两列比较差异

   每次遇到两列比较，都是自己凭眼睛看，觉得自己特傻。虽然知道EXCEL有这个功能但是不会也懒得去百度。。。。。。。。。。。。

1.WPS

2.自己也做了一个小程序

  private void button1_Click(object sender, EventArgs e)
        {
            string[] strAList = richTextBox1.Text.Split('\n');
            string[] strBList = richTextBox2.Text.Split('\n');
            richTextBox3.Text = "";
            foreach (string strB in strBList)
            {
                foreach (string strA in strAList)
                {
                    strC = strB;
                    if (strB.Equals(strA))
                    {
                        flag = true;
                        break;
                    }                    
                }
                if (flag)
                {
                   flag = false;
                }
                else
                {
                    richTextBox3.Text = richTextBox3.Text + strC + "\n";
                }
            }
        }

天下之事，为之则易，不为则难