winforms identifiers are not visible-CodePudding

I have a button click event handler that draws a graph.

    System::Void Practform::MyForm::draw_Click(System::Object^ sender, System::EventArgs^ e)
     {
           . . .
    }

then I decided to put the drawing of the graph into a separate function, since I would have to call it for the timer.and I got the following.many indentifiers turned out to be undefined:

I tried to follow the VS prompts but it didn't help either

at the same time, I have defined at the beginning of the cpp file:

using namespace System;
using namespace System::Windows::Forms;

tell me, what should I do to make them visible again?What should I write?

CodePudding user response：

You are missing a reference to the System::Drawing assembly. Add

using namespace System::Drawing;

at the top of your program. System::Windows::Forms contains classes related to, well, forms and controls. System::Drawing contains class related to, well, drawing.