上载“输入字符串的格式不正确”

我正在尝试使用C＃在asp.net中将.csv文件数据导入（上传）到我的数据库中，但收到通知，提示输入的字符串格式不正确。请帮忙。谢谢！

错误行：dt.Rows [dt.Rows.Count-1] [i] =单元格；

// Upload and save file
    string csvPath = Server.MapPath("~/FileUploads/") + Path.GetFileName(FileUpload1.PostedFile.FileName);
    FileUpload1.SaveAs(csvPath);

    DataTable dt = new DataTable();
    dt.Columns.AddRange(new DataColumn[11] { new DataColumn("Name", typeof(string)),
        new DataColumn("NRIC", typeof(string)),
        new DataColumn("Gender", typeof(string)),
        new DataColumn("BirthYear", typeof(int)),
        new DataColumn("Number", typeof(int)),
        new DataColumn("PostalCode", typeof(int)),
        new DataColumn("CoursesAttended", typeof(string)),
        new DataColumn("Language", typeof(string)),
        new DataColumn("DateAttended", typeof(string)),
        new DataColumn("TrainingPlaces", typeof(int)),
        new DataColumn("Remarks", typeof(string)) });

    string csvData = File.ReadAllText(csvPath);

    foreach (string row in csvData.Split('\n'))
    {
        if (!string.IsNullOrEmpty(row))
        {
            dt.Rows.Add();
            int i = 0;

            foreach (string cell in row.Split(','))
            {
                dt.Rows[dt.Rows.Count - 1][i] = cell;
                i++;
            }
        }
    }

    string conString = ConfigurationManager.ConnectionStrings["SilverInfocomm"].ConnectionString;

    using (SqlConnection con = new SqlConnection(conString))
    {
        using (SqlBulkCopy bulk = new SqlBulkCopy(con))
        {
            // Set database table name
            bulk.DestinationTableName = "dbo.FileUploads";
            con.Open();
            bulk.WriteToServer(dt);
            con.Close();
        }
    }