How do I pass in and out parameters to an Oracle Stored Procedure from an ASP.NET web application using the VB.net language.

I have create a Oracle stored procedure that check to see if a record exist and then returns an integer 0 or 1.  I need to call and pass parameters to ths store procedure from a public Function ASP.net.  Here is the Error message that I am getting returned in the ASP.net debugger:  Message = "ORA-06550: line 1, column 7: PLS-00306: wrong number or types of arguments in call to 'RECORDEXISTS' ORA-06550: line 1, column 7: PL/SQL: Statement ignored ".  Here is my Oracle stored procedure code:

PROCEDURE recordExists(i_domain          VARCHAR2 ,
                          i_status          VARCHAR2,
                          i_sdtm_ig_version VARCHAR2,
                          recordExists  OUT NUMBER)
   AS
   BEGIN
      SELECT count(*) INTO recordExists
         FROM vw_mapping_domain_ref_all
            WHERE upper(domain) = upper(i_domain) AND
                  upper(status) = upper(i_status) AND
                  sdtm_ig_version = i_sdtm_ig_version;

   END recordExists;

Here is my ASP.net Code:

Public Sub draftrecordExists(ByVal dom As domainRefDetails)
        Dim ora As New OracleDataAccess(connectionString)
        Dim myParams As OracleParameter()
        myParams = ora.InitParameters(3)

        myParams(0) = OracleDataAccess.CreateInputParameter("i_domain", dom.domain, OracleType.NVarChar)
        myParams(1) = OracleDataAccess.CreateInputParameter("i_status", dom.status, OracleType.NVarChar)
        myParams(2) = OracleDataAccess.CreateInputParameter("i_sdtm_ig_version", dom.sdtm_ig_version, OracleType.NVarChar)
        myParams(3) = OracleDataAccess.CreateOutputParameter("o_recordExistts", OracleType.Int16)

        Try
            ora.ExecuteStoredProc("pkg_vw_mapping_domain_ref.RecordExists", myParams)

        Catch ex As OracleException

        End Try
    End Sub

Here is the code that calls the procedure:

mynum = checkforexistrecord(DATAKEY1, DATAKEY2, DATAKEY3)