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// Excel Application 실행하기
        Excel.Application app = new Excel.Application();
        
        // 새로운 워크북 열기
        Excel.Workbook workbook1 = app.Workbooks.Add();
 
        // 기존에 있는 워크북 열기  (openFileDialog.FileName)가능
        Excel.Workbook workbook1 = app.Workbooks.Open(Filename:"주소");
 
        //저장하기
        workbook1.Save();
 
        //원하는 이름으로 저장하기
        workbook1.SaveAs(FileName:"저장하고픈 이름");
 
        // 새로운 워크싯 열기
        Exel.Worksheet ws = workbook1.Worksheets.Add();
 
        // 새로운 워크싯 열고 추가로 더열기(1)  총 2개
        Exel.Worksheet ws = workbook1.Worksheets.Add(Count:1);
 
        // 워크북에 있는 Sheet1 워크싯 가져오기
        Excel.Worksheet ws = workbook1.Worksheets.Item["Sheet1"];
        Excel.Worksheet ws2 = workbook1.Worksheets.Item["Sheet2"];
 
        // Sheet1이 Sheet2앞으로 오도록
        ws.Move(After: ws2);
 
        // 워크싯 이름을 내가 원하는 것으로 변경
        ws.Name ="원하는 이름으로 ㅎ";
 
        //워크싯 삭제하기
        ws.Delete();
 
        //마지막 워크싯 가져오기
        Excel.Worksheet ws = workbook1.Worksheets.Item[ workbook1.Worksheets.Count -1 ];
 
        // 워크싯 1,1 선택
        Excel.Range range = ws.Cells[1,1];
 
        // 워크싯 여러 범위 선택
        Excel.Range range = ws.range[ws.Cells[11], ws.Cells[33]];
 
        // 엑셀 범위 잡아도 됨
        Excel.Range range = ws.range["A1:C3"];
 
        // 값 넣기(문자도 가능)
        range.value = 1;
 
        //마지막 처리
        workbook.SaveAs("파일이름");
        workbook.Close();
cs


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