ContributionsMost RecentMost LikesSolutionsRe: Null Value testing Thank you JHunt. I guess you might be correct. On trying all your suggestions, I always get an empty string in my C# code side. My C# library should to taking care of null as an empty string since the API parameter is a string. Re: Null Value testing Thank you JHunt. Guess you must be right. On trying all your suggestions always returns an empty string. So my C# library always returns an empty string since it's a string value in my API. Null Value testing I have 3 input parameter in SOPA project. I want to test what happens when a null value is passed to one of the string. Is there a way to pass a null string. <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:lib="foo.com"> <soapenv:Header/> <soapenv:Body> <lib:foo> <lib:fooA>?</lib:lib:fooA> <lib:lib:fooB>?</lib:lib:fooB> <!--Optional:--> <lib:lib:fooC>If I leave it as empty it's going as string.Empty in the code. I want the value to be null.</lib:lib:fooC> </lib:foo> </soapenv:Body> </soapenv:Envelope> Tried below method - Did not work. xsi:nil="true" C#code behind: [webmethod] public bool foo(String a, String b, String c) { If( c == null) I want this condition to be a success for the testing. } Thank you. SolvedRe: soapUI - how to pass null value and empty string in xml Were you able to find a solution to this problem statement?