Asp.Net Usercontrol with ddl.

//This is the code for usercontrol which i have written
protected void Page_Load(object sender, EventArgs e)
{

if (IsPostBack)
{
//Binding the years to DropDownLists.
string date = System.DateTime.Now.ToString("yyyy");
for (int i = 1981; i <= int.Parse(date); i++)
{
ddlFromYear.Items.Add(i.ToString());
ddlToYear.Items.Add(i.ToString());

}


//Binding University to Dropdownlist

//Binding Colleges to Dropdownlist

//Binding Qualification to Dropdownlist

}
}
//on page load of aspx page one usercontrol is loaded as abydefault and second Usercontrol is added on button click
//And for aspx page i have added UC on add button click its code is as follows:

protected void btnAddAca_Click(object sender, EventArgs e)
{
//When candidate click on Add button...
//add new user control
Control ucNew1 = LoadControl("~/usercontrols/UpdateAcadamicDetails.ascx");

HtmlGenericControl tempDiv1 = new HtmlGenericControl();
tempDiv1.Attributes.Add("runat", "server");
tempDiv1.ID = "divAcaControl" + int.Parse(ViewState["COUNT2"].ToString());
tempDiv1.Controls.Add(ucNew1);
//PHAca is a placeholder on aspx page
PHAca.Controls.Add(tempDiv1);
}

********************************************************************




I have used
if(!IsPostBack)
{
// code here
}

but only first time the ddl will be populated but for second time it will not show any data.......

In the above code i have used update panel for placeholder on the .aspx and even i have used trigger in update panel but than also it wont work.For the first time the above code is running fine but when one more usercontrol is it does not show any data in ddl.now here i tried to remove Ispostback at usercontrol .cs page than also it wont work.

Use improve question link and paste your code there with in pre tag

Need to see your code to understand what you are doing.