Validation in yii

hello, i am learning yii so need help regarding form validation. I am not using form with yii that is using just simple HTML in view here it is,


<form id="form-login" name="admin-login" action="<?php echo Yii::app()->getBaseUrl().'/webmanager/webmanager/login'; ?>" method="POST">                

            <h3>Login to your account </h3>

                <hr/>

                <?php if(Yii::app()->user->hasFlash('error'))

                {

                ?>

                <div class="alert alert-danger">

                    <strong>Error!</strong> <?php echo Yii::app()->user->getFlash('error'); ?>

                </div>

                <?php } 

                ?>

                <div class="form-group">

                    <div class="controls">

                        <input type="text" placeholder="Username" class="form-control" name="admin_username" id="admin_username" />

                    </div>

                    <?php echo $form->error($model,'admin_username'); ?> 

                </div>

                <div class="form-group">

                    <div class="controls">

                        <input type="password" placeholder="Password" class="form-control" name="admin_password" id="admin_password" />

                    </div>

                </div>

                <div class="form-group">

                    <div class="controls">

                        <label class="checkbox">

                            <input type="checkbox" value="remember" /> Remember me

                        </label>

                    </div>

                </div>

                <div class="form-group">

                    <div class="controls">

                        <button type="submit" class="btn btn-primary form-control" name="btn_admin_login" id="btn_admin_login">Sign In</button>

                    </div>

                </div>

</form>



and in controller as follow,


<?php

class WebmanagerController extends Controller

{

	public function actionLogin()

	{

		$model=new AdminLogin;


		if(isset($_POST['btn_admin_login']))

		{

			if($model->validate())

			{

				echo 'validation complete';

			}

			else

			{

				Yii::app()->user->setFlash('error',$model->getErrors());

			}

		}

		$this->renderPartial('//admin/admin-login',array('model'=>$model));

	}

}

?>

Question : how can i display validation message on view and how can i get post value in controller?

why don’t you use CActiveForm? I think it is the best way do build forms in yii.