Use properties defined in custom control : Introduction « Custom Controls « ASP.NET Tutorial

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ASP.NET Tutorial » Custom Controls » Introduction 
14.1.4.Use properties defined in custom control
<%@ Page Language="VB" %>
<%@ Register TagPrefix="Java2sASP" Namespace="MyCustomControls" Assembly="CustomControls"%>

<script runat="server">
   sub Submit(Sender as Object, e as EventArgs)
      MyControl.Size = MyControl.Size + 1
   end sub
</script>

<html><body>
   <form runat=server>
      The custom control produces the following output:
   
      <Java2sASP:CustomControl2 id="MyControl" runat=server 
         Message="Hello world!"
         Size=/>
         
      <asp:Button runat="server"
         Text="Increase size!" 
         OnClick="Submit"/>
   </form>
</body></html>

////////

using System;
using System.Web;
using System.Web.UI;

namespace MyCustomControls {
   public class CustomControl2 : Control {
      public string Message {
         get {
            return ViewState["Message"].ToString();
         }
         set {
            ViewState["Message"= value;
         }
      }
      
      public int Size {
         get {
            return (int)ViewState["Size"];
         }
         set {
            ViewState["Size"= value;
         }
      }

      protected override void Render(HtmlTextWriter Output) {
         Output.Write("<font size=" this.Size + ">" this.Message + "</font>");
      }
   }

}

////////////////

Imports System
Imports System.Web
Imports System.Web.UI

Namespace MyCustomControls
   Public Class CustomControl2 : Inherits Control
      public property Message as string
         Get
            Message = ViewState("Message").ToString
         End Get
         Set
            ViewState("Message"= value
         End Set
      end property
      
      public property Size as integer
         Get
            Size = CType(ViewState("Size"), Integer)
         End Get
         Set
            ViewState("Size"= value
         End Set
      end property

      Protected Overrides Sub Render(Output as HtmlTextWriter)
         Output.Write("<font size=" & Me.Size & ">" & Me.Message & "</font>")
      End Sub
   End Class

End Namespace
14.1.Introduction
14.1.1.Differences between user controls and web pages
14.1.2.Page control with full qualified name(C#)
14.1.3.Get value from asp.net page control (VB.net)
14.1.4.Use properties defined in custom control
14.1.5.Page component with code behind (VB.net)
14.1.6.Exposing Properties from a User Control
14.1.7.Set the properties from user control programmatically.
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