遍历数据库，如果有符合条件的对其操作：改变button的颜色：就是这个条件总是不符合.。帮我看看，谢谢了。

     
            = "select * from 座位表 where 座位号='" +but[i,j].Text + " ' and 片名='" + str + "'";
            oleDbConnection1.Open();
            int a = (int)oleDbCommand1.ExecuteNonQuery();
            if (a == 1)
            {
                but[i, j].BackColor = Color.Red;
            }
            else
            {
               
            }
            oleDbConnection1.Close();

            this.Controls.Add(but[i, j]);