Изменение значения в таблице через запрос

private void button2_Click(object sender, EventArgs e)
        {
            DataTable tabzap = new DataTable();
            DAzap = new SqlDataAdapter(
                "SELECT * FROM Realization" +
                "WHERE Sales_price = Sales_price * 1.15", cnn);
            BDzap = new SqlCommandBuilder(DAzap);
            DAzap.Fill(tabzap);
            GridViewRealization.DataSource = tabzap;
        }

DAzap = new SqlDataAdapter("UPDATE Realization SET Sales_price = Sales_price * 1.15", cnn);

private void button2_Click(object sender, EventArgs e)
        {
            DataTable tabzap = new DataTable();
            DAzap = new SqlDataAdapter("UPDATE Realization SET Sales_price = Sales_price * 1.15", cnn);
            BDzap = new SqlCommandBuilder(DAzap);
            DAzap.Fill(tabzap);
            GridViewRealization.DataSource = tabzap;
            
        }

        private void button2_Click(object sender, EventArgs e)
        {
            DataTable tabzap = new DataTable();
            DAzap = new SqlDataAdapter("UPDATE Realization SET Sales_price = Sales_price * 1.15", cnn);
            BDzap = new SqlCommandBuilder(DAzap);
            DAzap.Fill(tabzap);
            GridViewRealization.DataSource = tabzap;
 
            DAreal = new SqlDataAdapter("SELECT * FROM Realization", cnn);
            BDreal = new SqlCommandBuilder(DAreal);
            DAreal.Fill(DSreal, "Realization");
            BD7.DataSource = DSreal;
            BD7.DataMember = "Realization";
            GridViewRealization.DataSource = BD7;
        }