إضافة اعمدة Columns إلى dataGridView1
        private void btnAdd_Click(object sender, EventArgs e)
        {
            dataGridView1.ColumnCount = 11;
            dataGridView1.Columns[0].Name = "ItemID";
            dataGridView1.Columns[1].Name = "ItemName";
            dataGridView1.Columns[2].Name = "Quantity";
            dataGridView1.Columns[3].Name = "FreeQuantity";
            dataGridView1.Columns[4].Name = "ItemUnitName";
            dataGridView1.Columns[5].Name = "Price";
            dataGridView1.Columns[6].Name = "TotalCost";
            dataGridView1.Columns[7].Name = "Discount";
            dataGridView1.Columns[8].Name = "Total";
            dataGridView1.Columns[9].Name = "Notes";
            dataGridView1.Columns[10].Name = "Delete";
            dataGridView1.Rows.Add();
        }
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