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I have a C# project which is using a C++ dll. (in visual studio 2010) I have to pass a array of int from C# code to C++ function and C++ function will add few elements in array, when control comes back to C# code, C# code will also add elements in same array. Initially i declared a array(of size 10000) in C# code and C++ code is able to add elements (because it was just an array of int, memory allocation is same), but the problems is i have got run time error due to accessing out side of array. I can increase size to 100000 but again i don't know how much elements C++ code will add( even it can be just 1 element). So is there a common data structure (dynamic array) exist for both or other way to do? I am using Visual studio 2010. Something like this i want to do. PS: not compiled code, and here i used char array instead of int array. C# code [DllImport("example1.dll")] private static extern int fnCPP (StringBuilder a,int size) ... private void fnCSHARP(){ StringBuilder buff = new StringBuilder(10000); int size=0; size = fnCPP (buff,size); int x = someCSHARP_fu(); for ( int i=size; i < x+size; i++) buff[i]='x';// possibility of run time error } C++ code int fnCPP (char *a,int size){ int x = someOtherCpp_Function(); for( int i=size; i < x+size ; i++) a[ i ] = 'x'; //possibility of run time error return size+x; }

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