Creating ViewState-Enabled Control Properties (C#)

<%@ Page language="C#" %>
<%@ Register TagPrefix="Control" Namespace="Control" Assembly="Control" %>
<script language="C#" runat="server">
void Page_Load(object sender, EventArgs e)
{
  if (!IsPostBack)
  {
    Random rand = new Random();
    ViewStateControl1.Text = rand.Next(1,100).ToString();
  }
}
</script>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<html>
  <head>
    <title>Creating ViewState-Enabled Control Properties</title>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">
      <Control:ViewStateControl id="ViewStateControl1" runat="server" />
      <asp:linkbutton text="PostBack test" runat="server" />
    </form>
  </body>
</html>

File: Control.cs

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;

namespace Control
{
  [DefaultProperty("Text"), 
  ToolboxData("<{0}:ViewStateControl runat=server></{0}:ViewStateControl>")]
  public class ViewStateControl : System.Web.UI.WebControls.WebControl
  {
    public string Text 
    {
      get
      {
        string text = (string) ViewState["Text"];
        return (text == null)? string.Empty : text;
      }
      set
      {
        ViewState["Text"] = value;
      }
    }

    protected override void Render(HtmlTextWriter writer)
    {
      writer.Write(Text);
    }
  }
}

Related examples in the same category

1.	User control with readonly properties
2.	Creating ViewState-Enabled Control Properties (VB)

Creating ViewState-Enabled Control Properties (C#) : Property « User Control and Master Page « ASP.Net

Related examples in the same category