自定义控件图标无法设置的问题

 

下面是自定义控件的代码：现在就是图标无设置。另外发现在工具箱中，此控件无法删除。不知是什么原因。

  1using System;
  2using System.Collections.Specialized;
  3using System.ComponentModel;
  4using System.Drawing.Design;
  5using System.Drawing.Imaging;
  6using System.Globalization;
  7using System.Security.Permissions;
  8using System.Web;
  9using System.Web.UI;
 10using System.Web.UI.WebControls;
 11using System.Drawing;
 12
 13namespace ControlTooImg
 14{
 15    [ToolboxBitmap(typeof(MyTextBox))]
 16    //, "CustomControls.Resources.MyTextBox.bmp")
 17    
 18    [DefaultProperty("Text ")]
 19    [ToolboxData(" <{0}:MyTextBox   runat=server> </{0}:MyTextBox> ")]
 20    public class MyTextBox : WebControl, IPostBackDataHandler
 21    {
 22        private static readonly object EventTextChanged;
 23        [Category("Action "), Description("TextBox_OnTextChanged ")]
 24        public event EventHandler TextChanged
 25        {
 26            add
 27            {
 28                base.Events.AddHandler(EventTextChanged, value);
 29            }
 30            remove
 31            {
 32                base.Events.RemoveHandler(EventTextChanged, value);
 33            }
 34        }
 35
 36
 37        [DefaultValue(" "), Localizable(true), Bindable(true, BindingDirection.TwoWay),
 38        Category("Appearance "), Description("TextBox_Text "),
 39        PersistenceMode(PersistenceMode.EncodedInnerDefaultProperty)]
 40        public string Text
 41        {
 42            get
 43            {
 44                String s = (String)ViewState["Text "];
 45                return ((s == null) ? String.Empty : s);
 46            }
 47
 48            set
 49            {
 50                ViewState["Text "] = value;
 51            }
 52        }
 53
 54        protected override void RenderContents(HtmlTextWriter writer)
 55        {
 56            //output.Write(Text);
 57        }
 58
 59        protected override void Render(HtmlTextWriter writer)
 60        {
 61            writer.AddAttribute(HtmlTextWriterAttribute.Name, this.UniqueID);          
 62            writer.AddAttribute(HtmlTextWriterAttribute.Type, "Text ");
 63            writer.AddAttribute(HtmlTextWriterAttribute.Value, this.Text);
 64            writer.AddAttribute(HtmlTextWriterAttribute.Onchange, Page.GetPostBackEventReference(this, ""));                                            
 65            writer.AddAttribute(HtmlTextWriterAttribute.Id, this.UniqueID);
 66            writer.RenderBeginTag(HtmlTextWriterTag.Input);
 67            writer.RenderEndTag();
 68        }
 69
 70        
 71
 72        [Category("Behavior "), DefaultValue(false), Themeable(false), Description("TextBox_AutoPostBack ")]
 73        public virtual bool AutoPostBack
 74        {
 75            get
 76            {
 77                object obj2 = this.ViewState["AutoPostBack "];
 78                if (obj2 != null)
 79                {
 80                    return (bool)obj2;
 81                }
 82                return false;
 83            }
 84            set
 85            {
 86                this.ViewState["AutoPostBack "] = value;
 87            }
 88        }
 89
 90        bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection)
 91        {
 92            string text = this.Text;
 93            string str2 = postCollection[postDataKey];
 94            if (!text.Equals(str2, StringComparison.Ordinal))
 95            {
 96                this.Text = str2;
 97                return true;
 98            }
 99            return false;
        }

        void IPostBackDataHandler.RaisePostDataChangedEvent()
        {
            this.OnTextChanged(EventArgs.Empty);
        }

        protected virtual void OnTextChanged(EventArgs e)
        {
            EventHandler handler = (EventHandler)base.Events[EventTextChanged];
            if (handler != null)
            {
                handler(this, e);
            }
        }
    }
}

下面是截图：

1.用VS做的图标

2.将图标保存为和类同名文件存在项目中。并设置为嵌入资源

3。重新编译运行，控件的图标还是没有变。另外这个控件在工具箱中，为什么没有删除功能呀？

 

求高手解惑！