How to convert std::string to System::String^ ?

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C++/CLI

hi,

i was trying to read the text/string from an ini file and i want to put it in textBox1->Text
i did some research and tried these

void MarshalString ( System::String^ s, std::string& os )
{   
using namespace System::Runtime::InteropServices;   
const char* chars = (const char*)(Marshal::StringToHGlobalAnsi(s)).ToPointer();   
os = chars;   
Marshal::FreeHGlobal(IntPtr((void*)chars));
}

button1:

.....
string std_string = pt.get<std::string>("Section1.Value1");
String^ str = "";
				 
MarshalString(str, std_string);
textBox1->Text = str;

but it gives me this error:

Additional information: External component has thrown an exception.

any better ways to do it? thank you in advance