Gridview表格未显示出来

最近写了一个图书馆的网站，，可是在显示图书信息时，图书的表格却未显示出来，，希望各位高手帮帮忙哈using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;public partial class bookInfoSearch : System.Web.UI.Page
{
    static string sql = "";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["userName"] != null)            　//判断管理员是否登录
        {
            if (!getSet())                               //判断是否拥有权限                  Response.Write("<script>alert('您没有此权限');location='index.aspx';</script>");
            else
                bindBookType();
        }
        else
        {
            Response.Redirect("entry.aspx");            //返回到登录页面
        }                  
    }
    public bool getSet()
    {
        string userName = Session["userName"].ToString();                       //获取管理员登录名
        string sql = "select * from tb_admSet where userName='" + userName + "'";
        SqlDataReader sdr = dataOperate.getRow(sql);
        sdr.Read();                                                             //读取一条记录
        return Convert.ToBoolean(sdr["systemSearch"]);                             //返回是否拥有权限
    }
    //自定义方法绑定图书类型
    public void bindBookType()
    {
        string typeSql = "select * from tb_bookType";
        ddlBookType.DataSource = dataOperate.getDataset(typeSql, "tb_bookType");
        ddlBookType.DataTextField = "typeName";
        ddlBookType.DataValueField = "typeID";
        ddlBookType.DataBind();
    }
    protected void ddlCondition_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (ddlCondition.SelectedValue.Trim() == "bookType")
        {
            txtKey.Visible = false;
            ddlBookType.Visible = true;
            RequiredFieldValidator1.Visible = false;
            bindBookType();
        }
        else
        {
            txtKey.Visible = true;
            RequiredFieldValidator1.Visible = true;
            ddlBookType.Visible = false;
        }
    }
    protected void btnSearch_Click(object sender, EventArgs e)
    {
        string Condition = ddlCondition.Text;
        string key = "";
        if (ddlBookType.Visible)
        {
            key = ddlBookType.SelectedValue;
        }
        else
            key = txtKey.Text;
        sql = "select * from tb_bookInfo where " + Condition + " like '%" + key + "%'";
        bindBookInfo(sql);
        txtKey.Text = "";       
    }
    public void bindBookInfo(string sql)
    {
        gvBookInfo.DataSource = dataOperate.getDataset(sql, "tb_bookInfo");
        gvBookInfo.DataBind();
    }
    protected void gvBookInfo_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {   //设置图书类型
            string bookType = e.Row.Cells[2].Text.ToString();               //获取图书类型编号
            string typeSql = "select * from tb_bookType where TypeID=" + bookType;
            SqlDataReader typeSdr = dataOperate.getRow(typeSql);
            typeSdr.Read();                                                 //读取一条记录
            e.Row.Cells[2].Text = typeSdr["typeName"].ToString();
            //设置书架
            string bookcase = e.Row.Cells[3].Text.ToString();               //获取书架编号
            string caseSql = "select * from tb_bookcase where bookcaseID=" + bookcase;
            SqlDataReader caseSdr = dataOperate.getRow(caseSql);
            caseSdr.Read();                                                 //读取一条记录
            e.Row.Cells[3].Text = caseSdr["bookcaseName"].ToString();
        }
    }
    protected void gvBookInfo_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        gvBookInfo.PageIndex = e.NewPageIndex;
        bindBookInfo(sql);
    }
}界面如下：
我想要的界面是这样的而在实际网站运行中，却得到了这样的界面却没中间的表格  不知是为何