C# datagridview last row

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C#

SQL

hi :) ,i connect datagridview to sql to show data on datagridview. i have add a checkbox,and change color of row to red when is check. and when is check automatic next row.
my problem is here when is the last row that give me a error. what i want is when is the last row , check and dont try to add a new row.

What I have tried:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{

//Fill Datagrid
this.uSR_ProdMonitorTableAdapter.FillBy(this.iso_OldDataSet.USR_ProdMonitor);

}

private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
bool selected = !Convert.ToBoolean(dataGridView1.Rows[e.RowIndex].Cells["check"].Value);
dataGridView1.Rows[1].Selected = true;

if (selected)
{
//if is check automatic nex row
int next = this.dataGridView1.CurrentRow.Index +1;
//change color to red if check
dataGridView1.Rows[e.RowIndex].DefaultCellStyle.BackColor = Color.Red;
this.dataGridView1.CurrentCell = this.dataGridView1.Rows[next].Cells[this.dataGridView1.CurrentCell.ColumnIndex];
}
else
{
dataGridView1.Rows[e.RowIndex].DefaultCellStyle.BackColor = Color.LightGreen;
dataGridView1.Rows[e.RowIndex].Cells["check"].Value = !Convert.ToBoolean(dataGridView1.Rows[e.RowIndex].Cells["check"].Value);

}
}


}

}