Asp.net 导入的Excel工作表未正常排序

下面的代码将数据从excel工作表导入ASP.Net网页，并将其保存在我的数据库中的SQL server中

在ASP网页或数据库中，当我从所需的工作表中导入数据时，它不是按照默认的排序导入的，这会严重影响最终的结果并丢失数据。 有关更多说明，如果excel工作表中第一个ID为“1”，活动为“新安装”，等等……在ASP网页和SQL数据库中，可能出现在第九行，并且没有完整数据

    using System;

    using System.Collections.Generic;

    using System.Linq;

    using System.Web;

    using System.Web.UI;

    using System.Web.UI.WebControls;

    using System.IO;

    using System.Data;

    using System.Data.OleDb;

    namespace ImpExpExc
    {
    public partial class Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                PopulateData();
                lblMessage.Text = "Current Database Data!";
            }
        }




        private void PopulateData()
        {
            using (TEDataEntities dc = new TEDataEntities())
            {
                gvData.DataSource = dc.ImportExportExcels.ToList();
                gvData.DataBind();
            }
        }

        protected void btnImport_Click(object sender, EventArgs e)
        {
            if (FileUpload1.PostedFile.ContentType == "application/vnd.ms-excel" || 
                FileUpload1.PostedFile.ContentType == "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
            {
                try
                {
                    string fileName = Path.Combine(Server.MapPath("~/ImportDocument"), Guid.NewGuid().ToString() + Path.GetExtension(FileUpload1.PostedFile.FileName));
                    FileUpload1.PostedFile.SaveAs(fileName);

                    string conString = "";
                    string ext = Path.GetExtension(FileUpload1.PostedFile.FileName);
                    if (ext.ToLower() == ".xls")
                    {
                        conString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fileName + ";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=2\"";
                    }
                    else if (ext.ToLower() == ".xlsx")
                    {
                        conString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + fileName + ";Extended Properties=\"Excel 12.0;HDR=Yes;IMEX=2\"";
                    }

                    string query = "Select [ID], [Activities], [Governorate], [Exchange], [Client], [Technician], [CircuitNo], [Comment], [Date] from [Sheet1$]";
                    OleDbConnection con = new OleDbConnection(conString);
                    if (con.State == System.Data.ConnectionState.Closed)
                    {
                        con.Open();
                    }
                    OleDbCommand cmd = new OleDbCommand(query, con);
                    OleDbDataAdapter da = new OleDbDataAdapter(cmd);

                    DataSet ds = new DataSet();
                    da.Fill(ds);
                    da.Dispose();
                    con.Close();
                    con.Dispose();

                    //Import to Database
                    using (TEDataEntities dc = new TEDataEntities())
                    {
                        foreach (DataRow dr in ds.Tables[0].Rows)
                        {
                            string empID = dr["ID"].ToString();
                            var v = dc.ImportExportExcels.Where(a => a.ID.Equals(empID)).FirstOrDefault();
                            if (v != null)
                            {
                                //Update here
                                v.Activities = dr["Activities"].ToString();
                                v.Governorate = dr["Governorate"].ToString();
                                v.Exchange = dr["Exchange"].ToString();
                                v.Client = dr["Client"].ToString();
                                v.Technician = dr["Technician"].ToString();
                                v.CircuitNo = dr["CircuitNo"].ToString();
                                v.Comment = dr["Comment"].ToString();
                                v.Date = dr["Date"].ToString();

                            }
                            else
                            {
                                //Insert here
                                dc.ImportExportExcels.AddObject(new ImportExportExcel
                                {
                                    ID = dr["ID"].ToString(),
                                    Activities = dr["Activities"].ToString(),
                                    Exchange = dr["Exchange"].ToString(),
                                    Client = dr["Client"].ToString(),
                                    Technician = dr["Technician"].ToString(),
                                    CircuitNo = dr["CircuitNo"].ToString(),
                                    Comment = dr["Comment"].ToString(),
                                    Date = dr["Date"].ToString()
                                });
                            }
                        }
                        dc.SaveChanges();
                    }
                    PopulateData();
                    lblMessage.Text = "Successfully data import done!";
                }
                catch (Exception)
                {

                    throw;
                }
            }

        }
    }
}

---

最后，通过在数据库中添加具有增量ID的附加列解决了排序问题，但仍然有一些与日期相关的单元格是空的

我认为出现此问题是因为代码中的ID是字符串，而数据库中的nvarchar（50）是整数，但我不知道如何在代码中使其成为整数