wpf - setting URL as mediaElement source -


i keep getting "object reference not set instance of object" , have absolutely no idea why! 

mediaelement1.source = new uri(trackstream(0), urikind.absolute)

if mouseover check seems fine, variable position contains direct link mp3, says if mouseover source has been set url error.

i trying set url first in list have downloaded textfile previously, put array. have tried changing urlkind , omitting it.

this works:

 public mainwindow()     {         string[] trackstream = new string[] { @"c:\users\public\music\sample music\sound.wma" };          initializecomponent();         media.source = new uri(trackstream[0], urikind.absolute);      }

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