How do i.fix my linkbutton on my website because when I click on it, it won't delete but it's suppose to?

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C#

ASP.NET

Hi my delete button which is a LinkButton doesn't work while it took a long time for me to type the code for it to work but I don't know what's wrong with it, please help. Here is some code for it.

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

public partial class fileuploader : System.Web.UI.Page
{

protected void Page_Load(object sender, EventArgs e)
{
show_data();
}

private void show_data()
{
DirectoryInfo d = new DirectoryInfo(MapPath("~/data/"));
FileInfo[] r = d.GetFiles();
DataTable dt = new DataTable();
dt.Columns.Add("path");
for (int i = 0; i < r.Length; i++)
{
DataRow row=dt.NewRow();
row["path"] = "~/data/" + r[i].Name;
dt.Rows.Add(row);
}
DataList1.DataSource = dt;
DataList1.DataBind();
}
protected void Button1_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
string path = "~/data/" + Guid.NewGuid().ToString() + "" + Path.GetExtension(FileUpload1.FileName);
FileUpload1.SaveAs(MapPath(path));
Response.Write("Save Succesfully");
show_data();
}
}
protected void LinkButton1_Command(object sender, CommandEventArgs e)
{
file.Delete(MapPath(e.CommandArgument.ToString()));
Response.Write("File Deleted Succesfully");
show_data();
}
}

What I have tried:

I've been told to add Onclick="LinkButton1_Command" but I'm not where to add it, is it in the source code and please list some steps I could follow as the solution for that