MouseStateMoveCamera

 if (MouseState.IsButtonDown(MouseButton.Right))
            {
                CursorState = CursorState.Grabbed;

                var input = KeyboardState;

                const float cameraSpeed = 1.5f;
                const float sensitivity = 0.2f;

                if (input.IsKeyDown(Keys.W))
                {
                    _camera.Position += _camera.Front * cameraSpeed * (float)e.Time; // Forward
                }

                if (input.IsKeyDown(Keys.S))
                {
                    _camera.Position -= _camera.Front * cameraSpeed * (float)e.Time; // Backwards
                }
                if (input.IsKeyDown(Keys.A))
                {
                    _camera.Position -= _camera.Right * cameraSpeed * (float)e.Time; // Left
                }
                if (input.IsKeyDown(Keys.D))
                {
                    _camera.Position += _camera.Right * cameraSpeed * (float)e.Time; // Right
                }
                if (input.IsKeyDown(Keys.Space))
                {
                    _camera.Position += _camera.Up * cameraSpeed * (float)e.Time; // Up
                }
                if (input.IsKeyDown(Keys.LeftShift))
                {
                    _camera.Position -= _camera.Up * cameraSpeed * (float)e.Time; // Down
                }

                // Get the mouse state
                var mouse = MouseState;

                if (_firstMove) // This bool variable is initially set to true.
                {
                    _lastPos = new Vector2(mouse.X, mouse.Y);
                    _firstMove = false;
                }
                else
                {
                    // Calculate the offset of the mouse position
                    var deltaX = mouse.X - _lastPos.X;
                    var deltaY = mouse.Y - _lastPos.Y;
                    _lastPos = new Vector2(mouse.X, mouse.Y);

                    // Apply the camera pitch and yaw (we clamp the pitch in the camera class)
                    _camera.Yaw += deltaX * sensitivity;
                    _camera.Pitch -= deltaY * sensitivity; // Reversed since y-coordinates range from bottom to top
                }
            }
            else
            {
                CursorState = CursorState.Normal;
            } if (MouseState.IsButtonDown(MouseButton.Right))
            {
                CursorState = CursorState.Grabbed;

                var input = KeyboardState;

                const float cameraSpeed = 1.5f;
                const float sensitivity = 0.2f;

                if (input.IsKeyDown(Keys.W))
                {
                    _camera.Position += _camera.Front * cameraSpeed * (float)e.Time; // Forward
                }

                if (input.IsKeyDown(Keys.S))
                {
                    _camera.Position -= _camera.Front * cameraSpeed * (float)e.Time; // Backwards
                }
                if (input.IsKeyDown(Keys.A))
                {
                    _camera.Position -= _camera.Right * cameraSpeed * (float)e.Time; // Left
                }
                if (input.IsKeyDown(Keys.D))
                {
                    _camera.Position += _camera.Right * cameraSpeed * (float)e.Time; // Right
                }
                if (input.IsKeyDown(Keys.Space))
                {
                    _camera.Position += _camera.Up * cameraSpeed * (float)e.Time; // Up
                }
                if (input.IsKeyDown(Keys.LeftShift))
                {
                    _camera.Position -= _camera.Up * cameraSpeed * (float)e.Time; // Down
                }

                // Get the mouse state
                var mouse = MouseState;

                if (_firstMove) // This bool variable is initially set to true.
                {
                    _lastPos = new Vector2(mouse.X, mouse.Y);
                    _firstMove = false;
                }
                else
                {
                    // Calculate the offset of the mouse position
                    var deltaX = mouse.X - _lastPos.X;
                    var deltaY = mouse.Y - _lastPos.Y;
                    _lastPos = new Vector2(mouse.X, mouse.Y);

                    // Apply the camera pitch and yaw (we clamp the pitch in the camera class)
                    _camera.Yaw += deltaX * sensitivity;
                    _camera.Pitch -= deltaY * sensitivity; // Reversed since y-coordinates range from bottom to top
                }
            }
            else
            {
                CursorState = CursorState.Normal;
            }