پر نشدن ComboBox1 توسط ComboBox دیگر

[alexmcse]

کدها رو به این صورت تغییر دهید

        private LinqToTrazoDataContext db;

        private void frmSalesInvoices_Load(object sender, EventArgs e)

        {

            db = new LinqToTrazoDataContext();

            var list = db.CommoTables.ToList();

            cmbCommodityName.DataSource = list; 

            //cmbCommodityName.ValueMember = "RowCommo";

            cmbCommodityName.DisplayMember = "CommodName";

            

        }









        private void cmbCommodityName_SelectedIndexChanged(object sender, EventArgs e)

        {

            if (cmbCommodityName.SelectedIndex != -1)

            {

                var SizeCheng = from d in db.CommoTables

                    where d.CommodName == cmbCommodityName.SelectedText

                    select d;

                comboBox1.DataSource = SizeCheng;

             //   comboBox1.ValueMember = "RowCommo";

                comboBox1.DisplayMember = "CommodSize";

            

            }