Pass (Send) parameter to mock method using moq framework in ASP.Net

How to pass second parameter in mock setup method in list

dbConn.Setup(x => x.ExecuteDataAdapter("sp", It.IsAny<List<DBParam>>())).Returns(ds);

I’m mock the above method and my return type as dataset (ds).

But getting null return why?

dbConn.Setup(x => x.ExecuteDataAdapter("SP", "param">())).Returns(ds); 

Here I’m passing two parameter as string getting return as dataset correctly