How to display a CheckBoxList on selectedIndexChange action of a DropDownList?

Question

I have a CheckBoxList which displays data on a selectedIndexChange action of a DropDownList. Everything works correctly. I have checked it in a button click event. But When I use it with a selectedIndexChange nothing happens. I dont get any error or exception. I have enabled AutoPostBack property too.

Here is my code

<asp:CheckBoxList ID="chklstKPI" style="width:auto; height:auto;   float:right" runat="server" AutoPostBack="True">
</asp:CheckBoxList>

code of the CheckBoxList

public void loadCheckBoxPanel()
{
        DataSet ds = new DataSet();
        string cName = ddlCompName.SelectedValue.ToString();
        ds = db.fillCheck(cName);

        chklstKPI.DataSource = ds.Tables[0];
        chklstKPI.DataTextField = "COMPETITION_KPI";
        chklstKPI.DataValueField = "COMPETITION_KPI";
        chklstKPI.DataBind();

}

I didn't add the query.

Answer 1

bool isLoading = true;    
private void Form1_Load(object sender, EventArgs e)
    {
         chklstKPI.Style.Visibility="hidden";
         chklstKPI.Style.Displpay="none";
         myList.OnSelectedIndexChanged += performCheckBoxAction;
         myList.SelectedIndex=0;
         isLoading = false;               
    }
protected void performCheckBoxAction(object sender, EventArgs e){
    if(isLoading==false){
        isLoading = true;
        chklstKPI.Style.visibility="visible";
        chklistKPI.Style.display="show";
        isLoading=false;
    }
}