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home / developersection / forums / how-to debug a vb.net webmethod?
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How-to debug a VB.NET WebMethod?

Anonymous User 3341 26 Aug 2014

I have an ASP.NET C# project consuming webservices and WebMethods are wrote in VB.NET with source code on a local IIS server. The WebMethod returns null, and I want to debug it to know why I get this.

As you may know, if I set a breakpoint just before the webmethod call, I cant step into this webmethod.

So, how is the correct way to debug this webmethod?

Thank you!

vb.net vb.net
Updated 06 Jul 2023
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2 Answers

Aryan Kumar
Aryan Kumar 06 Jul 2023
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Sure, I can help you with that. Here are the steps on how to debug a VB.NET WebMethod:

  1. Create a new ASP.NET Web Forms project.
  2. Add a WebMethod to the project.
  3. In the code behind file, add the following code:

VB.Net

Public Function HelloWorld() As String
    Return "Hello, World!"
End Function
  1. Run the project.
  2. In the Visual Studio debugger, set a breakpoint on the line of code that you want to debug.
  3. Click the Start Debugging button.
  4. The debugger will stop at the breakpoint.
  5. You can now step through the code line by line and inspect the values of variables.

Here is an explanation of the code:

  • The WebMethod attribute is used to mark a method as a WebMethod.
  • The HelloWorld method is a WebMethod that returns the string "Hello, World!".
  • The Set a breakpoint command is used to set a breakpoint on a line of code.
  • The Start Debugging button is used to start the debugger.
  • The Step through command is used to step through the code line by line.
  • The Inspect the values of variables command is used to inspect the values of variables.
Sumit Kesarwani
Sumit Kesarwani 26 Aug 2014
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Hi jay, 

Attach the debugger to the server process, put a breakpoint in the web method code and invoke the web method.

Visual Studio should break within the web method.

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