Binding a RadGrid to a List<> collection on a button click

[John]

Hi,

I can easily bind the grid to a List<> collection on Page_Load. However, I'm unable to populate the grid with data on an postback from an user event - for example a button click, and I can't really understand why.

Below is a sample of what I'm trying to do - the result should be the three random rows inserted into the grid, but the grid remains empty. I also can provide a small project sample, but I can't attach it to the post - you only accept gif, jpg files?

ASPX:

<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="test.aspx.cs" Inherits="WebApplication1.test" %>

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>
<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
    <telerik:RadButton ID="RadButton1" runat="server" Text="Load"
        onclick="RadButton1_Click">
    </telerik:RadButton>
    <telerik:RadGrid Width="400px" Height="400px" ID="RadGrid1" runat="server">
    </telerik:RadGrid>
</asp:Content>

Code behind:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication1
{
    public partial class test : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void RadButton1_Click(object sender, EventArgs e)
        {
            List<FillTest> testList = new List<FillTest>();
            testList.Add(new FillTest("wer", "ERterte", "ertert", "ertert"));
            testList.Add(new FillTest("ertert", "dfgdfg", "ertert", "ertert"));
            testList.Add(new FillTest("dgdfg", "rwer", "pfsd", "vfswe"));
            RadGrid1.DataSource = testList;
        }
    }

    public class FillTest
    {
        string _testProperty, _test, _description, _code;

        public string Code
        {
            get { return _code; }
            set { _code = value; }
        }
        public string Test
        {
            get { return _test; }
            set { _test = value; }
        }
        public string Description
        {
            get { return _description; }
            set { _description = value; }
        }
        public string TestProperty
        {
            get { return _testProperty; }
            set { _testProperty = value; }
        }

        public FillTest(string testProperty, string test, string description, string code)
        {
            _testProperty = testProperty;
            _test = test;
            _description = description;
            _code = code;
        }
    }
}

[Radoslav]

Hello John,

When you use simple data-binding you need to call Rebind() method explicitly. So in your case you need to change the RadButton1_Click as following:

protected void RadButton1_Click(object sender, EventArgs e)
    {
        List<FillTest> testList = new List<FillTest>();
        testList.Add(new FillTest("wer", "ERterte", "ertert", "ertert"));
        testList.Add(new FillTest("ertert", "dfgdfg", "ertert", "ertert"));
        testList.Add(new FillTest("dgdfg", "rwer", "pfsd", "vfswe"));
        RadGrid1.DataSource = testList;
        RadGrid1.Rebind();
    }

I hope this helps.

Greetings,
Radoslav
the Telerik team

[John]

Thanks, problem solved.