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Create an ArrayList
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Functions are like subprograms, except they talk back -- they return a data value to the calling statement and functions can be passed arguments, if needed, or they can operate without information being fed to them
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Function Formats
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The general format for a function is given below.
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Function name (argument As type [, argument As type]...) [As type]
...statements
[Return value]
[Exit Function]
End Function
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The following example shows a function named Get_Area which calculates the area of a rectangle and when supplied with height and width dimensions by the calling statement.
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<SCRIPT runat="server">
Sub Rectangle
Dim Width As Integer = 10
Dim Height As Integer = 5
Dim Area As Integer
Area = Get_Area(Width, Height)
End Sub
Function Get_Area (Width As Integer, Height As Integer) As Integer
Get_Area = Width * Height
Exit Function
End Function
</SCRIPT>
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Calling Functions from ASP.NET Pages
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Very often rather than from a subprogram,a function is called from a server control coded on the page.
During data binding,this routinely happens.
A simple example is shown below where the current date is embedded on the page when it loads and the date is supplied by a function call.
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<SCRIPT runat="server">
Sub Page_Load
Page.DataBind()
End Sub
Function Get_Date() As String
Get_Date = FormatDateTime(DateString, DateFormat.LongDate)
End Function
</SCRIPT>
<b>Today's date is <%# Get_Date %></b>
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The binding expression <%# Get_Date %> is a
call to the function, whose returned value replaces the call when
Page.DataBind() is executed in the
Page_Load procedure and similar function calls are
made when binding calculated data to <asp:Repeater>,
<asp:DataGrid>, and <asp:DataList>
controls.
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