c# - How can I use Delay method and await? -

i want sequence in program take break while before going ahead next operation. this:

string s = hd.text;  if (s.contains("php")||s.contains("echo")) {      hd.text = "this okay ?";     messagebox.show("its php ?","gus");  } 

i tried this:

if (s.contains("php")||s.contains("echo")) {    hd.text = "this php ?";    task.delay(timespan.fromseconds(10));    messagebox.show("its php ?","guss");  } 

but doesn't work. it's throwing exception below:

cannot find type system.resources.resourceset in module mscorlib.dll 

as servy saying, need await task this:

solution 1:

public async task do() {    if (s.contains("php")||s.contains("echo"))    {          hd.text = "this php ?";         await task.delay(timespan.fromseconds(10));         messagebox.show("its php ?","guss");     } } 

or wait task this.

solution 2:

public void do() {    if (s.contains("php")||s.contains("echo"))    {          hd.text = "this php ?";         task.delay(timespan.fromseconds(10)).wait();         messagebox.show("its php ?","guss");     } }