Excel数据，dataGridview, openFileDialog

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();
}
}