Image enhance in C++ CLR winforms (.NET framework) using opencv library

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C++

WinForms

CLR

OpenCV

i have created CLR winforms(.net framework) c++ project, there's two buttons SelectImageBtn and EnhanceBn.
i want to select the folder where the blur images are stored by clicking SelectImageBtn and want to sharp and enhance all the blur images and save the new folder of enhanced images.
i have tried something but getting errors and i don't know weather it will work or not !!

getting error: E0725 name must be a namespace name, on line :

using namespace filesystem;

and error : E0276 name followed by '::' must be a class or namespace name, on line :

for (const auto& file : filesystem::directory_iterator(folderPath))

note : i am newbie to C++, so don't know much about c++
look out the code is i am going right or wrong ? suggestions will be appreciated and thanks in advance!!!

What I have tried:

#include <filesystem>
#include <exception>
#include <opencv2/opencv.hpp>
#include <msclr/marshal_cppstd.h>
#include <string>



namespace ImageEnhancer {

	using namespace System;
	using namespace System::ComponentModel;
	using namespace System::Collections;
	using namespace System::Windows::Forms;
	using namespace System::Data;
	using namespace System::Drawing;
	using namespace System::IO;
	using namespace System::Drawing::Imaging;
	using namespace cv;
	using namespace std;
	using namespace filesystem;


	/// <summary>
	/// Summary for MyForm
	/// </summary>
	public ref class MyForm : public System::Windows::Forms::Form
	{
	public:
		MyForm(void)
		{
			InitializeComponent();
			//
			//TODO: Add the constructor code here
			//
		}

	protected:
		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		~MyForm()
		{
			if (components)
			{
				delete components;
			}
		}
	FolderBrowserDialog^ dialog = gcnew FolderBrowserDialog;
	private: System::Windows::Forms::Button^ SelectImageBtn;
	private: System::Windows::Forms::Button^ EnhanceBn;
	protected:

	protected:

	protected:

	protected:


	private:
		/// <summary>
		/// Required designer variable.
		/// </summary>
		System::ComponentModel::Container^ components;

#pragma region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		void InitializeComponent(void)
		{
			this->SelectImageBtn = (gcnew System::Windows::Forms::Button());
			this->EnhanceBn = (gcnew System::Windows::Forms::Button());
			this->SuspendLayout();
			// 
			// SelectImageBtn
			// 
			this->SelectImageBtn->Location = System::Drawing::Point(134, 152);
			this->SelectImageBtn->Name = L"SelectImageBtn";
			this->SelectImageBtn->Size = System::Drawing::Size(75, 45);
			this->SelectImageBtn->TabIndex = 0;
			this->SelectImageBtn->Text = L"Select";
			this->SelectImageBtn->UseVisualStyleBackColor = true;
			this->SelectImageBtn->Click += gcnew System::EventHandler(this, &MyForm::SelectImageBtn_Click);
			// 
			// EnhanceBn
			// 
			this->EnhanceBn->Location = System::Drawing::Point(277, 152);
			this->EnhanceBn->Name = L"EnhanceBn";
			this->EnhanceBn->Size = System::Drawing::Size(75, 45);
			this->EnhanceBn->TabIndex = 1;
			this->EnhanceBn->Text = L"Enhance";
			this->EnhanceBn->UseVisualStyleBackColor = true;
			this->EnhanceBn->Click += gcnew System::EventHandler(this, &MyForm::EnhanceBn_Click);
			// 
			// MyForm
			// 
			this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
			this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
			this->ClientSize = System::Drawing::Size(522, 393);
			this->Controls->Add(this->EnhanceBn);
			this->Controls->Add(this->SelectImageBtn);
			this->Name = L"MyForm";
			this->Text = L"ImageEnhancer";
			this->ResumeLayout(false);

		}
#pragma endregion

		// Function to enhance a single image
		void enhanceImage(Mat& inputImage, Mat& outputImage)
		{
			// Code to enhance image using OpenCV functions goes here
			// For example, sharpening the image:
			Mat kernel = (Mat_<float>(3, 3) << 0, -1, 0, -1, 5, -1, 0, -1, 0);
			filter2D(inputImage, outputImage, -1, kernel);
		}

	private: System::Void SelectImageBtn_Click(System::Object^ sender, System::EventArgs^ e)
	{
		try
		{
			MessageBox::Show("clicked");
			// Create FolderBrowserDialog to select folder
			
			dialog->ShowDialog();

			// Store selected folder path
			string folderPath = msclr::interop::marshal_as<string>(dialog->SelectedPath);

		}
		catch (const std::exception& exx)
		{
			
		}
	}
	private: System::Void EnhanceBn_Click(System::Object^ sender, System::EventArgs^ e)
	{
		string folderPath = msclr::interop::marshal_as<string>(dialog->SelectedPath);
		
		// Loop through all files in the selected folder
		for (const auto& file : filesystem::directory_iterator(folderPath))
		{
			// Load image using OpenCV
			Mat inputImage = imread(file.path().string());

			// Create output image
			Mat outputImage;

			// Enhance image
			enhanceImage(inputImage, outputImage);

			// Save enhanced image to new folder
			string outputPath = "output/" + file.path().filename().string();
			imwrite(outputPath, outputImage);
		}

	}
		  

	};
}