Microsoft Interop: Excel-Spalten-Namen

     Excel.Application xlApp = new Excel.Application();
     Excel.Workbook xlWorkbook = xlApp.Workbooks.Open("workbookname");
     Excel.Worksheet xlWorksheet = xlWorkbook.Sheets[1]; //assume it is the first sheet
     int columnCount = xlWorksheet.UsedRange.Columns.Count;
     List<string> columnNames = new List<string>();
     for (int c = 1; c < columnCount; c++)
     {
         if (xlWorksheet.Cells[1, c].Value2 != null)
         {
             string columnName = xlWorksheet.Columns[c].Address;
             Regex reg = new Regex(@"(\$)(\w*):");
             if (reg.IsMatch(columnName))
             {
                 Match match = reg.Match(columnName);             
                 columnNames.Add(match.Groups[2].Value);
             }                      
        }
     }

Dadurch wird jeder Spaltenname in eine List<string> dem kann man dann eine Bindung zu einem drop-down-box.