How To Move Camera in Tao Opengl Framework in C# (WFA)? -

i'm trying make class control camera in opengl in c# using tao framework class including

• -moving camera , down , right , left
• -rotate camera
• -apply of transformation main camera

every thing work when apply transformation main camera nothing work

this class

using system; using system.collections.generic; using system.drawing; using system.linq; using system.text; using system.threading.tasks; using tao.opengl; using tao.sdl; using visualization; using mathnet.numerics.linearalgebra; using mathnet.numerics.linearalgebra.double; using mathnet.spatial.euclidean;  namespace visualiation_assignment_2 {     class cameracontroller {      public vector3d cameraposition;      public vector3d cameraup;     public vector3d cameraright;     public vector3d cameradirection;     public vector3d camerlook;      public double prespectivangle;     public double znear, zfar;     public double aspectratio;      public cameracontroller()     {         gl.glenable(gl.gl_depth_test);         gl.gldepthfunc(gl.gl_less);      }     public void movefront(double distance)     {         cameraposition -= distance * cameradirection;     }     public void moveright(double distance)     {         cameraposition += distance * cameraright;     }     public void moveup(double distance)     {         cameraposition += distance * cameraup;     }     public void yaw(double angledegree)     {         mathnet.spatial.units.angle theangel = new mathnet.spatial.units.angle(angledegree, mathnet.spatial.units.angleunit.degrees);         cameradirection = cameradirection.rotate(cameraup, theangel);         cameraright = cameraright.rotate(cameraup, theangel);     }     public void pitch(double angledegree)     {         mathnet.spatial.units.angle theangel = new mathnet.spatial.units.angle(angledegree, mathnet.spatial.units.angleunit.degrees);         cameraup = cameraup.rotate(cameraright, theangel);         cameradirection = cameradirection.rotate(cameraright , theangel);     }     public void roll(double angledegree)     {         mathnet.spatial.units.angle theangel = new mathnet.spatial.units.angle(angledegree, mathnet.spatial.units.angleunit.degrees);         cameraright = cameraright.rotate(cameradirection, theangel);         cameraup = cameraup.rotate(cameraposition, theangel);      }     public void updateview()     {         gl.glpushmatrix();         gl.glmatrixmode(gl.gl_projection);         gl.glloadidentity();         glu.gluperspective(prespectivangle , aspectratio , znear , zfar);         gl.glmatrixmode(gl.gl_modelview);         gl.glloadidentity();         glu.glulookat(cameraposition.x , cameraposition.y , cameraposition.z , camerlook.x , camerlook.y , camerlook.z , cameraup.x , cameraup.y , cameraup.z);     }  } 

}

any ?? in advance