C# Implements Merge, Copy and Clone of Table

private void button1_Click(object sender, EventArgs e)//Button click trigger event    {
      #region Table's Merge      DataTable dt = new DataTable();

      DataTable dt1 = new DataTable();//Create Table1      ("ID", typeof(string));
      ("NAME",typeof(string));
      ("AGE", typeof(int));
      ("SEX", typeof(string));

       = new DataColumn[] { ["ID"]};
      for (int i = 0; i < 5; i++)
      {
        DataRow dr = ();
        dr["ID"] = "00" + ();
        dr["NAME"] = "00-" + ();
        dr["AGE"] = 15 + i;
        dr["SEX"] = "M";
        (dr);

      }
      dt = dt1;

      DataTable dt2 = new DataTable();//Create Table2      ("ID", typeof(string));
      ("NAME", typeof(string));
      ("Course",typeof(string));
      ("Score",typeof(int));

       = new DataColumn[] { ["ID"] };
      for (int i = 0; i < 5; i++)
      {
        DataRow dr = ();
        dr["ID"] = "00" + ();
        dr["NAME"] = "00-" + ();
        dr["Course"] ="C#";
        dr["Score"] = i + 80;
        (dr);
      }
      dt = dt2;
      (dt2);

      //Copy
      var table1 = ();//Copy, copy table structure and data      //Add a new line      DataRow dr1 = ();
      dr1["ID"] = "005";
      dr1["NAME"] = "00-5";
      dr1["AGE"] = 15;
      dr1["SEX"] = "F";
      (dr1,2);//Insert a newly added row at the specified position of the table       
      (new DataColumn() { ColumnName = "Memo", DataType = typeof(string) });//Default insert to the last column      ["Memo"].SetOrdinal(0);//Move the inserted column to the first row
      int memoIndex = ("Memo");//Get the column location information      var isContainName = ("NAME");//Judge whether there is a column in the table
      List<string> columnsNameList = new List<string>();//Transfer to get all column names of table      foreach (DataColumn col in )
      {
        ();
      }

      (memoIndex);//Remove through column name index      (2);//Remove through column name index
      ("SEX");//Remove through column names, it is recommended to make the latter      

      string[] name = new string[];//Method 1: traversal output of the data in the table      string[] id = new string[];
      for (int i = 0; i < ; i++)
      {
        name[i] = [i]["NAME"].ToString();
        id[i] = [i]["ID"].ToString();
      }
           
      ();//Clear the data in the table
      //Clone
      var table2 = ();//Clone, copy the structure and constraint information of the table
      #endregion

    }