How can I read&show image using .dll from C# ASP.NET Web app?

Hi I trying to run dll(generated from matlab library compiler in .NET Assembly) in C# ASP.NET Web application. It is supposed to read the image and show it's figure.

But if I click the button(made at WebForm) MWMCR::EvaluateFunction error shows up saying that the image file does not exist. The matlab function works well when I run it in matlab r2017a.

Does anyone know how to solve the problem?

This is the matlab code *******************

function showdisplay()
 path= 'C:\Users\VC\Pictures\penquin.jpg';
 image=imread(path);
 imshow(image);
end

*************

And C# code

 using MathWorks.MATLAB.NET.Arrays;
 using MathWorks.MATLAB.NET.Utility;
 using showdisplay;
 namespace WebApplication_Test
 {
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {

           ShowDis obj = new ShowDis();
           obj.showdisplay();

        }
    }
 }