.if uMsg == WM_DESTROY
    invoke PostQuitMessage, 0

.elseif uMsg == WM_CREATE

    //Create Buttoon for Addition

    invoke CreateWindowEx, NULL, addr ButtonClassName, addr ButtonAdd, WS_CHILD or WS_VISIBLE or BS_DEFPUSHBUTTON, 225, 10, 120, 30, hWnd, ButtonID, hInstance, NULL
    mov hButton, eax




    //Create 3 TextBox. First text box for 1st input, Second TextBox for 2nd input, 3rd TextBox to show the result from added First textBox and Second texbox value

    invoke CreateWindowEx, WS_EX_CLIENTEDGE, addr EditClassName, NULL, WS_CHILD or WS_VISIBLE, 10, 10, 120, 30, hWnd, EditID, hInstance, NULL
    mov hEdit, eax
    invoke CreateWindowEx, WS_EX_CLIENTEDGE, addr EditClassName, NULL, WS_CHILD or WS_VISIBLE, 10, 50, 120, 30, hWnd, EditID, hInstance, NULL
    mov hEdit, eax
    invoke CreateWindowEx, WS_EX_CLIENTEDGE, addr EditClassName, NULL, WS_CHILD or WS_VISIBLE, 10, 110, 120, 30, hWnd, EditID, hInstance, NULL
    mov hEdit, eax

.elseif uMsg == WM_COMMAND
    mov eax, wParam
        .if eax == ButtonID  // Here when add button add is click it will perform the add operation.
             shr eax, 16
            .if ax == BN_CLICKED
                    //code here to perform operations when click.

                .endif
        .endif

.else