In ASP.NET, you can reference VB functions in your code-behind files or inline code using the <%@ Page %> directive or by defining functions directly in your code-behind file.
Here's a simple explanation with examples:
Using Code-Behind Files:
Let's say you have a VB function defined in your code-behind file (e.g., MyPage.aspx.vb):
Example
Public Class MyPage
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
' Your code here
End Sub
Public Function AddNumbers(ByVal num1 As Integer, ByVal num2 As Integer) As Integer
Return num1 + num2
End Function
End Class
In your ASPX file (MyPage.aspx), you can call this function like this:
Example
<%@ Page Language="VB" AutoEventWireup="true" CodeFile="MyPage.aspx.vb" Inherits="MyPage" %>
<html>
<head>
<title>My Page</title>
</head>
<body>
<%
Dim result As Integer = AddNumbers(5, 3)
Response.Write("Result: " & result)
%>
</body>
</html>
This code will output "Result: 8" because it's calling the AddNumbers function defined in the code-behind file.
Using Directives:
You can also use the <%@ Page %> directive in your ASPX file to reference external VB functions:
Example
<%@ Page Language="VB" AutoEventWireup="true" CodeFile="MyPage.aspx.vb" Inherits="MyPage" %>
<%@ Import Namespace="NamespaceContainingVBFunctions" %>
<html>
<head>
<title>My Page</title>
</head>
<body>
<%
Dim result As Integer = MyExternalFunction(5, 3) ' Assuming MyExternalFunction is defined in NamespaceContainingVBFunctions
Response.Write("Result: " & result)
%>
</body>
</html>
Ensure that the namespace containing your VB functions is properly imported using the <%@ Import %> directive.
These are the basic ways you can reference VB functions in ASP.NET, either by defining them in your code-behind files or by importing them using directives.