Excel数据，dataGridview, openFileDialog

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从Excel中读取数据，在WinForm界面的DataGridView中进行显示。使用的Excel2007;
private void btnOpen_Click(object sender, EventArgs e)//文件读取，
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.CheckFileExists = true;//验证文件是否存在
            openFileDialog.CheckPathExists = true;//验证路径
            openFileDialog.FileName = "";//选择文件对话框打开后，选择文件初始化对话框为空
            openFileDialog.Title = "读取文件表格";//选择对话框的名字
            openFileDialog.InitialDirectory = @"c:\库\文档";//初始路径设置
            openFileDialog.Filter = "文件.xlsx|*.xlsm|wenjian.*|*.*";//文件筛选器。注意在VBA中也存在文件筛选器，不过并不是使用|隔开，而是使用，隔开
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                txtOpenFileName.Text = openFileDialog.FileName;
            }
        }
        ////////////////////////////////////////////////////////

       private void btnRead_Click(object sender, EventArgs e)
        {
            String strPath = txtOpenFileName.Text;
            DataTable dataTable =GetDataSet(strPath).Tables["Sheet1"];
            bgwShow.RunWorkerAsync(dataTable.Rows.Count);
            dgvShow1.DataSource = dataTable;//为名字为dgvShow1的dataGridview控件的datasource属性赋值
        }
public DataSet GetDataSet(String path)
        {

            String strConnection = "";
            OleDbConnection oleDbConnection = null;
            try
            {
                strConnection = "Provider=Microsoft.Ace.OleDb.12.0;" + "data source=" + path +

         ";Extended Properties='Excel 12.0; HDR=YES;IMEX=1'";//连接字符串，path是Excel文件的绝对路径,可以openFileDialog空间进行读取
                oleDbConnection = new OleDbConnection(strConnection);
                String sql = "SELECT * FROM [sheet1$]";//Excel相当于是一个简单的数据库，所以可以使用查询语句，并且表格要用[]加美元符号
                OleDbDataAdapter oleDbDataAdapter = new OleDbDataAdapter(sql, oleDbConnection);
                DataTable dataTable = new DataTable("Sheet1");//new一个名字为Sheet1的表格，便于填充
                DataSet dataSet = new DataSet();
                dataSet.Tables.Add(dataTable);//将表格放入到dataSet数据集中
                oleDbDataAdapter.Fill(dataSet, "Sheet1");//填充数据集中名为Sheet1的表格
                return dataSet;
            }
            catch (Exception ee)
            {
                throw new Exception(ee.Message);
            }
            finally
            {
              oleDbConnection.Dispose();
            }
        }