printing pyramid of traingles

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C#

ASP

C#4.0

good afternoon

i have a task of printing the numbers in two different forms.

First, if i give a value of 5 the result should be
******** 1
******* 2 3
****** 4 5 6
***** 7 8 9 10
*** 11 12 13 14 15

second, if i give a value of 5 the result should be

1
2 3
4 5 6
7 8 9 10

i am writing the code for first one as

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

public partial class Pyramid : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    protected void btnsubmit_Click(object sender, EventArgs e)
    {
        int n = int.Parse(txtenternoofrows.Text);

        int i, j, k = 1;

        for (i = 1; i < n; i++)
        {
            for(j=1; j<i+1; j++)
            {
                Response.Write("k++");
            }

            Response.Write("\n");
        }
    }
}

please help me