To disable the particular value in rad combo box

 long SchemID = 0;
                int Status = 0;
                foreach (Schema obj in lstSchemas)
                {
                    SchemID = obj.SchemaID;
                    Status = obj.Status;
                    if (Status == 0)
                    {
                        RadComboBoxItemitem=drp_InsuranceCompScheme.FindItemByValue(SchemID.ToString());
                        item.Enabled = false;
                    }
                }