c# - Cannot convert from method group to System.Func<string> -

i'm playing bit .net 4.0 task class download google webpage in background using thread. problem if function has 1 or more parameters, application won't compile (idk how pass parameter). wonder how can pass function's parameter in dowork() method.

this works:

    public task<string> dowork() {         //create task, of runs our work of thread pool thread         return task.factory.startnew<string>(this.downloadstring);      }       private string downloadstring()     {         using (var wc = new webclient())             return wc.downloadstring("http://www.google.com");     } 

this doesn't:

    public task<string> dowork() {         //create task, of runs our work of thread pool thread         return task.factory.startnew<string>(this.downloadstring);      }       private string downloadstring(string uri)     {         using (var wc = new webclient())             return wc.downloadstring(uri);     } 

the error is:

cannot convert 'method group' 'system.func<string>' 

thank in advance!

return task.factory.startnew(() => this.downloadstring("http://...."));