C#

class Dog
{
    public virtual void DoTrick()
    {
         // Does nothing!
    }
}

public class Doberman
{
    public override void DoTrick()
    {
        // do a trick that only dobermans can do!
        ...
    }
} 

protected override void OnPaint(PaintEventArgs e)<br />
		{<br />
			base.OnPaint(e);<br />
			e.Graphics.DrawImage(this.splashImage, 0, 0, this.Width, this.Height);<br />
		}<br />

public T loadObject<t>(Type TypeToLoad)
{
    T RetVal = (T)TypeToLoad.GetConstructor(null).Invoke(null);
    return RetVal;
}
</t>

myInterface Obj = loadObject<myinterface>(typeof(SomeType));<br />
<br />
2) with reflection<br />
<br />
<pre><br />
public object loadObject(Type TypeToLoad, Type Interface)<br />
{<br />
    Type[] ifs = TypeToLoad.GetInterfaces();<br />
    if (Array.IndexOf(ifs, Interface) == -1)<br />
    {<br />
        throw new Exception("It didn't work!");<br />
    }<br />
    return TypeToLoad.GetConstructor(null).Invoke(null);<br />
}<br />
</pre><br />
<br />
this will work with 1.1 (if you still use that one..) and it will fail *before* the instance is created. but you will have to cast the return - value to your interface type:<br />
<code>myInterface Obj = loadObject(typeof(SomeType), typeof(myInterface)) as myInterface;

FormCommon newForm=null;
if (strReportName == PRICEHISTORY) newForm=new frmHistoryDetails();
else if (strReportName == PRICEHISTORYBEST) newForm=new fmrHistory();
if (newForm!=null) {
    newForm.ReportNameGet(strReportName.ToLower());
    newForm.SecurityID = intSecurityID;// Provide the SecurityID to the new form. 
    newForm.ShowDialog();// Show the form.
    newForm.Dispose();
}