how to use oprators

Question

Hello Sir, I am Tarmac and I'm working in one application about operators but I'm suffering to make a differente between < and >. this is my problem:

if the date who's affected in  the textbox zone is < that the date who's in the recordset  or the date.textbox is > that the date in recordset then a msgbox
{
}

if somebody type three time is password then the programme can be close. is name in french is boucle

and

how to use class, how to create it and to affect it in my page.

please I'am a new comer in Asp.net, before I was working with Visual basic 6.0 and it's was so good but it's change with C# visual studio 2010. please help me. all these, I know it in visual basic 6.0.