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Using Shared Code in ASP.NET and C#
This tutorial shows how we can create our own classes and use shared code between different pages on our website. C# version.
Visual Studio allows you to create classes in separate files to be used in multiple pages on your website.
Classes you create are stored in the App_Code folder and can be in any language you prefer. For this tutorial, we'll create a sample class:
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
/// <summary>
/// Summary description for TestClass1
/// </summary>
public class TestClass1
{
public TestClass1() { } private string testStringValue; public string testString {
get {
return testStringValue; } set {
testStringValue = value; } } |
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When called, the class can either store data or return data. We create a text box and a button to show how we can store data in a variable in a separate class, and then a label to show how we can retrieve that same data.
The ASPX page which is using the class function:
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" /> <br /> <asp:Label ID="Label2" runat="server" Text="Yout typed in: " Visible="False"></asp:Label> <asp:Label ID="Label1" runat="server"></asp:Label></div> |
The code-behind should look something like this:
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e) { } protected void Button1_Click(object sender, EventArgs e) {
TestClass1 tc = new TestClass1();
tc.testString = TextBox1.Text;
Label1.Text = tc.testString;
Label2.Visible = true; } |
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