protected void Page_PreRender(object sender, EventArgs e) { if (IsPostBack) { if (LibraryDistrictId.SelectedValue != SelectedDistrictId.Value) { SelectedDistrictId.Value = LibraryDistrictId.SelectedValue; LibraryBranchData.DataBind(); LibraryId.Items.Clear(); LibraryId.Items.Add(new ListItem("[Select a Library Branch]", string.Empty)); LibraryId.DataBind(); } } }