importing excel to sql c#

我一直试图导入一个excel表到我的sql数据库。我试过这个例子:

     void importdata(string excelfilepath)
     {
        //declare variables - edit these based on your particular situation
        string ssqltable = "tTableExcel";
        // make sure your sheet name is correct, here sheet name is sheet1,      so you can change your sheet name if have
        string myexceldataquery = "select student,rollno,course from [sheet1$]";
        try
        {
           //create our connection strings
           string sexcelconnectionstring = @"provider=microsoft.jet.oledb.4.0;data source=" + excelfilepath +
           ";extended properties=" + "'"excel 8.0;hdr=yes;'"";
           string ssqlconnectionstring = "server=mydatabaseservername;userid=dbuserid;password=dbuserpassword;database=databasename;connection reset=false";

           string sclearsql = "delete from " + ssqltable;
           SqlConnection sqlconn = new SqlConnection(ssqlconnectionstring);
           SqlCommand sqlcmd = new SqlCommand(sclearsql, sqlconn);
           sqlconn.Open();
           sqlcmd.ExecuteNonQuery();
           sqlconn.Close();
           //series of commands to bulk copy data from the excel file into our sql table
           OleDbConnection oledbconn = new OleDbConnection(sexcelconnectionstring);
           OleDbCommand oledbcmd = new OleDbCommand(myexceldataquery, oledbconn);
           oledbconn.Open();
           OleDbDataReader dr = oledbcmd.ExecuteReader();
           SqlBulkCopy bulkcopy = new SqlBulkCopy(ssqlconnectionstring);
           bulkcopy.DestinationTableName = ssqltable;
           while (dr.Read())
           {
              bulkcopy.WriteToServer(dr);
           }
           oledbconn.Close();
        }
        catch (Exception ex)
        {
           //handle exception
        }
     }

我的程序不是很好，我不能使它工作。SQL连接没有任何问题(运行程序后，数据库被清除)。但是我无法将任何信息输入数据库。我的excel文件名为test.xlsx，存储在D:'Users'Haners中。我的数据库表名为Test。我怎样才能使我的程序导入excel文件中的信息到数据库??

       SqlBulkCopy bulkcopy = new SqlBulkCopy(ssqlconnectionstring);
       bulkcopy.DestinationTableName = ssqltable;
       while (dr.Read())
       {
          bulkcopy.WriteToServer(dr);
       }

       SqlBulkCopy bulkcopy = new SqlBulkCopy(ssqlconnectionstring);
       bulkcopy.DestinationTableName = ssqltable;
       bulkcopy.BatchSize=100;
       bulkcopy.WriteToServer(dr);