StackOverflowException in asp.net

Hi Experts,
I have a function which is throwing StackOverflowException.

t thorws message,
StackOverflowException was unhandled.
An unhandled exception of type 'System.StackOverflowException' occurred in mscorlib.dll

 public DataTable Recurssive(string NewWduserId, string WduserId, DataTable currentTeam, DataTable dtFinal, int HierachyId)
        {
            DataRow[] currentTeam1 = currentTeam.Select("WduserId = '" + WduserId + "'");
            string TM = string.Empty;
            if (currentTeam1.Length > 0)
            {
                if (WduserId.Trim() != Convert.ToString(currentTeam1[0]["SuperVisor"]).Trim())
                {
                    DataRow[] dr = currentTeam.Select("Supervisor ='" + Convert.ToString(currentTeam1[0]["SuperVisor"]) + "'");
                    if (dr.Length > 0)
                    {
                        DataRow drn = dtFinal.NewRow();
                        DataRow[] drWd = currentTeam.Select("WduserId = '" + NewWduserId + "'");
                        drn["wduserid"] = NewWduserId;
                        drn["empname"] = drWd[0]["empname"];
                        drn["supervisorid"] = dr[0]["supervisor"];
                        drn["supervisorname"] = dr[0]["supervisorname"];
                        drn["designation"] = dr[0]["designationname"];
                        drn["compemailId"] = dr[0]["compemailId"];
                        drn["StructureId"] = HierachyId;
                        dtFinal.Rows.Add(drn);
                        HierachyId = HierachyId + 1;
                        Recurssive(NewWduserId, dr[0]["SuperVisor"].ToString(), currentTeam, dtFinal, HierachyId);
                    }
                }
            }
            return dtFinal;
        }


What's wrong going on?