I would like to fill the text box from a grid view

OnRowCommand="Countrylist_RowCommand"

protected void Countrylist_RowCommand(object sender, GridViewCommandEventArgs e)//TO FETCH PARTICULAR RECORD SELECTED FROM GRID FOR EDIT
       {
           if (e.CommandName == "EditRow")
           {
               string strCode = (string)e.CommandArgument;
               txt_countryid.Text = strCode;
              con.Open;
               DataSet ds = new DataSet();
               OleDbDataReader reader = null;
               OleDbCommand cmd = new OleDbCommand();
               cmd = new OleDbCommand("select * from Country_master where CountryId=" + strCode + "", con);
               reader = cmd.ExecuteReader();
               while (reader.Read())
               {
                   txt_countrycode.Text = reader["CountryCode"].ToString();
                   txt_countryname.Text = reader["CountryName"].ToString();

               }
               con.Close();
           }
       }