How to Set MultiValue Parameters with ​Reporting​Service​Execution

I need to send a multivalue parameter, any ideas?? this is the code that I actually have,


the full post is here
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=470509&SiteID=1

StringBuilder selectected = new StringBuilder();

int TiposCompetenciasSeleccionadas = 0;

ArrayList al = new ArrayList();

for (int i = 0; i < CheckBoxList1.Items.Count; i++)

if (CheckBoxList1.Items.Selected)

selectected.Append(",");

ParameterValue[] parametros = new ParameterValue[2 + TiposCompetenciasSeleccionadas] { pNmEmpresa, pNmCiclo };

for (int i = 0; i < parametros.Length; i++)

parametros[i+2].Name ="NmTipoCompetencia";

string[] nmtiposcompetencia = selectected.ToString().Split(new char[] { ',' });

rs.SetExecutionParameters(parametros, null);