Iterate through a single specified row of an excel sheet using vsto in C# code?

You can simply iterate through a specified row or specified Range by using the following code, in which you can update your range as per your requirement.

List<string> myValue = new List<string>();
  foreach (Microsoft.Office.Interop.Excel.Range row in sheet.Cells.Rows.Range["A1","D1"])
      {
        Microsoft.Office.Interop.Excel.Range cell = (Microsoft.Office.Interop.Excel.Range)row.Cells[1, 1];
          if (cell.Value2 != null)
             {
                myValue.Add(Convert.ToString(cell.Value2));
             }
      }