importing of Excel file to datagridview

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C#

i have an excel file with 2 columns ? iwant to get one column and all the rows of that column and then second column and all the rows of that column and those two column should continuously for 12 columns

for (int Cnum = 1; Cnum <= ShtRange.Columns.Count; Cnum++)
              {

                  if (Cnum == 1)
                  {
                      dt.Columns.Add((ShtRange.Cells[1, Cnum] as Excel.Range).Value2.ToString());
                      for (int Rnum = 1; Rnum <= 9; Rnum++)
                      {
                          dt.Rows.Add((ShtRange.Cells[Rnum, 1] as Excel.Range).Value2.ToString());

                      }
                  }
                  else if (Cnum == 2)
                  {

                      dt.Columns.Add((ShtRange.Cells[1, Cnum] as Excel.Range).Value2.ToString());


                      for (int Rnum = 1; Rnum <= 9; Rnum++)
                      {

                          dt.Rows.Add((ShtRange.Cells[Rnum, Cnum] as Excel.Range).Value2);


                      }
                  }