winform窗体内根据数据库创建控件并加入方法时有个问题请高手指点

Question

有代码如下using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;namespace Winter_vacation_homework
{
    public partial class FormShopFloor : Form
    {
        public FormShopFloor()
        {
            InitializeComponent();
        }
        //加载窗体时根据数据库动态创建大类按钮
        private void FormShopFloor_Load(object sender, EventArgs e)
        {
            try
            {
                Sqlconnectionfactory.GetSqlConnection();
                String sql = "select name from category"; 
                SqlDataReader dr = Sqlconnectionfactory.Select(sql);
                int count = 0;
                while (dr.Read())
                {
                    string btnName = dr.GetString(0);
                    System.Windows.Forms.Button newbtn = new System.Windows.Forms.Button();
                    //根据逻辑创建第二个button 按钮时也是newbtn 但没出错，为什么？
                    newbtn.Name = "btn" +count;
                    newbtn.Size = new System.Drawing.Size(75, 23);
                    newbtn.TabIndex = count;
                    newbtn.Text = btnName;
                    newbtn.UseVisualStyleBackColor = true;
                    this.splitContainer1.Panel1.Controls.Add(newbtn);
                    newbtn.Location = new System.Drawing.Point(28,45+45 * count);
                    newbtn.Click+= new System.EventHandler(this.newbtn_Click);
                    count++;
                }
            }
            catch (SqlException sqlex)
            {
                Console.WriteLine(sqlex.Message);
            }
            finally
            {                Sqlconnectionfactory.Close();
            }
        }        private void newbtn_Click(object sender, EventArgs e)
        {
            string sql= "select name from subcategory";
            //上面语句没有实现具体的大类按钮所要对应创建子类的tabpage,问题是如何得到上面由数据库创建的各个按钮大类按钮名,我估计这个是重点出错的环节
            int count=0;
            try 
            {
                Sqlconnectionfactory.GetSqlConnection();
                SqlDataReader dr = Sqlconnectionfactory.Select(sql);
                while(dr.Read())
                {
                    string tbgName = dr.GetString(0);
                    System.Windows.Forms.TabPage newTbg = new System.Windows.Forms.TabPage();
                    //根据逻辑创建第二个大类按钮的子类tabpage时也是 newTbg 这里却出错，为什么？
                    this.tabControl1.Controls.Add(newTbg);
                    newTbg.Name = "tbg"+count;
                    newTbg.Size = new System.Drawing.Size(495, 326);
                    newTbg.TabIndex = count;
                    newTbg.Text = tbgName;
                    newTbg.UseVisualStyleBackColor = true;
                }
            }
            catch (SqlException sqlex)
            {
                Console.WriteLine(sqlex.Message);
            }
            finally
            {                Sqlconnectionfactory.Close();
            }
        }
    }
}问题就注释里，请高手指点，小弟感激不尽

Answer 1

出的什么错，出错的地方换成
this.tabControl1.TabPages.Add(newTbg);
试试

Answer 2

根据刚才的修改就是在 private void newbtn_Click(object sender, EventArgs e)
        {
            string sql= "select name from subcategory";
            //上面语句没有实现具体的大类按钮所要对应创建子类的tabpage,问题是如何得到上面由数据库创建的各个按钮大类按钮名,我估计这个是重点出错的环节
            int count=0;
            try 
            {
                Sqlconnectionfactory.GetSqlConnection();
                SqlDataReader dr = Sqlconnectionfactory.Select(sql);
                while(dr.Read())
                {
                    string tbgName = dr.GetString(0);
                    System.Windows.Forms.TabPage newTbg = new System.Windows.Forms.TabPage();
                    //根据逻辑创建第二个大类按钮的子类tabpage时也是 newTbg 这里却出错，为什么？
                    this.tabControl1.Controls.Add(newTbg);
                    newTbg.Name = "tbg"+count;
                    newTbg.Size = new System.Drawing.Size(495, 326);
                    newTbg.TabIndex = count;
                    newTbg.Text = tbgName;
                    newTbg.UseVisualStyleBackColor = true;
                }
            }
的这个sql语句不知道怎么写，因为上面产生的button不知道怎么得到它的名字啊，如果能得到名字就可以写成 string sql= "select name from subcategory where categry='"+按钮显示的文本"'";