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Wait load webpage until element is present

I am new to c# and its concepts, so i am sorry if this question is kind of dumb. 
I try to do some automatation using the winforms webbrowser control.

I'm looking for a method that loads a web page until a web item is found.
to wait for the web page to load, I use line "Wait(30)"
"Wait(30)" this is an obvious expectation and this is not optimal.

I just need a synchronous download:
Find web item if the web item is missing on the page then wait 1 second, if the web item is found finish downloading a web page.

What I have tried:

private void Wait(int number)
    DateTime time = DateTime.Now;
    while (time.AddSeconds(number) > DateTime.Now);

private void CheckFindElement1()
        var mlm = web_Browser.Document.GetElementById("id1");
    catch (Exception)
Updated 13-May-18 3:23am
Richard MacCutchan 13-May-18 9:08am
That is not the right way to do it. You should add event handlers that will receive an event notification when the page load completes.

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