Button clears other input fields
<p>In my web page am having some dropdown lists. OnSelectedIndexChanged of ddl1 I am binding dropdown lists ddl2 and ddl3 . Once I click the button, ddl2 and ddl3 values clearing.
This happens during postback of Button1. The postback of button1 fires ddl1 OnSelectedIndexChanged event.
Am using Dotnet framework 2.0</p>

<pre><code>protected void Page_Load(object sender, EventArgs e) 
{ 
    widestData = 0; 
    lblPCno.Visible = false; 
    if (!IsPostBack) 
    { 
        FillCombos(); 
        BindCoverGridview(); 
    }
}

protected void OnBtnClick(object sender, EventArgs e)
{
    FillCoverDtls(vShowroom, vCategory,vsubCategory.ToString(),vFamily.ToString()); 
    lblCount.Text = "Total : " + grdCoverDetails.Rows.Count.ToString(); 
}
</code></pre>
