線を引くには？ (ID:69591)

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みなさん、貴重なご意見、ありがとうございました。

以下のようにグラフ表示ボタンを押下すると、GraphShowウィンドウが表示され、そこに線を引きたいのですが、エラーとなってしまいます。

何が原因なのでしょうか？

ご教示よろしくお願い致します。

#pragma once

namespace test000000 {
	using namespace System;
	using namespace System::ComponentModel;
	using namespace System::Collections;
	using namespace System::Windows::Forms;
	using namespace System::Data;
	using namespace System::Drawing;

public ref class Form1 : public System::Windows::Forms::Form
	{

private: System::Windows::Forms::Button^  ButtonGraph;

public:
		Form1(void)
		{
			InitializeComponent();
		}

protected:
		~Form1()
		{
			if (components)
			{
				delete components;
			}
		}
	private: System::Windows::Forms::Button^  button1;
	protected:

private:
		System::ComponentModel::Container ^components;

#pragma region Windows Form Designer generated code
		void InitializeComponent(void)
		{
			this->button1 = (gcnew System::Windows::Forms::Button());
			this->SuspendLayout();
			// button1
			this->button1->Location = System::Drawing::Point(98, 100);
			this->button1->Name = L"button1";
			this->button1->Size = System::Drawing::Size(75, 23);
			this->button1->TabIndex = 0;
			this->button1->Text = L"グラフ表示";
			this->button1->UseVisualStyleBackColor = true;
			this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click);
			// Form1
			this->AutoScaleDimensions = System::Drawing::SizeF(6, 12);
			this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
			this->ClientSize = System::Drawing::Size(292, 266);
			this->Controls->Add(this->button1);
			this->Name = L"Form1";
			this->Text = L"Form1";
			this->ResumeLayout(false);

}
#pragma endregion
	
	//グラフ表示ボタン押下
	private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
		System::Windows::Forms::Form^ Form2 = gcnew Form;
		
		ButtonGraph = gcnew System::Windows::Forms::Button();
		ButtonGraph->Parent = Form2;
		ButtonGraph->Width = 50;
		ButtonGraph->Location = System::Drawing::Point(230, 54);
		ButtonGraph->Name = L"ButtonGraph";
		ButtonGraph->Size = System::Drawing::Size(50, 23);
		ButtonGraph->Text = L"グラフ表示";
		ButtonGraph->UseVisualStyleBackColor = true;
		ButtonGraph->Click += gcnew System::EventHandler(this, &Form1::ButtonGraph_Click);

Form2->ShowIcon = false;
		Form2->MinimizeBox = false;
		Form2->MaximizeBox = false;

Form2->Text = L"GrapthShow";
		Form2->Width = 200;
		Form2->Height = 200;
		Form2->MinimumSize = System::Drawing::Size(200,200);
		Form2->MaximumSize = System::Drawing::Size(200,200);

Form2->StartPosition = System::Windows::Forms::FormStartPosition::CenterScreen;
		Form2->Activate();
		Form2->Show();
		Form2->Refresh();
	}

private: System::Void ButtonGraph_Click(System::Object^  sender, System::EventArgs^  e) {
	System::Drawing::Pen^ redPen = gcnew Pen( Color::Red );
	System::Drawing::Graphics::DrawLine(redPen,10,10,100,100);
}

};
}

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