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Asked: 2026-05-17T22:33:47+00:00

I am completly new in asp.net and I’m having some problems with it. I

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I am completly new in asp.net and I’m having some problems with it.
I created litle web form for demo and learning and I have some problems with it. Hopefuly you can help me 🙂

What I want is that:

  • when I click on “Kill X” button in table, I get “You pressed button Kill X” message in label “lblMsg”. I Also want that I get table with new data.
  • when I click “Load” button, I need to get additional rows in the table. For example now when page loads there is 10 rows in table and when I click “Load” I nedd to get additional 10 rows at the end into the same table.

P.S:
I would be grateful for some tutorial how to deal with events in asp.net.

Bellow is the code:

WebForm1.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="HelpdeskOsControl.WebForm1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
<asp:Panel ID="Panel1" runat="server" Height="465px" Width="417px">
    <asp:Table ID="Processes" runat="server" Height="20px" Width="400px" CssClass="tablesorter">
        <asp:TableHeaderRow ID="ProcessesHeader" runat="server" 
        TableSection="TableHeader">
            <asp:TableHeaderCell ID="TableHeaderCell1" runat="server">Name</asp:TableHeaderCell>
            <asp:TableHeaderCell ID="TableHeaderCell2" runat="server">CPU</asp:TableHeaderCell>
            <asp:TableHeaderCell ID="TableHeaderCell3" runat="server">Memory</asp:TableHeaderCell>
            <asp:TableHeaderCell ID="TableHeaderCell4" runat="server"></asp:TableHeaderCell>
        </asp:TableHeaderRow>
    </asp:Table>
    <asp:Panel ID="Panel2" runat="server">
        <asp:Button ID="btnLoad" runat="server" onclick="btnLoad_Click" Text="Load" />
        <asp:Button ID="btnClear" runat="server" onclick="btnClear_Click" 
            Text="Clear" />
        <asp:Label ID="lblMsg" runat="server" Text="Label"></asp:Label>
    </asp:Panel>
</asp:Panel>
    </form>
</body>
</html>

WebForm1.aspx.cs

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

namespace HelpdeskOsControl
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
                GenerateTable(getTestData());
        }

        private List<string> getTestData()
        {
            List<string> tData = new List<string>();
            Random rand = new Random();
            for (int i = 0; i < 10; i++)
            {
                tData.Add("proc" + i + "_" + rand.Next(100) + "_" + rand.Next(100));
            }

            return tData;
        }

        protected void btnClear_Click(object sender, EventArgs e)
        {
            for (int i = Processes.Rows.Count; i > 1; i--)
            {
                Processes.Rows.RemoveAt(i - 1);
            }
        }

        protected void btnLoad_Click(object sender, EventArgs e)
        {
            GenerateTable(getTestData());
        }

        protected void btnKill_Click(object sender, EventArgs e)
        {
            lblMsg.Text = "You pressed button " + ((Button)sender).Text;
        }

        private void GenerateTable(List<string> list)
        {
            int st = 0;
            foreach (string line in list)
            {
                TableRow tr = new TableRow();
                Processes.Controls.Add(tr);

                foreach (String str in line.Split('_'))
                {
                    int index = tr.Cells.Add(new TableCell());
                    tr.Cells[index].Text = str;
                }

                Button b = new Button();
                b.Text = "Kill " + st;
                b.ID = "btnKill_" + st;
                b.Click += new EventHandler(btnKill_Click);
                TableCell tc = new TableCell();
                tc.Controls.Add(b);
                tr.Cells.Add(tc);

                tr.TableSection = TableRowSection.TableBody;
                st++;
            }
            Processes.BorderStyle = BorderStyle.Solid;
            Processes.GridLines = GridLines.Both;
            Processes.BorderWidth = 2;
        }

    }
}-
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1 Answer

  1. Editorial Team

    I understand this is your first time with ASP.NET and want to help you learn more about its potentials.

    First of all, I would replace the code you wrote with data binding, which is a way to easily build tables without having to write methods like your generateTable. ASP.NET takes care of building the table by itself. It will take me a while to illustrate you full code for achieving this, but I hope you can grab the documentation and start learning with my help.

    The key control is GridView. It can be populated using a two-lines code fragment

    protected override OnLoad(EventArgs e)
{
    if (!IsPostback) DataBind();
}

protected override void OnDataBind(EventArgs e)
{
    gridView.DataSource = getTestData();
    gridView.DataBind();
}

    You must first configure columns in layout. The articles about GridView deal with this, and you can add a button for each row.

    Now,

    you can set the buttons as command buttons, thus not only raising the Click event, but, more important, the Command event which takes a name and an argument. That’s where you can inject your code. For example

    <asp:Button id="btnSomething" CommandArgument="[procId]" CommandName="kill" OnCommand="myCommandHandler" />

protected void myCommandHandler(object sender, CommandEventArgs e)
{
    if (e.CommandName=="kill")
    {
        killProcess(e.CommandArgument);
        
        DataBind(); //MOST IMPORTANT
    }
}

    Hope to have been of help. I wrote this code by hand, so please understand me if it will not work immediately

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