Custom WebContol DropDownList

[harshmaul]

Hi, first let me post my code....

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
 
namespace SPGMediaWebControls
{
    [DefaultProperty("Text")]
    [ToolboxData("<{0}:ErrorDropDownList runat=server></{0}:ErrorDropDownList>")]
    public class ErrorDropDownList : DropDownList
    {
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        public string Text
        {
            get
            {
                String s = (String)ViewState["Text"];
                return ((s == null) ? String.Empty : s);
            }
 
            set
            {
                ViewState["Text"] = value;
            }
        }
        private string errorMsg;
 
        public string ErrorMsg
        {
            get { return errorMsg; }
            set { errorMsg = value; }
        }
        public override void RenderEndTag(HtmlTextWriter writer)
        {
            base.RenderEndTag(writer);
            writer.WriteEndTag("div");
        }
        public override void RenderBeginTag(HtmlTextWriter writer)
        {
            errorMsg = errorMsg == null ? "" : errorMsg;
            string errorCSS = "errorCSS";
            if (errorMsg.Length > 1)
            {
                writer.WriteBeginTag("div class='" + errorCSS + "' style='border:2px solid #0000ff'>");
            }
            else
            {
                errorMsg = "";
                writer.WriteBeginTag("div>");
            }
            base.RenderBeginTag(writer);
            writer.Write(errorMsg);
 
        }
        protected override void RenderContents(HtmlTextWriter output)
        {
            output.Write(Text);
        }
    }
}
 

I'm trying to override the drop down list control so that i can standardise validation throughout the all of our user interfaces.

However i can't work out how to add ListItems to this. Some please shoot me, and if you can't do that please tell me what i'm doing wrong.

Thanks.

[harshmaul]

Hi all, i solved it, incase your interested.... heres the final code...

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
 
namespace MyWebControls
{
    [DefaultProperty("Text")]
    [ToolboxData("<{0}:ErrorDropDownList runat=server></{0}:ErrorDropDownList>")]
    public class ErrorDropDownList : System.Web.UI.WebControls.DropDownList
    {
 
        [
 
        Bindable(true)]
 
        private string errorMsg;
 
        public string ErrorMsg
        {
            get { return errorMsg; }
            set { errorMsg = value; }
        }
        public override void DataBind()
        {
            base.DataBind();
        }
 
        public override void RenderBeginTag(HtmlTextWriter writer)
        {
                        errorMsg = errorMsg == null ? "" : errorMsg;
            string errorCSS = "errorCSS";
            if (errorMsg.Length > 1)
            {
                writer.WriteBeginTag("div class='" + errorCSS + "' style='border:2px solid #0000ff'>");
            }
            else
            {
                errorMsg = "";
                writer.WriteBeginTag("div>");
            }
            base.RenderBeginTag(writer);
        }
        public override void RenderControl(HtmlTextWriter writer)
        {
            base.RenderControl(writer);
        }
        public override void RenderEndTag(HtmlTextWriter writer)
        {
            base.RenderEndTag(writer);
                        writer.Write(errorMsg);
            writer.WriteEndTag("div");
        }
 
    }
}

You can give it a error message and then write a style for the CSS class "errorCSS".