get output of fit curve in visual studio(.dll)

hi i am use matlab dll in visual studio and i can get result correctly but in my matlab code i use fit function and result are formula and p1,p2,... how can i get this variable in .net

my code f=fit(semivariogram.range',semivariogram.silt',type_fit);

result(my question is how get c parameter in .net)

    c = 

     Linear model Poly4:
     c(x) = p1*x^4 + p2*x^3 + p3*x^2 + p4*x + p5
     Coefficients (with 95% confidence bounds):
       p1 =   -4.14e-05  (-8.349e-05, 6.923e-07)
       p2 =    0.003655  (-0.0005761, 0.007886)
       p3 =     -0.1063  (-0.2505, 0.03796)
       p4 =       1.202  (-0.7036, 3.108)
       p5 =      -1.933  (-9.72, 5.853)

visual studio code

   Dim resualt() As Object = func.variogram1(3, addressfile, nn, ComboBox1.SelectedItem.ToString)

error visual studio

Object reference not set to an instance of an object.