include header to Form.h

[Migeria]

here we go again.
For example, I have simple veiksmai.h

class veiksmai
{
public: int labas(int a) { return a;}
};

and I want to include it into Form2.h
here is example of whole useless code

#pragma once
#include "veiksmai.h"
namespace tager {

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

	/// <summary>
	/// Summary for Form2
	/// </summary>
	public ref class Form2 : public System::Windows::Forms::Form, public veiksmai   // INHERITANCE
	{
	public:
		Form2(void)
		{
			InitializeComponent();
			//
			//TODO: Add the constructor code here
			//
		}

	protected:
		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		~Form2()
		{
			if (components)
			{
				delete components;
			}
		}
	public: System::Windows::Forms::Label^  label1;
	private: System::Windows::Forms::Button^  button1;

	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->label1 = (gcnew System::Windows::Forms::Label());
			this->button1 = (gcnew System::Windows::Forms::Button());
			this->SuspendLayout();
			// 
			// label1
			// 
			this->label1->AutoSize = true;
			this->label1->Location = System::Drawing::Point(12, 31);
			this->label1->Name = L"label1";
			this->label1->Size = System::Drawing::Size(35, 13);
			this->label1->TabIndex = 0;
			this->label1->Text = L"label1";
                        // 
			// button1
			// 
			this->button1->Location = System::Drawing::Point(97, 50);
			this->button1->Name = L"button1";
			this->button1->Size = System::Drawing::Size(75, 23);
			this->button1->TabIndex = 2;
			this->button1->Text = L"Pridėti";
			this->button1->UseVisualStyleBackColor = true;
			this->button1->Click += gcnew System::EventHandler(this, &Form2::button1_Click);
			// 
			// Form2
			// 
			this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
			this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
			this->ClientSize = System::Drawing::Size(292, 127);
			this->Controls->Add(this->label1);
			this->Controls->Add(this->button1);
			this->Name = L"Form2";
			this->Text = L"Form2";
			this->ResumeLayout(false);
			this->PerformLayout();

		}
#pragma endregion
		
	private: System::Void Form2_Load(System::Object^  sender, System::EventArgs^  e) {
		}
		
veiksmai myobj;  // OBJECT
private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
                        label1->Text = myobj.labas(5);  // <<<<<< OVER HERE
                }
		
	};
}

So the event main question: is there any way to use labas() where I want to using it?

Updated according to 2nd post. + added inheritance to Form2 class

[like2codecpp]

you're problem appears to be the fact that labas() is in a class but you have not created an object, in order to use it you could try:

#include "veiksmai.h"
//all that code
veiksmai myobj;
private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
                        label1->Text = myobj.labas(5);  // <<<<<< OVER HERE
                }

hope this helps

[Migeria]

yeah.. I forgot object, but thats not it.
I have problem with inheritance.
'tager::Form2' : cannot inherit from 'veiksmai', a ref class can only inherit from a ref class or interface class