获得excel的sheet名字

/// 
/// This mehtod retrieves the excel sheet names from 
/// an excel workbook.
/// 
/// The excel file.
/// String[]
private String[] GetExcelSheetNames(string excelFile)
{
  OleDbConnection objConn = null;
  System.Data.DataTable dt = null;
 
  try
  {
    // Connection String. Change the excel file to the file you
    // will search.
    String connString = "Provider=Microsoft.Jet.OLEDB.4.0;" + 
        "Data Source=" + excelFile + ";Extended Properties=Excel 8.0;";
    // Create connection object by using the preceding connection string.
    objConn = new OleDbConnection(connString);
    // Open connection with the database.
    objConn.Open();
    // Get the data table containg the schema guid.
    dt = objConn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
 
    if(dt == null)
    {
      return null;
    }
 
    String[] excelSheets = new String[dt.Rows.Count];
    int i = 0;
 
    // Add the sheet name to the string array.
    foreach(DataRow row in dt.Rows)
    {
      excelSheets[i] = row["TABLE_NAME"].ToString();
      i++;
    }
 
    // Loop through all of the sheets if you want too...
    for(int j=0; j < excelSheets.Length; j++)
    {
      // Query each excel sheet.
    }
 
    return excelSheets;
  }
  catch(Exception ex)
  {
    return null;
  }
  finally
  {
    // Clean up.
    if(objConn != null)
    {
      objConn.Close();
      objConn.Dispose();
    }
    if(dt != null)
    {
      dt.Dispose();
    }
  }
}