Question

I am kinda new in web development, looking for secured way to update SQL Database from the client side, or in other description updating the database without refreshing the webpage like (like facebook button).
I searched a lot and found that it can be done by using a web service and call it by javascript or using javascript direct or ajax, but which is the best and secured way and there is any other way to do it ?
thanks..

Answer 1

you can use ajax for updating database from client side.. Like if you click a button in web page, get the click event of that page through JavaScript or jQuery then through ajax you can perform database update. See the code below:

For catching event(like my button id is button1):

$('#<%=button1.ClientID%>').click(function{ 
      $.ajax({
               type: "POST",
               url: "default.aspx/UpdateDatabase",
               data: "{'textboxvalue':'" + $('<%=textbox1.ClientID%>').val() + "'}'
               contentType: "application/json;charset=utf-8",
               datatype: "json",
               success: UpdateDone
             });
});

In above code you have passed one value from a textbox1 to function UpdateDatabse in Default.aspx page(Please defined this function as [WebMethod]). then do your update in this function and return some string or bool value so that you can judge that update is done then value in success is name of function that will run if your function runs successfully so define that function in JavaScript or jQuery like

    function UpdateDone(response)
    {
        if(response.d == 'done')
         { alert('Update is done');  }
        else
         { alert('Sorry Update not done'); }
    }

Above code will not do any postback you see that your value is updated in database. Please note that the function you make in C# page please mark it as WebMethod and it will be a static method, then only your JavaScript can find that function.

Hope this will resolve your problem.