//加载Excel  
public static DataSet LoadDataFromExcel(string filePath) 
{ 
  try 
  { 
    string strConn; 
    strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filePath + ";Extended Properties='Excel 8.0;HDR=False;IMEX=1'"; 
    OleDbConnection OleConn = new OleDbConnection(strConn); 
    OleConn.Open(); 
    String sql = "SELECT * FROM [Sheet1$]";
    //可是更改Sheet名称，比如sheet2，等等  
    OleDbDataAdapter OleDaExcel = new OleDbDataAdapter(sql, OleConn);
    DataSet OleDsExcle = new DataSet(); 
    OleDaExcel.Fill(OleDsExcle, "Sheet1"); 
    OleConn.Close(); 
    return OleDsExcle; 
  } 
  catch (Exception err) 
  { 
    MessageBox.Show("数据绑定Excel失败!失败原因：" + err.Message, "提示信息", 
      MessageBoxButtons.OK, MessageBoxIcon.Information); 
    return null; 
  } 
} 

public static bool SaveDataTableToExcel(System.Data.DataTable excelTable, string filePath) 
{ 
  Microsoft.Office.Interop.Excel.Application app = 
    new Microsoft.Office.Interop.Excel.ApplicationClass(); 
  try 
  { 
    app.Visible = false; 
    Workbook wBook = app.Workbooks.Add(true); 
    Worksheet wSheet = wBook.Worksheets[1] as Worksheet; 
    if (excelTable.Rows.Count > 0) 
    { 
      int row = 0; 
      row = excelTable.Rows.Count; 
      int col = excelTable.Columns.Count; 
      for (int i = 0; i < row; i++) 
      { 
        for (int j = 0; j < col; j++) 
        { 
          string str = excelTable.Rows[i][j].ToString(); 
          wSheet.Cells[i + 2, j + 1] = str; 
        } 
      } 
    } 
    int size = excelTable.Columns.Count; 
    for (int i = 0; i < size; i++) 
    { 
      wSheet.Cells[1, 1 + i] = excelTable.Columns[i].ColumnName; 
    } 
    //设置禁止弹出保存和覆盖的询问提示框  
    app.DisplayAlerts = false; 
    app.AlertBeforeOverwriting = false; 
    //保存工作簿  
    wBook.Save(); 
    //保存excel文件  
    app.Save(filePath); 
    app.SaveWorkspace(filePath); 
    app.Quit(); 
    app = null; 
    return true; 
  } 
  catch (Exception err) 
  { 
    MessageBox.Show("导出Excel出错！错误原因：" + err.Message, "提示信息", 
      MessageBoxButtons.OK, MessageBoxIcon.Information); 
    return false; 
  } 
  finally 
  { 
  } 
}