Unable to call SOAP webservices from VBCS

Summary:

We have a requirement of calling a SOAP service from VBCS. We tried to implement the steps given in the below link but could not implement it.

Is there any other reference documentation for the same ?

Content (required):

CAlling SOAP webservices on a button click in vbcs

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):