Using Shared Code in ASP.NET and C#

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Using Shared Code in ASP.NET and C#

ASP.NET Performance Tutorial

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:

<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>

</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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