自定义控件求助

Question

自定义了一个分页控件，为什么在
protected override void RenderContents(HtmlTextWriter output) 方法中无法引用 sqlConnection,头部也无法引用System.Data命名空间！怎么弄啊！

Answer 1

下面是控件代码！刚学！请多指教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 mypage
{
    [DefaultProperty("Text")]
    [ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")]
    public class WebCustomControl1 : WebControl
    {
        [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;
            }
        }
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        public int PageSize
        {
            get
            {
                try
                {
                    Int32 s = (Int32)ViewState["PageSize"];
                    return ((s == null) ? 5 : s);
                }
                catch
                {
                    return 5;
                }
                
            }
            set
            {
                ViewState["PageSize"] = value;
            }
        }        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        public string DataPath
        {
            get
            {
                string s = (String)ViewState["DataPath"];
                return ((s == null) ? ("~/App_Data/data.mdb") : s);
            }
            set
            {
                ViewState["DataPath"] = value;
            }
        }
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        public string Table
        {
            get
            {
                string s = (String)ViewState["Table"];
                return ((s == null) ? ("news") : s);
            }
            set
            {
                ViewState["Table"] = value;
            }        }
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        public string sqlCommand
        {
            get
            {
                string s = (String)ViewState["sqlCommand"];
                return ((s == null) ? ("select * ") : s);
            }
            set
            {
                ViewState["sqlCommand"] = value;
            }
        }
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        public string indexPage
        {
            get
            {
                string s = (String)ViewState["indexPage"];
                return ((s == null) ? ("none") : s);
            }
            set
            {
                ViewState["indexPage"] = value;
            }
        }        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        public string pageName
        {
            get
            {
                string s = (String)ViewState["pageName"];
                return ((s == null) ? ("none") : s);
            }
            set
            {
                ViewState["pageName"] = value;
            }
       
        }
        protected override void RenderContents(HtmlTextWriter output)
        {
           
            output.Write();
        }
    }
}

Answer 2

在项目的结构图中的"引用"点右键，添加，在.net中选择System.Web即可
然后再WebCustomControl1 这个类中添加using System.web就可以了！