To start creating a script in the head section, starts a <script> tag and close with an end </script> tag. Here is an example: <%@ Page Language="C#" %> <html> <head> <script> </script> <title>Exercise</title> </head> <body> </body> </html> The <script> tag uses various attributes. To start, you must specify that the script will run on the server. To do this, add an attribute named runat to the tag and assign the server string to it. This can be done as follows: <%@ Page Language="C#" %> <html> <head> <script runat="server"> </script> <title>Exercise</title> </head> <body> </body> </html> After doing this, you can create your code between the starting <script> and the end </script> tags. When writing your code, because you have determined that the page will use the C# language, you can simply write your code as you see fit. Still, you have the option of choosing among various languages. The available languages are C#, VB, VBSscript, JavaScript, JScript, or ECMAScript. To let you specify the language, the <script> tag is equipped with an attribute named language. To specify the language, assign it to the language attribute. Here is an example: <%@ Page Language="C#" %> <html> <head> <script language="C#" runat="server"> </script> <title>Exercise</title> </head> <body> </body> </html> If you don't specify the language, C# is assumed. Besides the language, you can specify how the code of your script will be formatted or considered. To support this, the <script> tag is equipped with the type attribute. To specify it, assign:
Here is an example: <%@ Page Language="C#" %> <html> <head> <script language="C#" type="text/C#" runat="server"> </script> <title>Exercise</title> </head> <body> </body> </html> Remember that only the runat attribute is required. The others are optional. After specifying the values of the desired attributes, you can create your code.
You can divide your code is smaller or relatively smaller sections of code so that each section is meant to perform a specify task. Other sections of the program can then refer to that section for whatever it has to provide. Such a section of code is called a function. To create a function, there are some rules you must follow. The fundamental formula is: ReturnType FunctionName() { }
The first rule is that the function must be created outside of any other function. The ReturnType is the kind of value that the function will produce. Some functions don't produce a (specific) result. In this case, the ReturnType can be substituted with the void keyword. Like a variable, a function must have a name. The name follows the rules we have applied to variables so far. The name of a function must be followed by parentheses. The parentheses of a function must be followed by an opening curly bracket "{" and a closing curly bracket "}". The section inside of the curly brackets is referred to as the body of the function. In this body, you perform the assignment of the function. For example, a function can be used to simply display a sentence. Here is an example: <%@ Page Language="C#" %>
<html>
<head>
<script runat="server">
void Welcome()
{
Response.Write("Welcome to our web site.");
}
</script>
<title>Exercise</title>
</head>
<body>
</body>
</html>
Writing a function like this, with its name and body, is referred to as defining or implementing it. In the same way, you can define or implement as many functions as you judge necessary.
After creating a function, you can use it either inside of itself or from another function. Using a function is referred to as calling it. To call a function, type its name, followed by parentheses. If the function is called as a statement, then it must be terminated with a semi-colon. Here is an example: <%@ Page Language="C#" %>
<html>
<head>
<script runat="server">
void Welcome()
{
Response.Write("Welcome to our web site.");
}
</script>
<title>Exercise</title>
</head>
<body>
<%
Welcome();
%>
</body>
</html>
This would produce:
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