Hi Every one Thanks in advance 
i can able to save mulitiselect values to Db
but how to show in front screen multiselected values in dropdownlist
please any one help me
<?php echo $form->dropDownList($model,'AllocationDepartment',CHtml::listData($Dept,'Department_Code','Department'),array('multiple'=>'true','prompt'=>'select ','selected'=>'selected'));
How you store selected values in database?
I found it working for me by below way:
let consider dropdown in view
$days = array(
'Sun'=>'Sunday',
'Mon'=>'Monday',
'Tue'=>'Tuesday',
'Wed'=>'Wednesday',
'Thu'=>'Thursday',
'Fri'=>'Friday',
'Sat'=>'Saturday',
);
if(isset($model->id) && !empty($model->id))
{
$model->working_days = explode('-', $model->working_days);
}
echo $form->dropDownList($model, ‘working_days’, $days, array(‘multiple’=>true,‘selected’=>‘selected’));
add beforeSave method in model class
public function beforeSave() {
// converting array to string
if(!empty($this->working_days))
{
$this->working_days = implode("-", $this->working_days);
}
return parent::beforeSave();
}