You can enter a numeric character prior to the tilde to denote how many alpha characters you want to change.
可以在波浪号前面输入一个数字，表示希望改变多少个字母字符的大小写。
Gets the decimal digit value of the numeric character at the specified index of the specified string.
获取位于指定字符串的指定索引位置的数值型字符的十进制数字值。
If a user enters, for example, a non-numeric character in a numeric-only field, the program would put up a clue box near the point of the offending entry, yet without obscuring it.
如果用户在纯数字字段中输入一个非数字字符，程序会在犯规输入的位置附近显示一个暗示框，但不会遮盖或者模糊掉所输入的数据。
If a user enters, for example, a non-numeric character in a numeric-only field, the program would put up a clue box near the point of the offending entry, yet without obscuring it.
如果用户在纯数字字段中输入一个非数字字符，程序会在犯规输入的位置附近显示一个暗示框，但不会遮盖或者模糊掉所输入的数据。
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