C#

<br />
    String sFontSize = context.Request.Params.Get("FontSize"); //= "120pt"<br />
    // 1<br />
    int iFontSize = Convert.ToInt32(sFontSize); //=0<br />
    // 2<br />
    float iFontSize = float.Parse(sFontSize); //=FormatException-Error<br />
    // 3<br />
    float iFontSize;<br />
    if (float.TryParse(sFontSize, out iFontSize)) //=false<br />
    // 4<br />
    FontUnitConverter fuc = new FontUnitConverter();<br />
    FontUnit fu= FontUnit.Parse(sFontSize);<br />
    float flt = (float)fuc.ConvertTo(fu, typeof(float)); //=Error<br />
<br />
    // float-value is needed to build font:<br />
    Font fFont = new Font(sFontName, iFontSize);<br />

class A<T>
{
    public void Save()
    {
         IInterface interface = (IInterface)new InterfaceImpl();
         interface.Save((T)this);
    }
}

class Derived : A<Derived>
{
}

class InterfaceImpl : IInterface<Derived>
{
     //This is interface method implementation
     public void Save(Derived instance)
     {
     }
}