Selecting from DropdownList Reloads Page

Selecting from DropdownList Reloads Page

Hi,
I have 2 dropdownlist controls.
I bind the controls when the page loads.

However, when I select from the dropdownlist the page reloads and the bindings are reset. Meaning that the default value is always selected.

How do I fix this? Below is my code. Thanks.

if (!IsPostBack)
{
NameList.DataSource = NameDataSet;
NameList.DataTextField = "Name";
NameList.DataValueField = "Name";
NameList.DataBind();

DateDropDownList.DataSource = DateDataSet;
DateDropDownList.DataTextField = "Date";
DateDropDownList.DataValueField = "Date";
DateDropDownList.DataBind();

name = NameList.Text;
date = DateTime.Parse(DateDropDownList.Text);
loadData();

}
else {

}

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