Method loading data, the fastest technique

[Fabio Cirillo]

Hi,
I have a database sql server on the remote web server, there are some tables that contain thousands of data on which I have to do some research display.
My question is the following, for example, using a control radcombobox, which technique is faster to load and display the data?

1) SqlDataSource
2) Entity datasouce
3) Web Service?

thanks