In Modern programming procedures are very useful.

• is a sequence of statements, enclosed by the Sub and End Sub statements

• perform an actions, but does not return a value

• can take arguments that are passed to it by a calling procedure

• without arguments, must include an empty set of parentheses ()

For creating the sub procedure, start the section of code with the Sub keyword followed by a name for the sub procedure. It must be followed by an opening and closing parentheses so that it differentiate the name of the sub procedure with any other regular name. Always close the section of the sub procedure with End Sub keyword

You can call procedure from another procedure, function, or control's event in the body section of an HTML file. To call a simple procedure such as the earlier DisplayFullName, you can just write the name of the sub procedure.

Following example shows the above DisplayFullName sub procedure is called when the user clicks the Detail section of the form:

 

Sometimes a procedure needs one or more values to work on for carrying an assignment then procedure needs a variable called argument. Another procedure might need more that one argument. The number and types of arguments of a procedure depends on different factors.

If you are writing your own procedure, on the basis of your requirement place arguments You also decide on the type of the argument(s). For a procedure that is taking one argument, in the parentheses of the procedure, write a name for the argument. Below is an example:
 

There are various ways you call a sub procedure. As we saw already, if a sub procedure doesn't take an argument, you just write its name. If a sub procedure is taking an argument, type the name of the sub procedure followed by the name of the argument. If the sub procedure is taking more than one argument, type the name of the procedure followed by the name of the argument, in the exact order they are passed to the sub procedure, separated by a comma. Below is an example:

One alternative,to call a sub procedure use the keyword Call.Now in this case, when calling a procedure using Call, you must include the argument(s) between the parentheses. using Call, the above procedure could call the CalcAndShowSalary as follows: