return arrayData in xml format

I am developing a webservice. In one web method,  i will have two string arrays and I want to return this two string arrays with Object. How can i do it? is ther any other easy solution to do like with the concept of serialization...

Here is my web service method.

 public Object[] projects(string MangerName, string id)

       {

            string[] projectName = new string[1];

            projectName[0] = "ProjectName";

            projectName[1] = "ProjectShortName";       

            // Here is the logic to fill projectName array with "ProjectName" and "ProjectShortName"

            Object[] AllProject = new Object[projectName.Count()];

            AllProject = projectName;

            return AllProject;

        }
Thanks in advance

Darma