C#

mshtml.HTMLHeadElementClass elDynHead = null;
                    foreach (IHTMLElement elcol in (IHTMLElementCollection)document.getElementsByTagName("HEAD"))
                    {
                        if (elcol.ToString() == "mshtml.HTMLHeadElementClass")
                        {
                            elDynHead = (mshtml.HTMLHeadElementClass)elcol;
                        }
                    }

Error :: System.InvalidCastException: Unable to cast COM object of type 'System.__ComObject' to class type 'mshtml.HTMLHeadElementClass'. COM components that enter the CLR and do not support IProvideClassInfo or that do not have any interop assembly registered will be wrapped in the __ComObject type. Instances of this type cannot be cast to any other class; however they can be cast to interfaces as long as the underlying COM component supports QueryInterface calls for the IID of the interface.
   at PAW_URL.clsURLMON.browser_DocumentComplete(Object pDisp, Object& URL) 

lock (currlock) {

      if (N[int1] > N[int2]) {
          temp = N[int1];
          N[int1] = N[int2];
          N[int2] = temp;
      }


       //showArray(N);

 }//end lock

<br />
CREATE PROCEDURE [dbo].[Proc_Scenario_GetMaxID]<br />
@MaxID as int OUTPUT<br />
as<br />
BEGIN<br />
    if((SELECT MAX(ID) FROM student) is not null)<br />
	begin<br />
		SET @MaxID = (SELECT MAX(ID) FROM student)<br />
	end	<br />
	else<br />
	Begin<br />
		SET @MaxID=1<br />
	END<br />
	return @MaxID<br />
END<br />