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    public partial class yprSpeedwayEdit : MasterForm
    ...{       
        public yprSpeedwayEdit()
        ...{
            InitializeComponent();
            this.uc_c_startyear1.ddl_startyear.SelectedIndexChanged += new System.EventHandler(ddl_startyear_SelectedIndexChanged);
        }
}

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        private void ddl_startyear_SelectedIndexChanged(object sender, EventArgs e)
        ...{
            MessageBox.Show(this.uc_c_startyear1.ddl_startyear.Text);
        }