C#

<br />
public Form_1() : this(null)<br />
{<br />
//blah blah<br />
}<br />
public Form_1(string Name) : this(Name, 0)<br />
{<br />
}<br />
public Form_1(string Name, int Number)<br />
{<br />
}<br />

public Form1() : this(null, 0)
{
}
public Form1(string name) : this(name, 0)
{
}
public Form1(string name, int number)
{
  // Your implementation goes here.
}

private IFun GetFunObject(string strType)
{
    IFun iFun;
    if(string.Compare(strType, "SomeClassName") == 0)
    {
        // explicit cast
        iFun = (IFun) new Fun();
    }
    return iFun;
}
//....
interface IFun
{
   void HaveFun();
}
//....
class Fun : IFun
{
   void HaveFun()
   {
   //...
   }
}