c# 4.0 - WPF app launching twice error -

when press enter app twice quickly,the second launching crash. have find out reason in logs:

"the process cannot access file '..\filemanifest.xml' because being used process."

i have researched on many sites , answers how prevent app launching twice,not how allow app launching many time. of help.

how can allow app run twice without crash?

add app metod check file in use:

protected virtual bool isfilelocked(fileinfo file) {     filestream stream = null;      try     {         stream = file.open(filemode.open, fileaccess.readwrite, fileshare.none);     }     catch (ioexception)     {         //the file unavailable because is:         //still being written         //or being processed thread         //or not exist (has been processed)         return true;     }         {         if (stream != null)             stream.close();     }      //file not locked     return false; } 

and

    (int = 0; < 100; i++)             {                 if (isfilelocked(file))                 {                     //add want                     thread.sleep(1000);                 }                 else                 {                     //add want                     return;                 }             }