2 to 3 percent of children are allergic to milk, according to the AAP, and almost all of them outgrow it by age 3. (Learn the difference between a milk allergy and lactose intolerance .).
The underscore [ _ ] (also called underline, underbar, low line, or low dash) is a character that originally appeared on the typewriter and was primarily used to underline words.
To use variables in your C# programs, you must know how to create variable names. In C#, variable names must adhere to the following rules: The name can contain letters, digits, and the underscore character (_). The first character of the name must be a letter.