ขอคำแนะนำ การ Import ไฟล์ Excellหรือ จาก text ลง Data base sql server 2008 ทีครับ

OleDbConnection objConn = new OleDbConnection();
OleDbDataAdapter dtAdapter = default(OleDbDataAdapter);
DataTable dt = new DataTable();

string strConnString = null;
strConnString = "Provider=Microsoft.Jet.OLEDB.4.0; " + "Data Source=" + Server.MapPath("MyXls/MyExcelDB.xls") + ";Extended Properties=Excel 8.0;";
objConn = new OleDbConnection(strConnString);
objConn.Open();

string strSQL = null;
strSQL = "SELECT * FROM [Sheet1$]";

dtAdapter = new OleDbDataAdapter(strSQL, objConn);
dtAdapter.Fill(dt);

//*** BindData To DataGrid ***'
this.myDataGrid.DataSource = dt;
this.myDataGrid.DataBind();

dtAdapter = null;

objConn.Close();
objConn = null;


string connetionString = null;
SqlConnection connection = default(SqlConnection);
SqlDataAdapter adapter = new SqlDataAdapter();
int i = 0;
string sql = null;
connetionString = "Data Source=ServerName;Initial Catalog=MyDatabase;User ID=UserName;Password=Password";
connection = new SqlConnection(connetionString);
connection.Open();

for (i = 0; i <= dt.Rows.Count - 1; i++) {
	sql = "insert into product (Product_id,Product_name,Product_price) values('" + dt.Rows[i][0] + "','" + dt.Rows[i][1] + "','" + dt.Rows[i][2] + "')";
	adapter.InsertCommand = new SqlCommand(sql, connection);
	adapter.InsertCommand.ExecuteNonQuery();
}
connection.Close();