fixed the C# code :

SqlCommand cmd = new SqlCommand("casp_GetExist", cnt);

SqlParameter parameter = new SqlParameter();

cmd.CommandType = CommandType.StoredProcedure;

//The parameter for the SP must be of SqlDbType.Structured

parameter.ParameterName = "@BLMJ_LIST";

parameter.TypeName = "CampaignIdList";

parameter.SqlDbType = System.Data.SqlDbType.Structured;

parameter.Value = dataTable;

cmd.Parameters.Add(parameter);

SqlDataReader sqlDR = cmd.ExecuteReader();

but dont get recordset on :sqlDR