c# - Extern class used by an ASP.NET page -
i'm newbie in using c# applied asp.net, ask of things patience.
first context: developed asp page takes validate username , password (as shown in first chunk of code. effects of question, doesn't matter characters in password box, it's irrelevant).
index.aspx
<html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="login" runat="server"> <div><table> <tr> <td>user</td> <td><asp:textbox id="user" runat="server"></asp:textbox></td> </tr> <tr> <td>password</td> <td><asp:textbox id="pass" runat="server"></asp:textbox></td> </tr> <tr> <td></td> <td><asp:button id="loginbutton" runat="server" text="login" onclick="loginbutton_click" /></td> </tr></table> </div> </form> </body> </html> then after clicking button "login", strings given in both textboxes being compared specific strings, , if both strings coincide, login successful (as shown in second chunk of code).
index.aspx.webdesigner.cs
using system; using system.collections.generic; using system.linq; using system.web; using system.web.ui; using system.web.ui.webcontrols; namespace webapplication7 { public partial class index : system.web.ui.page { protected void page_load(object sender, eventargs e) { } protected void loginboton_click(object sender, eventargs e) { string user = user.text; string password = pass.text; string uservalid = "carlos"; string passvalid = "236"; if((user.equals(uservalid)) && (password.equals(passvalid))) response.redirect("valid.aspx"); else response.redirect("invalid.aspx"); } } } let's suppose in moment i need create new class specifically validating login (i know can done java), , use page. necessary considering in case using index.aspx.webdesigner.cs? , if necessary, or don't have no choice use new class, how can create it?
creating classes in c# similar creating classes in modern, typed, oo programming language. first define class, , instantiate it. there many different ways re-create validation in question, here's one.
here class definition
public class validator { private const string username = "carlos"; private const string password = "236"; public bool validate(string user, string pass) { return (user == username && pass == password); } } to instantiate , use class in code (note use of ternary conditional operator instead of if/else, keeps code concise , readable)
protected void loginboton_click(object sender, eventargs e) { //instantiate class defined above var validator = new validator(); //find next page redirect var redirectto = validator.validate(user.text, pass.text) ? "valid.aspx" : "invalid.aspx"; //redirect user response.redirect(redirectto); } c# deep language gentle learning curve, may benefit finding tutorial or book on subject. there number of introductory tutorials microsoft may helpful.
another thing note, word extern keyword in c#, indicates managed code (i.e. code runs in clr) wants load , execute unmanaged code, (i.e. code runs natively).
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