How to Insert Datas in Microsoft Excel - Repost

string connstr ="Provider=Microsoft.Jet.Oledb.4.0;Data Source=C:\aaa.xls;Extended Properties=Excel 8.0"/>
        OleDbConnection conn = new OleDbConnection(connstr);
        string strSQL = "SELECT * FROM [Sheet$]";

        OleDbCommand cmd = new OleDbCommand(strSQL, conn);
        DataSet ds = new DataSet();
        OleDbDataAdapter da = new OleDbDataAdapter(cmd);
        da.Fill(ds);
        GridView1.DataSource = ds;
        GridView1.DataBind();