title: call dropdownlist selected index changed event manually
body: <p>i have a dropdown which fill on page load event.</p>
  
  <pre><code>private void FillSponsor()
      {
          ddlSponsor.DataSource = Db.VCT_SPONSORs.Where(x =&gt; x.IS_ACTIVE.GetValueOrDefault() &amp;&amp; x.IS_APPROVED.GetValueOrDefault());
          ddlSponsor.DataBind();
      }
  </code></pre>
  
  <p>Now what i want is to bind other dropdown with the first value of above dropdown. my second dropdown is:</p>
  
  <pre><code>protected void ddlSponsor_SelectedIndexChanged(object sender, EventArgs e)
      {
          ddlDivision.DataSource = Db.VCT_SPONSOR_DIVISIONs.Where(x =&gt; x.SPONSOR_ID==SponsorID);
          ddlDivision.DataBind();
          ddlDivision.Items.Insert(0, new ListItem("All", "0"));
      }
  </code></pre>
  
  <p>My problem is how to call ddlSponsor_SelectedIndexChanged event  from the FillSponsor method. My both dropdowns are in update panels.</p>