GridView自定义分页

<asp:GridView ID="GridView1" runat="server" OnPageIndexChanging="GridView1_PageIndexChanging"
        AutoGenerateColumns="False"  AllowPaging="True" PageSize="5" DataKeyNames="uid"  >
        <Columns>
    <asp:TemplateField HeaderText="名称" SortExpression="uname">
                                <EditItemTemplate>
                                    <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("uname") %>'></asp:TextBox>
                                </EditItemTemplate>
                                <ItemTemplate>
                                <%# DataBinder.Eval(Container.DataItem, "uname")%></a>
                                </ItemTemplate>
                            </asp:TemplateField>  
                    <asp:TemplateField HeaderText="年龄" SortExpression="uname">
                        <EditItemTemplate>
                            <asp:TextBox ID="txtAge" runat="server" Text='<%# Bind("age") %>'></asp:TextBox>
                       
                        </EditItemTemplate>
                        <ItemTemplate>
                            <asp:Label ID="Label2" runat="server" Text='<%# Bind("age") %>'></asp:Label>
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="性别" SortExpression="sex">
                        <EditItemTemplate>
                            <asp:TextBox ID="txtSex" runat="server" Text='<%# Bind("sex") %>'></asp:TextBox>
                       
                        </EditItemTemplate>
                        <ItemTemplate>
                            <asp:Label ID="Label3" runat="server" Text='<%# Bind("sex") %>'></asp:Label>
                        </ItemTemplate>
                    </asp:TemplateField>
                   </Columns>
        </asp:GridView>
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="前一页" />
        <asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="后一页" />
        <asp:Button ID="Button3" runat="server" OnClick="Button3_Click" Text="最后一页" />
        <asp:Button ID="Button4" runat="server" OnClick="Button4_Click" Text="第一页" />

 后台代码：

 

 public void GridViewDataBind()
    ...{
        Button1.Enabled = true;
        Button2.Enabled = true;
       
        try
        ...{
            
            SqlDataAdapter da = new SqlDataAdapter("select * from test", conn);
            DataSet ds = new DataSet();
            da.Fill(ds, "customers");
            if (ds.Tables[0].Rows.Count == 0)
            ...{
                AddDummyData(ds);
            }
            GridView1.DataSource = ds.Tables["customers"];
            GridView1.AllowPaging = true;
            GridView1.PageSize = 5;
            GridView1.DataBind();

            if (GridView1.PageIndex == 0)
            ...{
                Button1.Enabled = false;
            }
            if (GridView1.PageIndex == GridView1.PageCount - 1)
            ...{
                Button2.Enabled = false;
            }

        }
        catch(Exception ex)
        ...{
            ex.ToString();
        }

    }
    protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
    ...{
        GridView1.PageIndex = e.NewPageIndex;
        GridViewDataBind();
    }
    protected void Button1_Click(object sender, EventArgs e)
    ...{
        GridView1.PageIndex = GridView1.PageIndex - 1;
        GridViewDataBind();
    }
    protected void Button2_Click(object sender, EventArgs e)
    ...{
        GridView1.PageIndex = GridView1.PageIndex + 1;
        GridViewDataBind();
    }
    protected void Button3_Click(object sender, EventArgs e)
    ...{
        GridView1.PageIndex = GridView1.PageCount - 1;
        GridViewDataBind();
    }
    protected void Button4_Click(object sender, EventArgs e)
    ...{
        GridView1.PageIndex = 0;
        GridViewDataBind();
    }
    private void AddDummyData(DataSet ds)
    ...{

        //如果没有数据显示空行

        DataTable dt = ds.Tables[0];

        DataRow newRow = dt.NewRow();

        dt.Rows.Add(newRow);

    }