if i put the code for the wifi when i connect to this in my web browser i cannot see anything.the browser has a problem.
What kind of problem?
If i put another sensor works well.why?
Because you are reading the sensor correctly?
Without the wifi shield, are you able to read, and print to the serial monitor, good data from the temp sensor?
can you tell me if you know what do this code in my wifi session?
The first line sends the tempC value to the WiServer class, as a number (not as a string representation of a number). The 2nd and third lines close out some open tags in the html document and add some data to the page that is to be displayed in the browser.
Though, why you are trying to display the temperature followed by a % sign escapes me. As does the use of the DEC argument. Allowing the conversion of tempC to a string seems more reasonable to me.