C# + Webpage, questions

[C# Programming]

I’m currently starting to work on internet apps, what i want to know is the "name" of such methods & what web hosting services i need.

Basically i want know how it’s called to do app communications using a webpage has the way to link them & start transmitting data.

Any examples or guides will be much appreciated 2 http://www.barakasoft.com/script/Forums/Images/smiley_smile.gif