Summary of commonly used functions in asp.net

Abs(number) Get the absolute value of the value.
Asc(String) Get the ASCII code of the first character of stringexpression.
Atn(number) Get the arctangent value of an angle.
CallByName (object, procname, usecalltype,[args()]) Execute an object's method, set or return the object's attributes.
CBool(expression) Convert expression to Boolean type.
CByte(expression) Convert expression to Byte type.
CChar(expression) Convert expression to character type.
CDate(expression) Convert expression to Date type.
CDbl(expression) Convert expression to Double type.
CDec(expression) Convert expression to Decimal type.
CInt(expression) Convert expression to Integer type.
CLng(expression) Convert expression to Long type.
CObj(expression) Convert expression to Object type.
CShort(expression) Convert expression to Short type.
CSng(expression) Convert expression to Single type.
CStr(expression) Convert expression to String type.
Choose (index, choice-1[, choice-2, ... [, choice-n]]) Use the index value to select and return the set parameters.
Chr(charcode) Get the character content in ASCII code.
Close(filenumberlist) End the file opened using Open.
Cos(number) Get the cosine value of an angle.
Ctype(expression, typename) Convert the type of expression.
DateAdd(dateinterval, number, datetime) Add and subtract dates or times.
DateDiff(dateinterval, date1, date2) Calculate the difference between two dates or times.
DatePart (dateinterval, date) Returns the year, month, day or time according to the received date or time parameter.
DateSerial(year, month, day) Combine the received parameters into a Date type data with only date.
DateValue(datetime) Get the date value that conforms to the country setting style and includes the time.
Day(datetime) Returns the day based on the received date parameter.
Eof(filenumber) Returns True when the end of an opened file is reached.
Exp(number) Returns the power value of e according to the received parameters.
FileDateTime(pathname) Returns the date and time when the file was created.
FileLen(pathname) Returns the length of the file, the unit is Byte.
Filter(sourcearray, match[, include[, compare]]) Search for the specified string in the string array. If the array element contains the specified string, it will be They are combined into a new string array and passed back. If you want to return array elements that do not contain the specified string, set the include parameter to False. The compare parameter is to set whether the search is case-sensitive. In this case, just give TextCompare a constant or 1.
Fix(number) Remove the decimal part of the parameter and return it.
Format(expression[, style[, firstdayofweek[, firstweekofyear]]]) Convert date, time and numerical data into a format acceptable to each country.
FormatCurrency(expression[,numdigitsafterdecimal [,includeleadingdigit]]) Output the numerical value as amount type. The numdigitsafterdecimal parameter is a decimal number, and the includingleadingdigit parameter is whether to complement the integer number when integer is 0.
FormatDateTime(date[,namedformat]) Returns formatted date or time data.
FormatNumber(expression[,numdigitsafterdecimal [,includeleadingdigit]]) Returns formatted numerical data. The Numdigitsafterdecimal parameter is the decimal number, and the includingleadingdigit parameter is whether to complement the integer number when the integer is 0.
FormatPercent(expression[,numdigitsafterdecimal [,includeleadingdigit]]) Returns the numerical data converted to percentage format. The numdigitsafterdecimal parameter is the decimal number, and the includingleadingdigit parameter is whether to complement the integer number when the integer is 0.
GetAttr(filename) Returns the attribute value of the file or directory.
Hex(number) Convert numeric parameters to hexadecimal values.
Hour(time) Returns the hour field of the time, the type is Integer.
Iif(expression, truepart, falsepart) When the return value of the expression is True, execute the program of the truepart field, otherwise execute the program of the falsepart field.
InStr([start, ]string1, string2) Search at which character of the string the character set by the string2 parameter appears. start is the character from which to start searching. string1 is the character to be searched. string, string2 is the character to be searched.
Int(number) Returns the maximum integer value that is less than or equal to the received parameter.
IsArray(varname) Determines whether a variable is an array type. If it is an array, True is returned, otherwise False.
IsDate(expression) Determines whether the expression content is of DateTime type. If so, it returns True, otherwise it returns False.
IsDbNull(expression) Determines whether the expression content is Null. If so, it returns True, otherwise it returns False.
IsNumeric(expression) Determines whether the expression content is a numeric type. If so, it returns True, otherwise it returns False.
Join(sourcearray[, delimiter]) Combine the string array with only one string. The delimiter parameter is set to add a new string between each element.
Lcase(string) Convert the string to lowercase font.
Left(string, length) Get the characters with the length set by the length parameter starting from the left side of the string.
Len(string) Get the length of the string.
Log(number) Get the natural logarithm of the value.
Ltrim(string) Remove the left blank part of the string.
Mid(string, start[, length]) Get the string length length after the characters set by the strat parameter in the string. If the length parameter is not set, get all the characters after start. character.
Minute(time) Get the part of the time content, the type is Integer.
MkDir(path) Create a new directory.
Month(date) Get the month part of the date, the type is Integer.
MonthName(month) Get the complete writing of the month based on the received month value.
Now() Get the current date and time.
Oct(number) Convert numeric parameters to octal values.
Replace(expression, find, replace) Convert the string specified by the find parameter in the string to the string specified by the replace parameter.
Right(string,length) Get the characters with the length set by the length parameter starting from the right side of the string.
RmDir(path) Remove an empty directory.
Rnd() Get a decimal between 0 and 1. If you want to get a different value every time, you need to add the Randomize description before use.
Rtrim(string) Remove the right blank part of the string.
Second(time) Get the second part of the time content, the type is Integer.
Sign(number) Gets whether the numerical content is a positive or negative number. Positive numbers return 1, negative numbers return -1, and 0 returns 0.
Sin(number) Get the sine value of an angle.
Space(number) Get the blank string set by the number parameter.
Split(expression[, delimiter]) Split the string into a string array based on the condition string set by the delimiter parameter.
Sqrt(number) Get the square root of a number.
Str(number) Convert the number to a string and return it.
StrReverse(expression) Get the result of inverting the string content.
Tan(number) Get the tangent value of a certain angle.
TimeOfDay() Get the current time that does not include a date.
Timer() Get the number of seconds from 0:00 to the current time, the type is Double.
TimeSerial(hour, minute, second) Combine the received parameters into a data with only time Date type.
TimaValue(time) Get the time value that conforms to the country setting style.
Today() Get today’s date excluding time.
Trim(string) Remove the blanks at the beginning and end of the string.
TypeName(varname) Get the type of variable or object.
Ubound(arrayname[, dimension]) Get the final index value of the array. The dimension parameter specifies which dimension to get the final index value.
Ucase(string) Convert a string to uppercase.
Val(string) Convert a string representing a number into a numerical type. If the string contains non-numeric content, it will be removed and merged into a number.
Weekday(date) The date in the parameter is the day of the week, Sunday is 1, Monday is 2, Tuesday is 3 and so on.
WeekDayName(number) Get the name of the week according to the received parameters. The acceptable parameters are 1 to 7, Sunday is 1, Monday is 2, Tuesday is 3 and so on.

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