Adding data of textbox control to datagridview by using foreach statement

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C#2.0

C#

Dear Sir, In my windows form I used textboxes to add data to datagridview. Data will be filled in first row, in the same time again data will be filled in the second row. I am trying to write some codes for it but not succeeded. I have forgot the sequence. my codes are

public partial class DVdata : Form
    {
        public DVdata()
        {
            InitializeComponent();
        }
        DataTable dt = new DataTable();
        DataRow dr;

        private void button1_Click(object sender, EventArgs e)
        {
            dt.Columns.Add("Column1", typeof(int));
            dt.Columns.Add("Column2", typeof(string));
            dt.Columns.Add("Column3", typeof(string));
            dt.Columns["Column1"].AutoIncrement = true;
            dt.Columns["Column1"].AutoIncrementSeed = 1;
            dt.Clear();
            dataGridView1.DataSource = dt;
            foreach (DataRow row in dt.Rows)
            {
                dt.Rows.Add(null, row["Column2"].ToString(), row["Column2"].ToString());
            }
            dt.Rows.Add(null, textBox1.Text, textBox2.Text);
            dataGridView1.DataSource = dt;
        }

        public void DataBind()
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("Column1", typeof(int));
            dt.Columns.Add("Column2", typeof(string));
            dt.Columns.Add("Column3", typeof(string));
            dt.Clear();
            dataGridView1.DataSource = dt;
           
        }
    }
} 

I forgot what next?