AJAX Progress Bar for ASP.NET

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace hmlib.Web.UI.Controls
{
	public partial class ProgressBar
	{
		[Browsable(true)]
		[Category("Behavior")]
		[Description("Indicates Progress ID")]
		public string ProgressId
		{
			get
			{
				if (Attributes["ProgressId"] == null)
				{
					Attributes["ProgressId"] = Guid.NewGuid().ToString();
				}
				return (string)Attributes["ProgressId"];
			}
			set
			{
				Attributes["ProgressId"] = value.ToString();
			}
		}
		[Browsable(true)]
		[Category("Behavior")]
		[Description("Indicates the Url which providing service is located.")]
		[UrlProperty]
		public string ServicePath
		{
			get
			{
				object obj = Attributes["ServicePath"];
				if (obj == null) return Page.Request.Url.AbsolutePath;
				return (string)obj;
			}
			set { Attributes["ServicePath"] = value.ToString(); }
		}
		[Browsable(true)]
		[DefaultValue("getProgress")]
		[Category("Behavior")]
		[Description("Indicates Method Name returning progress status")]
		public string Service_GetMethod
		{
			get
			{
				object obj = Attributes["Service_GetMethod"];
				if (obj == null) return "getProgress";
				return (string)obj;
			}
			set { Attributes["Service_GetMethod"] = value.ToString(); }
		}
		//[Browsable(true)]
		//[DefaultValue("startProgress")]
		//[Category("Behavior")]
		//[Description("Indicates Method name starting the progress")]
		//public string Service_StartMethod
		//{
		//  get
		//  {
		//    object obj = Attributes["Service_StartMethod"];
		//    if (obj == null) return "startProgress";
		//    return (string)obj;
		//  }
		//  set { Attributes["Service_StartMethod"] = value.ToString(); }
		//}
		//[Browsable(true)]
		//[DefaultValue("stopProgress")]
		//[Category("Behavior")]
		//[Description("Indicates Method name starting the progress")]
		//public string Service_StopMethod
		//{
		//  get
		//  {
		//    object obj = Attributes["Service_StopMethod"];
		//    if (obj == null) return "stopProgress";
		//    return (string)obj;
		//  }
		//  set { Attributes["Service_StopMethod"] = value.ToString(); }
		//}
		[Browsable(true)]
		[DefaultValue(1000)]
		[Category("Behavior")]
		[Description("Indicates Interval in milliseconds")]
		public int Interval
		{
			get
			{
				if (Attributes["Interval"] == null)
				{
					Attributes["Interval"] = 1000.ToString();
				}
				return int.Parse(Attributes["Interval"]);
			}
			set
			{
				Attributes["Interval"] = value.ToString();
			}
		}
		[Browsable(true)]
		[Category("Appearance")]
		[Description("Indicates Progress Bar Color")]
		[DefaultValue(typeof(Color), "LightGreen")]
		public Color ProgressColor
		{
			get
			{
				object obj = ViewState["ProgressColor"];
				if (obj == null) obj = Color.LightGreen;
				return (Color)obj;
			}
			set
			{
				ViewState["ProgressColor"] = value;
			}
		}
		[Browsable(true)]
		[DefaultValue("")]
		[Category("Behavior")]
		[Description("Indicates the Message Target")]
		public string MessageTargetId
		{
			get
			{
				object obj = ViewState["MessageTargetId"];
				if (obj == null) return "";
				return (string)obj;
			}
			set { ViewState["MessageTargetId"] = value; }
		}
		[Browsable(true)]
		[Category("Behavior")]
		[Description("")]
		[DefaultValue("")]
		public string ProgressControlId
		{
			get
			{
				if (ViewState["ProgressControlId"] == null) return "";
				return (string)ViewState["ProgressControlId"];
			}
			set
			{
				ViewState["ProgressControlId"] = value;
			}
		}
		[Browsable(true)]
		[Category("Behavior")]
		[Description("Indicates whether to show only the last line of the messages or not")]
		[DefaultValue(false)]
		public bool SingleLine
		{
			get
			{
				if (ViewState["SingleLine"] == null) return false;
				return (bool)ViewState["SingleLine"];
			}
			set
			{
				ViewState["SingleLine"] = value;
			}
		}
		//---------------------------
		private Control MessageTarget
		{
			get
			{
				if (String.IsNullOrWhiteSpace(this.MessageTargetId)) return null;
				Control result = this.Parent.FindControl(this.MessageTargetId);
				if (result == null) throw new Exception("Invalid MessageTargetId '" + this.MessageTargetId + "'");
				if (!IsValidMessageTargetType(result)) throw new NotSupportedException("MessageTarget Type Not Supported");
				return result;
			}
		}
		private Control ProgressControl
		{
			get
			{
				if (String.IsNullOrWhiteSpace(this.ProgressControlId)) return null;
				Control result = this.Parent.FindControl(this.ProgressControlId);
				if (result == null) throw new Exception("Invalid ProgressControlId '" + this.ProgressControlId + "'");
				return result;
			}
		}
		private static bool IsValidMessageTargetType(Control control)
		{
			Type type = control.GetType();
			if (type == typeof(TextBox)) return true;
			if (type == typeof(Label)) return true;
			if (type == typeof(Panel)) return true;
			//if (type == typeof(ListBox)) return true;
			return false;
		}
	}
}