单击按钮更改LinqDataSource

Question

I have a GridView on my asp page. I want to change the LinqDataSource with a button click. it's because i have 2 database views and you have to be able to see one of these to views as you wish. My problems is nothing happens when I try to bind the GridView to any of my LinqDataSource'.

My C# code:

protected void Page_Load(object sender, EventArgs e)
{
    this.Grid.DataSource = lqds_Grid1;
    this.Grid.DataBind();
}

protected void Button1_Click(object sender, EventArgs e)
{
    if (this.Grid.DataSource == lqds_Grid1)
    {
        this.Grid.DataSource = lqds_Grid2;
        this.Grid.DataBind();
    }
    else
    {
        this.Grid.DataSource = lqds_Grid1;
        this.Grid.DataBind();
    }
}

my asp code:

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
    CodeBehind="Default.aspx.cs" Inherits="AddressReporting._Default" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
    <asp:LinqDataSource ID="lqds_Grid1" runat="server" 
        ContextTypeName="AddressReporting.MobileGateway" EntityTypeName="" 
        OrderBy="AdrID, Country" TableName="BarcodeWithLocation">
    </asp:LinqDataSource>
    <asp:LinqDataSource ID="lqds_Grid2" runat="server" 
        ContextTypeName="AddressReporting.MobileGateway" EntityTypeName="" 
        OrderBy="AdrID, Country" TableName="BarcodeWithLocationSorted">
    </asp:LinqDataSource>
    <asp:GridView ID="Grid" runat="server" AllowPaging="True" 
        AutoGenerateColumns="False" Height="217px" Width="268px">
</asp:GridView>
    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
</asp:Content>

Answer 1

it's because page_load method (event) work time page loads so it is not quite right so

protected void Page_Load(object sender, EventArgs e)
{
  if(!isPostBack) {
       this.Grid.DataSource = lqds_Grid1;
       this.Grid.DataBind();
   }
}

you should check page whether it has postback or not

Answer 2

first of all you could try to set your datasource to null before giving it the new value and after assigning the new value you can call the refresh method of the datagrid to force it to redraw itself

this.Grid.DataSource = null;
this.Grid.DataSource = lqds_Grid1;
this.Grid.DataBind();
this.Grid.DataSource.Refresh();