I had been functioning with DNN for a long time, Believed this weblog could help other DNN develops. There are two approaches to Contain WSDL files into a DNN module. Service Reference and Web Reference.
Right here I will discussing about Web References.

So to Contain them into DNN initial Correct Click On References within your Project Solution
References -> Add Service Reference -> Advanced(Left bottom Corner) -> Add Web Reference.

Paste your WSDL link towards the URL

Once you hit Add Reference button, Visual Studio will update the Web.config at the Module level.
But need to delete the Module Level Config files.
But Dont forget to take a backup of it, If anything goes wrong

And Set few parameters at Site level web.config file

Remember If you Creating DNN module package and your module uses any kind of SOAP services.
You ought to add parameters to Target Site’s Config file otherwise the site may not work.

Happy Coding