有时候经常用到，做个记录
判断上传文件为Excel：
if ((this.FileUpload1.PostedFile.ContentType == "application/vnd.ms-excel") || (this.FileUpload1.PostedFile.ContentType == "application/ms-excel") || (this.FileUpload1.PostedFile.ContentType== "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")) {}
03版Excel链接字符串：
strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath(savePath) + ";Extended Properties='Excel 8.0;HDR=No;IMEX=1'";
07以上版Excel链接字符串：
strConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + Server.MapPath(savePath) + ";Extended Properties='Excel 8.0;HDR=Yes;IMEX=1';";