将Excel数据读入DataGridView

OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.Filter = "Microsoft Excel files(*.xls)|*.xls;*.xlsx";//过滤一下，只要表格格式的
            openFileDialog.InitialDirectory = "c:\\";
            openFileDialog.RestoreDirectory = true;
            openFileDialog.FilterIndex = 1;
            openFileDialog.AddExtension = true;
            openFileDialog.CheckFileExists = true;
            openFileDialog.CheckPathExists = true;
            openFileDialog.ShowHelp = true;
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                string fileName = openFileDialog.FileName;
                string strConn = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source =" + openFileDialog.FileName + ";Extended Properties=Excel 12.0";
                OleDbConnection conn = new OleDbConnection(strConn);
                conn.Open();
                string strExcel = "";
                OleDbDataAdapter myCommand = null;
                DataSet ds = null;
                strExcel = "select * from [Sheet1$]";
                myCommand = new OleDbDataAdapter(strExcel, strConn);
                ds = new DataSet();
                myCommand.Fill(ds, "table1");
                dgv.DataSource = ds.Tables[0];
            }