Excel导入DataSet

OpenFileDialog openFileDialog1 = new OpenFileDialog();
// this.SetStyle("Table");
string file="";
openFileDialog1.Filter = "Excel数据文件|*.xls";
openFileDialog1.RestoreDirectory = true;
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
file = openFileDialog1.FileName;
try
{
string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + file + ";" + "Extended Properties=Excel 8.0;";
OleDbConnection conn = new OleDbConnection(strConn);
conn.Open();
OleDbDataAdapter myCommand = null;
DataSet ds = null;
string strExcel = "select * from [" + "sheet1"+ "$]";
myCommand = new OleDbDataAdapter(strExcel, strConn);
ds = new DataSet();
myCommand.Fill(ds, "sheet1");
conn.Close();
dataGridView1.DataSource = ds.Tables[0];
}
catch (Exception loErr)
{
MessageBox.Show(loErr.Message);
}

}