my add row code is working but delete row code is not work

my add row code is working but delete row code is not work so please help me..?

protected void btnAddRowNonTaxRevenue_Click(object sender, EventArgs e)

{

for (int i = 2; i < 11; i++)

{

HtmlTableRow tr = ((HtmlTableRow)this.FindControl("ntrNTR" + i));

if (tr.Visible == false)

{

tr.Visible = true;

break;

}

protected void btnRemoveRowTaxRevenue_Click(object sender, EventArgs e)

{

for (int i = 2; i > 11; i++)

{

HtmlTableRow tr = ((HtmlTableRow)this.FindControl("trTR" + i));

if (tr.Visible == false)

{

tr.Visible = false;

break;

}