Compile time errors while working with C++/CLI examples

Question

I am trying to read a string which is a 'Number' from a file, and convert it back to an integer. Following is my code, which is C++/CLI

int InformationReader::getThreshold()
{
    StreamReader ^reader = gcnew StreamReader("threshold.dat");
    System::String ^thresholdStr = reader->ReadLine();

    Int32 thresholdNum;

    boolean a = Int32::TryParse(thresholdStr,thresholdNum);

    return 0;

}

But, as soon as this code get executed, I get the following error

1>InformationReader.cpp(29): error C2065: 'Int32' : undeclared identifier
1>InformationReader.cpp(29): error C2146: syntax error : missing ';' before identifier 'thresholdNum'
1>InformationReader.cpp(29): error C2065: 'thresholdNum' : undeclared identifier
1>InformationReader.cpp(31): error C2065: 'boolean' : undeclared identifier
1>InformationReader.cpp(31): error C2146: syntax error : missing ';' before identifier 'a'
1>InformationReader.cpp(31): error C2065: 'a' : undeclared identifier
1>InformationReader.cpp(31): error C2653: 'Int32' : is not a class or namespace name
1>InformationReader.cpp(31): error C2065: 'thresholdNum' : undeclared identifier
1>InformationReader.cpp(31): error C3861: 'TryParse': identifier not found

OK now this is alien to me, because I went through number of questions and answers, and in all of them they have followed the similar approach as I have used but I am getting an error. Why is this?

Answer 1

Fix the first compilation error you see: You need a System:: in front of the Int32 thresholdNum;