C#

Form.ActiveForm.MyMethod();

String myString = "abc";
bool test1 = String.Compare(myString.Substring(2, 1), "c") == 0; // This is true.
myString.Substring(3, 1); // This throws ArgumentOutOfRangeException.
bool test2 = String.Compare(myString.Substring(3, 0), String.Empty) == 0; // This is true.

String myString = "abc";
int myInt = myString.IndexOf("c")

using System;
using System.Runtime.InteropServices;
 
public class ComUtils
{
    public static object GetObjectFromClass(string className)
    {
        object ret = Marshal.GetActiveObject(className);
        
        if (null == ret)
        {
            // NB: Not sure if this is needed,
            // but the GetActiveObject functions should
            // only return an existing object, not
            // create a new instance.
            Type t = Type.GetTypeFromProgID(className);
            ret = Activator.CreateInstance(t);
        }
        
        return ret;
    }
    
    public static object GetObject(string pathName)
    {
        return Marshal.BindToMoniker(pathName);
    }
    
    public static object GetObject(string pathName, string className)
    {
        if (null == pathName || 0 == pathName.Length)
        {
            return GetObjectFromClass(className);
        }
        else if (null == className || 0 == className.Length)
        {
            return Marshal.BindToMoniker(pathName);
        }
        else
        {
            // Class and path specified
            object ret = GetObjectFromClass(className);
            
            UCOMIPersistFile pf = (UCOMIPersistFile)ret;
            pf.Load(pathName, 0);
            
            return pf;
        }
    }
}