急急急， Excel 导入 Datagridview ?

#region 将Excel  导入 datagridview
        private void 导入ToolStripMenuItem_Click(object sender, EventArgs e)
        {

            //打开一个文件选择框
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Title = "Excel文件";
            ofd.FileName = "";
            ofd.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);//为了获取特定的系统文件夹，可以使用System.Environment类的静态方法GetFolderPath()。该方法接受一个Environment.SpecialFolder枚举，其中可以定义要返回路径的哪个系统目录
            ofd.Filter = "Excel文件(*.xls)|*.xls";
            ofd.ValidateNames = true;     //文件有效性验证ValidateNames，验证用户输入是否是一个有效的Windows文件名
            ofd.CheckFileExists = true;  //验证路径有效性
            ofd.CheckPathExists = true; //验证文件有效性

            string strName = string.Empty;
            if (ofd.ShowDialog() == DialogResult.OK)
            {
                strName = ofd.FileName;
            }

            if (strName == "")
            {
                MessageBox.Show("没有选择Excel文件！无法进行数据导入");
                return;
            }
            //调用导入数据方法
            EcxelToDataGridView(strName, this.OutLookAll);

        }
        /// Excel数据导入方法
        public void EcxelToDataGridView(string filePath, DataGridView dgv)
        {
            //根据路径打开一个Excel文件并将数据填充到DataSet中

            string strConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source= " + filePath + "; Persist Security Info=False;";
            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");

            //根据DataGridView的列构造一个新的DataTable
            DataTable tb = new DataTable();
            foreach (DataGridViewColumn dgvc in dgv.Columns)
            {
                if (dgvc.Visible && dgvc.CellType != typeof(DataGridViewCheckBoxCell))
                {
                    DataColumn dc = new DataColumn();
                    dc.ColumnName = dgvc.DataPropertyName;
                    //dc.DataType = dgvc.ValueType;//若需要限制导入时的数据类型则取消注释，前提是DataGridView必须先绑定一个数据源那怕是空的DataTable
                    tb.Columns.Add(dc);
                }
            }

            //根据Excel的行逐一对上面构造的DataTable的列进行赋值
            foreach (DataRow excelRow in ds.Tables[0].Rows)
            {
                int i = 0;
                DataRow dr = tb.NewRow();
                foreach (DataColumn dc in tb.Columns)
                {
                    dr[dc] = excelRow[i];
                    i++;
                }
                tb.Rows.Add(dr);
            }
            //在DataGridView中显示导入的数据
            dgv.DataSource = tb;
        }

    }

     conn.Open();这步报错请各位大哥帮我看下

--------------------编程问答-------------------- Provider= Microsoft.Ace.OleDB.12.0;Data Source=c:\a.xlsx;Extended Properties=Excel 12.0;
加try catch
ofd.Filter = "Excel文件(*.xlsx)|*.xlsx";

补充：.NET技术 ,  C#