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>&nbsp; <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />&nbsp;<br /> <asp:Label ID="Label2" runat="server" Text="Yout typed in: " Visible="False"></asp:Label> <asp:Label ID="Label1" runat="server"></asp:Label></div> </form>

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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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