启用URL分页导致查询按钮查出来的数据有重复，特别着急往作者和高手们帮忙

[wodelaopos]

public void bind(int page, string typee, string prrice)//绑定数据方法
    {
        int currentPage = AspNetPager1.CurrentPageIndex;
        int pageSize = AspNetPager1.PageSize;
        PagedDataSource ps = new PagedDataSource();
        dt.Load(cmd.ExecuteReader());
        ps.DataSource = dt.DefaultView;
        ps.AllowPaging = true;
        ps.PageSize = 15;
        AspNetPager1.RecordCount = dt.Rows.Count;
        ps.CurrentPageIndex = page - 1;
        AspNetPager1.PageSize = 15;
        AspNetPager1.CurrentPageIndex = page;
        AspNetPager1.AlwaysShow = false;
        Repjl.DataSource = ps;
        Repjl.DataBind();
     }首次加载全部数据，然后再根据dropdownList的选项查询，现在是首次加载没问题，按选项值查询的时候就会有重复数据
查询方法如下
protected void btnSelect_Click(object sender, EventArgs e)
    {
        bind(1, DropDownList1.SelectedValue, txtPrice.Text);
    }

下面是AspNetPager的PageChanging事件

protected void AspNetPager1_PageChanging(object src, Wuqi.Webdiyer.PageChangingEventArgs e)
    {
        this.bind(e.NewPageIndex, DropDownList1.SelectedValue, txtPrice.Text);
    }