c# - FileNotFoundException occurs only when running outside the debugger -

i have simple code opens txt file:

streamreader sourcefile = file.opentext(filename)

the thing is, when press ctrl-f5 start program, file doesn't exist error. when press f11 go step step, runs smooth , no errors or ever happens , desired results. idea cause of this?

i'm using visual studio c# express 2010.

the code in program.cs:

class1.readpointsfile(@"points.txt");

the function:

public void readpointsfile(string filename)         {             if (!file.exists(filename))             {                 console.writeline("file doesn't exist.");                 return;             }             using (streamreader sourcefile = file.opentext(filename))             {                 string inputline;                 int arraysize;                 arraysize = convert.toint32(sourcefile.readline());                 pointsarray = new point2d[arraysize];                 int i_keeptrack = 0;                 inputline = sourcefile.readline();                                 {                     string[] coordinations = inputline.split(' ');                     pointsarray[i_keeptrack] = new point2d(double.parse(coordinations[0]), double.parse(coordinations[1]));                     i_keeptrack++;                     inputline = sourcefile.readline();                 } while (inputline != null);             }         } 

that's problem of running path: debugging, start program on bin\debug folder (where file present), meanwhile using ctrl+f5 run without debug, program starts on bin\release folder.