I need an explanation about spire pdf viewer

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C++

WinForms

I'm not an expert, more precisely I'm learning C++. Can someone can help me with the code, I wrote the code but I get the error:

"no instance of constructor "Spire::Pdf::Graphics::PdfSolidBrush::PdfSolidBrush" matches the argument leaf"
'Spire::Pdf::Graphics::PdfSolidBrush::PdfSolidBrush(Spire::Pdf::Graphics::PdfRGBColor)': cannot convert argument 1 from 'Spire::Pdf::Graphics::PdfRGBColor ^' to 'Spire::Pdf::Graphics::PdfRGBColor ^' :Pdf::Graphics::PdfRGBColor'"

The next question is, how to display the document in spire pdfviwer without saving

What I have tried:

private: System::Void button1_Click
     (System::Object^ sender, System::EventArgs^ e) {
		PdfDocument^ doc = gcnew PdfDocument;
		PdfPageBase^ page = doc->Pages->Add();
		Spire::Pdf::Graphics::PdfFontBase^ font = 
          gcnew Spire::Pdf::Graphics::PdfFont
          (Spire::Pdf::Graphics::PdfFontFamily::Helvetica, 15.0f);
		   Spire::Pdf::Graphics::PdfRGBColor^ color = gcnew 
           Spire::Pdf::Graphics::PdfRGBColor(0, 175, 178);
		   Spire::Pdf::Graphics::PdfSolidBrush^ brush = gcnew 
           Spire::Pdf::Graphics::PdfSolidBrush(color);
		   page->Canvas->DrawString
           (textBox3->Text, font, brush, 130.0f, 130.0f);
	}