WebClient

Hi,
I am upload a file with System.Net.WebClient webClient = new System.Net.WebClient()... My server side is php. At server side, server process file which i uploaded file. And it can be take long time.And i use set_time_limit(0) for php and there's no problem. But at my desktop application raise timeout error. How can i set timeout value to webclient.
           
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System.Net.WebClient webClient = new System.Net.WebClient();
 
//here is raise timeout exception.i have to set timeout.
byte[] responseArray = webClient.UploadFile(myWebAddress, file);
 
string resultXML = Encoding.ASCII.GetString(responseArray);