insert data into database using web services

This link[^] might help you.

You Need to create One WebMethod in WebService
which will interact to you DataBase

[WebMethod]
        public Void InsertItems(string FirstName)
        {
            try
            {

            }
            catch (Exception ex)
            {
            }
            finally
            {
            }
        }

after Creating Your Method you need to add the reference of it in your web application

Then you need to create an Object of that webservice
Like

  Webervice.MyWebservice Obj = new Webervice.MyWebservice()

          Obj.//Here You will get your Method that is 'InsertItems()'
and then you just need to pass your Parameters to that like 

 obj.InsertItems(txt_FirstName.text);

You could refer to any article in the web that discusses CRUD operations, i don't think there is a "recommended" way to do it in web services specifically. Check out the link below from MS -

http://www.asp.net/mvc/tutorials/create-a-movie-database-application-in-15-minutes-with-asp-net-mvc-cs[^]

So, for you, I feel the first step in doing what you intend would be to understand how you interact with the database. This article would certainly help you.

Hope this helps!

From webservice.cs you can perform Insert Operation. You can pass the value to webservice.cs by session or by parameter passing.