dropdownlist auto post back errors
<p>there are some item in my database,on page load, my dropdownlist will load all the item from db, what i want to achieve is whenever user selected any item from dropdownlist, there are some output will be display</p>

<p><strong>item inside my db</strong></p>

<p>a</p>

<p>b</p>

<p>c</p>

<p>once i set dropdownlist auto post back =true (it can achieve one of my requirement, once there are item selected, some output display, but there are problems for data load)</p>

<p><strong>output in dropdownlist</strong></p>

<p>a</p>

<p>b</p>

<p>c</p>

<p>a</p>

<p>b</p>

<p>c</p>

<p>a</p>

<p>b</p>

<p>c</p>

<p>it will repeated for 3 time</p>

<p>once i set autopostback =false (data load no problem,but cant display my output)</p>

<p>below is the code for my dropdownlist</p>

<pre><code>while (dtrLoad.Read())
        {

           ddlCourse.Items.Add(dtrLoad["subject"].ToString());

           if(ddlCourse.SelectedItem.Text=="Please Select"){
               p1.InnerHtml = "Welcome";
           }else if(ddlCourse.SelectedItem.Text==dtrLoad["subject"].ToString()){
               p1.InnerHtml=dtrLoad["subjectIntroduction"].ToString();
           }else{
           }

        }
</code></pre>
