ModuleNotFoundError: No module named 'CalcTestNS'

Question

I am trying to read a DLL file using pythonnet library. The DLL file was generated using .NET framework 5.0 using the simple code below.

using System;

namespace CalcProcess
{
    public class Calculate
    {
        public int Add(int a, int b)
        {
            return a + b;
        }

        public int Sub(int a, int b)
        {
            return a - b;
        }
    }
}

When trying to read object using the library as seen in the code below:

import sys

import clr

assembly_path = r"C:\Users\username\Source\Repos\CalcProcess\bin\Debug\net5.0"
sys.path.append(assembly_path)

#calling the dll file in the dll folder below
clr.AddReference("dll/CalcProcess")
from CalcProcess import Calculate

obj = Calculate()

print(obj.Add(1,2))

The line of code below gives the error in the topic below

from CalcProcess import calculate

Any idea why?