string URL; URL = "OpenPage.apsx" ;//You New Page Response.Write("windows.open("+URL+");");////////////////////////////// I think it's should be OK.

If u don't hava a database,you can use xml to save the registed user's User Name & Pass word or other file which can instead of the database. Then------------- code in you *.cs files: page_Load( ...) { //UserName,UserPass pass by WEB UI.TextBox if ( !PostBack ) { string UserName = UName.Text.ToString(); string UserPass = UPass.Text.ToString(); if ( checkUser(UserName,UserPass) ) Page.Visible = true //for registed users else Page.Visible = false; } } ... public bool CheckUser(string UName,UPass) { //check the UserName,UserPassWord.... if { true } return true; else return false; }

sure ,you can use the "web control " code behind,you can see it in MSDN .

Yes, i think ASP.NET's RegularExpressionValidator is the best choose,it's a new feature in ASP.Net.