c# - Simconnect data reading in multiple .xaml files -


i using simconnect read data prepar3d in wpf. read data in 1 .xaml file ok. in project, mainwindow consists of many .xaml files means need multiple .xaml files read data @ same time. when try read data simultaneously in 2 .xaml files, created new simconnect object, struct defined unsuccessful. 

    internal struct simobjectgeneral      {         [marshalas(unmanagedtype.byvaltstr, sizeconst = 256)]          /* 2.declare parameters in simobjectgeneral */         public string title;          public int32 ias;         public int32 cas;         public int32 grossweight;         ... ...     }       internal struct simobjectgeneral_atcl     {         [marshalas(unmanagedtype.byvaltstr, sizeconst = 256)]          /* 2.declare parameters in simobjectgeneral */         public int32 altitude;     }  simobjectgeneral? simobjectgeneral= data.dwdata[0] simobjectgeneral_?;//it works  simobjectgeneral_atcl? simobjectgeneral_atcl = data.dwdata[0] simobjectgeneral_atcl?;//it returns null value, why?

i confused this. help!


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