如何使用c#windows form应用程序将excel文件上传到sql数据库表

我想通过c#中的windows表单应用程序上传excel文件,并希望将数据导入数据库(Mysql服务器).我怎样才能做到这一点？？？我创建了一个表单,要求我将excel文件上传到mysql数据库.它是一个批量插入数据到数据库表.

我的Excel文件包含userid,password,first_name,last_name,user_group和MySql Database表(aster_users)等列,包含许多列,如userid,password,first_name,last_name,user_group,queue,active,created_date,created_by,role ..

我需要将该excel文件上传到我的数据库,其他列将变为空或null,这不是问题.

我的表格设计是

这是我的c#代码:

using MySql.Data.MySqlClient;
using System;
using System.Data.SqlClient;
using System.Windows.Forms;

namespace UploadFileToDatabase
{
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();       
    }

    String MyConString = "SERVER=******;" +
           "DATABASE=dbs;" +
           "UID=root;" +
           "PASSWORD=pwsd;" + "Convert Zero Datetime = True";
private void BtnSelectFile_Click(object sender, EventArgs e)
    {
        OpenFileDialog dlg = new OpenFileDialog();
        dlg.Filter = "Text files | *.csv";
        if (dlg.ShowDialog() == DialogResult.OK)
        {
            string fileName;
            fileName = dlg.FileName;
            txtfilepath.Text = fileName;
        }
      }

private void btnUpload_Click(object sender, EventArgs e)           
 {                
    string connectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + txtfileparth.Text + ";Extended Properties=\"Excel 12.0;HDR=YES;\"";

        using (OleDbConnection connection =
              new OleDbConnection(connectionString))
        {
            OleDbCommand command = new OleDbCommand
                    ("Select * FROM [Sheet1$]", connection);

            connection.Open();

            using (DbDataReader dr = command.ExecuteReader())
            {
                string sqlConnectionString = MyConString;

                using (SqlBulkCopy bulkCopy = new SqlBulkCopy(sqlConnectionString))
                {
                    bulkCopy.ColumnMappings.Add("[userid]", "userid");
                    bulkCopy.ColumnMappings.Add("password", "password");
                    bulkCopy.ColumnMappings.Add("first_name", "first_name");
                    bulkCopy.ColumnMappings.Add("last_name", "last_name");
                    bulkCopy.ColumnMappings.Add("user_group", "user_group");
                    bulkCopy.DestinationTableName = "aster_users";
                    bulkCopy.WriteToServer(dr);
                    MessageBox.Show("Upload Successfull!");
                }
            }

        }
}

这是我试过的方式.我得到了这样的错误信息

附加信息:外部表格不是预期的格式.

在这行 连接.Open(); .如何才能做到这一点？

using System;
using System.Data;
using System.Data.OleDb;
using System.Data.SqlClient;
using System.Windows.Forms;

namespace IMPORT
{
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }
    String MyConString = "SERVER=******;" +
           "DATABASE=db;" +
           "UID=root;" +
           "PASSWORD=pws;";

private void btnSelectFile_Click(object sender, EventArgs e)
    {
        OpenFileDialog openfiledialog1 = new OpenFileDialog();
        openfiledialog1.ShowDialog();
        openfiledialog1.Filter = "allfiles|*.xls";
        txtfilepath.Text = openfiledialog1.FileName;
    }
private void btnUpload_Click(object sender, EventArgs e)
{
 string path = txtfilepath.Text;

        string ConnString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + path + ";Extended Properties = Excel 8.0";

        DataTable Data = new DataTable();

        using (OleDbConnection conn =new OleDbConnection(ConnString))
        {
            conn.Open();

            OleDbCommand cmd = new OleDbCommand(@"SELECT * FROM [dataGridView1_Data$]", conn);
            OleDbDataAdapter adapter = new OleDbDataAdapter(cmd);
            adapter.Fill(Data);

            conn.Close();
        }
        string ConnStr = MyConString;
        using (SqlBulkCopy bulkCopy = new SqlBulkCopy(ConnStr))
        {
            bulkCopy.DestinationTableName = "TABLE NAME";
            bulkCopy.ColumnMappings.Add("userid", "userid");
            bulkCopy.ColumnMappings.Add("password", "password");
            bulkCopy.ColumnMappings.Add("first_name", "first_name");
            bulkCopy.ColumnMappings.Add("last_name", "last_name");
            bulkCopy.ColumnMappings.Add("user_group", "user_group");
            bulkCopy.WriteToServer(Data);
            MessageBox.Show("UPLOAD SUCCESSFULLY");
        }
     }
 }

一个例子是 http://technico.qnownow.com/bulk-copy-data-from-excel-to-destination-db-using-sql-bulk-copy/. 和 错误:附加信息:外部表格不是预期的格式