Datatable's merge method and addition of datatable to Dataset

The merge method combines two data tables with similar structures into one data table:
Instance Code :

    //  Create Table1    Datatable dt1  =     New  Datatable (); dt1.columns. Add (  "  ID  " ); Dt1.columns. Add (  "  Name  "  ); Dt1.columns. Add (  "  PWD  "  );  For  (  Int  I  =     0  ; I  <    5  ; I  ++  ) {Dt1.rows. Add (  New     Object  [] {I. tostring (),  "  Name  "     +  I. tostring (),  "  **  " });}  //  Create Table2    Datatable dt2  =     New  Datatable (); dt2.columns. Add (  "  ID  "  ); Dt2.columns. Add (  "  Name  "  ); Dt2.columns. Add ( "  PWD  "  );  For  (  Int  I  =     5  ; I  <     10  ; I  ++  ) {Dt1.rows. Add ( New     Object  [] {I. tostring (),  "  Name  "     +  I. tostring (),  "  **  "  });}  //  Merge two tables   Datatable dt3  =     Null  ; Dt3  =  Dt1.clone ();  If  (Dt3  ! =     Null  ) {Dt3.merge (dt1); dt3.merge (dt2 );  This  . Datagridview1.datasource  =  Dt3 ;} 

Add datatable to Dataset

  Datatable dt  =     New  Datatable (); DT. Columns. Add (  "  ID  "  ); DT. Columns. Add (  "  Name  "  ); DT. Columns. Add (  " PWD  "  );  For  (  Int  I  =     0  ; I  <     10  ; I  ++  ) {DT. Rows. Add (  New    Object  [] {I. tostring (),  "  Name  "  +  I. tostring (),  "  **  "  });} Dataset DS  =     New  Dataset (); DS. Tables. Add (DT );  This . Datagridview1.datasource  =  DS. Tables [  0  ]. Defaultview;