'Writing' HTML Code in C# SharePoint Web Part

I'm trying to figure out a way where I can write html code to a SharePoint Web Part with C#. I don't even know if this is possible but I'm assuming it is. In JavaScript it would just be something along the lines of document.write("<br>" + variable + "</b>") so I'm just trying to figure out how this will work in C#. There is a much bigger picture than this but this is the basic portion I'm stuck on.

I would like the HTML Code to be inside of the for loop below.

Here's the code:

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Utilities;
using System.Web;

namespace CSharpAttempt.VisualWebPart1
{

public class getTheSPItems
{
    public void Page_Load(object sender, EventArgs e)
    {
        int i;

        for (i = 0; i <= 10; i++)
        {
            string theHtmlString = "<b>" + i + "</b>";
            Response.Write(theHtmlString);

        }
    }
}



public partial class VisualWebPart1UserControl : UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
}
}