GridView 批量删除,自定义分页,定位页码

前台代码:
<table width="100%" height="20"  border="1" align="center" cellpadding="0" cellspacing="0" bordercolorlight="#FFFFFF" bordercolordark="#E6E6E6" bgcolor="#FFFFFF">
                <tr bgcolor="#FFFFFF">
                  <td width="7%" align="center">
                      <asp:CheckBox ID="cbAll" runat="server" AutoPostBack="True" OnCheckedChanged="cbAll_CheckedChanged" /></td>
                  <td width="8%" align="center"><img src="images/bz.gif" width="6" height="11"></td>
                  <td width="9%" align="center"><img src="images/mail.gif" width="14" height="11"></td>
                  <td width="16%" align="center">发件人</td>
                  <td width="39%" align="center">标题</td>
                  <td width="21%" align="center">日期</td>
                </tr></table>
               
                <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
                    BackColor="White" BorderColor="#CC9966" BorderWidth="1px" CellPadding="4"
                    DataKeyNames="id" HorizontalAlign="Center"
                    Width="100%" BorderStyle="None" ShowHeader="False" AllowPaging="True" OnDataBound="GridView1_DataBound">
                   
                    <FooterStyle BackColor="#FFFFCC" ForeColor="#330099" />
                    <Columns>
                        <asp:TemplateField >
                            <ItemStyle HorizontalAlign="Center" />
                            <ItemTemplate>
                            <asp:CheckBox ID=cb runat=server />
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:ImageField HeaderImageUrl="images/bz.gif">
                            <ItemStyle Width="8%" />
                        </asp:ImageField>
                        <asp:TemplateField HeaderImageUrl="images/mail.gif">
                        <ItemTemplate>
                        <img src=<%# Eval("view").ToString()=="0"?"images/mailread.gif":"images/mail.gif" %> border=0 align=middle />
                        </ItemTemplate>
                            <ItemStyle HorizontalAlign="Center" Width="9%" />
                        </asp:TemplateField>
                        <asp:BoundField DataField="email" HeaderText="发件人">
                            <ItemStyle Width="16%" />
                        </asp:BoundField>
                        <asp:HyperLinkField DataNavigateUrlFields="id" DataNavigateUrlFormatString="viewmail.aspx?id={0}"
                            DataTextField="title" HeaderText="标题" >
                            <ItemStyle Width="39%" />
                        </asp:HyperLinkField>
                        <asp:BoundField DataField="date" DataFormatString="{0:d}" HeaderText="日期">
                            <ItemStyle Width="21%" />
                        </asp:BoundField>
                    </Columns>
                    <PagerTemplate>

                    </PagerTemplate>
                    <SelectedRowStyle BackColor="#FFCC66" ForeColor="#663399" Font-Bold="True" />
                    <PagerStyle BackColor="#FFFFCC" ForeColor="#330099" HorizontalAlign="Center" />
                    <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="#FFFFCC" />
                    <RowStyle BackColor="White" ForeColor="#330099" />
                </asp:GridView>
                <table width="100%" height="20"  border="1" cellpadding="0" cellspacing="0" bordercolorlight="#FFFFFF" bordercolordark="#E6E6E6" bgcolor="#FFFFFF">
                <tr><td>
                    <asp:Button ID="Button1" runat="server" Text="全选" OnClick="Button1_Click" />&nbsp;
                    <asp:Button ID="Button2" runat="server" Text="删除" OnClick="Button2_Click" /></td>
                    <td align=right>
                        <asp:LinkButton ID="lnkbtnFrist" runat="server" OnClick="lnkbtnFrist_Click">首页</asp:LinkButton>
                        <asp:LinkButton ID="lnkbtnPre" runat="server" OnClick="lnkbtnPre_Click">上一页</asp:LinkButton>
                        <asp:Label ID="lblCurrentPage" runat="server"></asp:Label>
                        <asp:LinkButton ID="lnkbtnNext" runat="server" OnClick="lnkbtnNext_Click">下一页</asp:LinkButton>
                        <asp:LinkButton ID="lnkbtnLast" runat="server" OnClick="lnkbtnLast_Click">尾页</asp:LinkButton>
                        跳转到第<asp:DropDownList ID="ddlCurrentPage" runat="server" AutoPostBack="True" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
                        </asp:DropDownList>页</td>
                </tr></table>

后台代码:

  void DataBinds()
    {
        if (!opMail.ReceiveGetList(userid))
        {
            base.MessageBox(string.Empty, opMail.strErrMsg);
        }
        else
        {
            this.GridView1.DataSource = opMail.dataView;
            this.GridView1.DataBind();
        }

        this.ddlCurrentPage.Items.Clear();
        for (int i = 1; i <= this.GridView1.PageCount; i++)
        {
            this.ddlCurrentPage.Items.Add(i.ToString());
        }
        this.ddlCurrentPage.SelectedIndex = this.GridView1.PageIndex;
    }
    //全选checkbox
    protected void Button1_Click(object sender, EventArgs e)
    {
        foreach (GridViewRow row in GridView1.Rows)
        {
            ((CheckBox)row.Cells[0].FindControl("cb")).Checked = true;
        }
    }
    //删除所选
    protected void Button2_Click(object sender, EventArgs e)
    {
        for (int rowindex = 0; rowindex < this.GridView1.Rows.Count; rowindex++)
        {
            if (((CheckBox)this.GridView1.Rows[rowindex].Cells[0].FindControl("cb")).Checked == true)
            {
                //删除Convert.ToInt32(this.GridView1.DataKeys[rowindex].Value)
                if (!opMail.ReceiveDelete(Convert.ToInt32(this.GridView1.DataKeys[rowindex].Value)))
                {
                    base.MessageBox(string.Empty, opMail.strErrMsg);
                }
            }
        }
        DataBinds();
    }
    protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        this.GridView1.PageIndex = e.NewPageIndex;
        DataBinds();
    }
    protected void cbAll_CheckedChanged(object sender, EventArgs e)
    {
        if (this.cbAll.Checked == true)
        {
            foreach (GridViewRow row in GridView1.Rows)
            {
                ((CheckBox)row.Cells[0].FindControl("cb")).Checked = true;
            }
        }
        else
        {
            foreach (GridViewRow row in GridView1.Rows)
            {
                ((CheckBox)row.Cells[0].FindControl("cb")).Checked = false;
            }
        }
    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        this.GridView1.PageIndex = this.ddlCurrentPage.SelectedIndex;
        DataBinds();
    }
    protected void lnkbtnFrist_Click(object sender, EventArgs e)
    {
        this.GridView1.PageIndex = 0;
        DataBinds();
    }
    protected void lnkbtnPre_Click(object sender, EventArgs e)
    {
        if (this.GridView1.PageIndex > 0)
        {
            this.GridView1.PageIndex = this.GridView1.PageIndex - 1;
            DataBinds();
        }
    }
    protected void lnkbtnNext_Click(object sender, EventArgs e)
    {
        if (this.GridView1.PageIndex < this.GridView1.PageCount)
        {
            this.GridView1.PageIndex = this.GridView1.PageIndex + 1;
            DataBinds();
        }
    }
    protected void lnkbtnLast_Click(object sender, EventArgs e)
    {
        this.GridView1.PageIndex = this.GridView1.PageCount;
        DataBinds();
    }
    protected void GridView1_DataBound(object sender, EventArgs e)
    {
        this.lblCurrentPage.Text = string.Format("当前第{0}页/总共{1}页", this.GridView1.PageIndex + 1, this.GridView1.PageCount);
    }