Right click on the test project and select Add > Web Test…
IE will be opened with the Web Test Recorder available on the left side.
Click the stop button.
If you include the full path to the web method under test, the web method query variable will be extracted and created for you.
Assemble the soap request (I suggest using Internet Explorer to browse the web service and capture a sample soap request.
Drill down into the web request to fill out the String Body properties.
Set the content type to text/XML.
Click the ellipses button on the string body.
Paste the soap request into the popup – make sure and modify the placeholders with actual values.