[CODE]
Code:
namespace ClassLibraryB
{
    public class Class1
    {
        public int result { get; set; }
        public static int i { get; set; }
        public static int j { get; set; }
        public void Add(int ii, int jj)
        {
            i = ii;
            j = jj;
            result = i + j;
        }
        public void Add2()
        {
            result =  i + j;
        }
    }
}
This gets called statically and gives me an answer
Code:
            ClassLibraryB.Class1 objB = new ClassLibraryB.Class1();
            objB.Add(4, 16);
            objB.Add2();
            kk = objB.result;
            textBox1.Text += "Addition =" + kk.ToString() + "\r\n";
However when I try to call the dll using below it fails with since it is not static

Code:
            Assembly testAssembly = Assembly.LoadFile(strDLL);
            Type calcType = testAssembly.GetType("ClassLibraryB.Class1");
            object calcInstance = Activator.CreateInstance(calcType);
            PropertyInfo numberPropertyInfo = calcType.GetProperty("i");
            numberPropertyInfo.SetValue(calcInstance, 5, null);
            PropertyInfo numberPropertyInfo2 = calcType.GetProperty("j");
            numberPropertyInfo2.SetValue(calcInstance, 15, null);
            int value2 = (int)numberPropertyInfo.GetValue(calcInstance, null);
            int value3 = (int)numberPropertyInfo2.GetValue(calcInstance, null);
            calcType.InvokeMember("Add2",BindingFlags.InvokeMethod | BindingFlags.Instance | BindingFlags.Public,
                null, null, null);
            PropertyInfo numberPropertyInfo3 = calcType.GetProperty("result");
            int value4 = (int)numberPropertyInfo3.GetValue(calcInstance, null);

it does not like calling Add2 as a non static.
Non-static method requires a target.

Any ideas to be able to call the same dll func from both static and dynamic way?

Thanks