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Grid2.Rows[I2].CommaText := Grid1.Rows[I1].CommaText;                    

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unit testUebertrag;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, Grids;

type
  TForm1 = class(TForm)
    StringGrid1: TStringGrid;
    StringGrid2: TStringGrid;
    buuebertrag: TButton;
    procedure buuebertragClick(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.buuebertragClick(Sender: TObject);
var
  i : integer;
begin
   for i := 0 to 4 do
     Stringgrid2.Rows[i].CommaText := Stringgrid1.Rows[i].Commatext;
end;

end.                    

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Grid2.Rows[I2].Assign(Grid1.Rows[I1]);                    

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var
  a, b: string;
begin
  a := 'test';
  b := a;
  ShowMessage(a);
  ShowMessage(b);
end;