i have a c2065 undeclared identifier error although i declared it

Question

include "RegisterForm.h"

using namespace CppWinFormApp4; //name of project
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private: System::Void button4_Click(System::Object^ sender, System::EventArgs^ e) {
RegisterForm ^ reg = gcnew RegisterForm;
reg->Show();

}
When I do that I get error c2065 saying i have an undeclared identifier

Answer 1

Perhaps it is complaining about Show and not reg? Go to definition on RegisterForm and make sure it has a Show method that accepts no arguments. Also make sure this is the only error in your code. If there are other errors then resolve them first.