主要找到以下类库：

1. MyXls(http://sourceforge.net/projects/myxls/)
2. Koogra(http://sourceforge.net/projects/koogra/)　　
3. ExcelLibrary(http://code.google.com/p/excellibrary/)
4. ExcelPackage(http://excelpackage.codeplex.com/)
5. EPPlus(http://epplus.codeplex.com/)
6. LinqToExcel(http://code.google.com/p/linqtoexcel/)
7. NetOffice(http://netoffice.codeplex.com/) 需安装Office Excel

从1－6的类库均不需要安装Office，不使用Office COM组件；而NetOffice需要安装Office，它提供的是与Office COM组件差不多的功能。

Excel2Object

Excel 与 Object 互相转换

使用的NPOI

https://github.com/tonyqus/npoi

1. EPPlus(http://epplus.codeplex.com/)

protected void UploadButton_Click(Object sender, EventArgs e){    if (FileUpload1.HasFile && Path.GetExtension(FileUpload1.FileName) == ".xlsx")    {        using (var excel = new ExcelPackage(FileUpload1.PostedFile.InputStream))        {            var tbl = new DataTable();            var ws = excel.Workbook.Worksheets.First();            var hasHeader = true;  // adjust accordingly            // add DataColumns to DataTable            foreach (var firstRowCell in ws.Cells[1, 1, 1, ws.Dimension.End.Column])                tbl.Columns.Add(hasHeader ? firstRowCell.Text                    : String.Format("Column {0}", firstRowCell.Start.Column));            // add DataRows to DataTable            int startRow = hasHeader ? 2 : 1;            for (int rowNum = startRow; rowNum <= ws.Dimension.End.Row; rowNum++)            {                var wsRow = ws.Cells[rowNum, 1, rowNum, ws.Dimension.End.Column];                DataRow row = tbl.NewRow();                foreach (var cell in wsRow)                    row[cell.Start.Column - 1] = cell.Text;                tbl.Rows.Add(row);            }            var msg = String.Format("DataTable successfully created from excel-file. Colum-count:{0} Row-count:{1}",                                    tbl.Columns.Count, tbl.Rows.Count);            UploadStatusLabel.Text = msg;        }    }    else     {        UploadStatusLabel.Text = "You did not specify a file to upload.";    }}