How do I move items from one gridview to another gridview?

I have two gridviews, and when the user highlights a row on the first gridview and clicks a button, it should move to the second gridview.

When I click on the button that record gets added but it only add t开发者_Go百科he last row I've selected (if I select 20 rows, only the last gets added).

All records that are selected should be moved.

How do I do this in ASP.NET?

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private void button1_Click_1(object sender, EventArgs e)
{
    DataGridViewRow dr = dataGridView1.SelectedRows[0];

    dtItems.Columns.Add("city_ID");
    dtItems.Columns.Add("city_Name");
    dtItems.Columns.Add("status");
    dtItems.Columns.Add("date");

    if (dataGridView1.Rows.Count > 1)
    {
        for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
        {
            if (dataGridView1.Rows[i].Cells[0].Value != null)
            {
                DataRow row;
                row = dtItems.NewRow();

                row["city_ID"] = dataGridView1.Rows[i].Cells[1].Value.ToString();
                row["city_Name"] = dataGridView1.Rows[i].Cells[2].Value.ToString();
                row["status"] = dataGridView1.Rows[i].Cells[3].Value.ToString();
                row["date"] = dataGridView1.Rows[i].Cells[4].Value.ToString();

                dtItems.Rows.Add(row);
            }
        }
    }

    Form2 frm = new Form2(dtItems);
    frm.ShowDialog();
}

In Form2 copy this code:

public Form2(DataTable dtIt)
{
    dtItems = dtIt;
    InitializeComponent();
}

private void AddEmptyRows()
{
    for (int i = 1; i <= 5; i++)
    {
        dataGV.Rows.Add();
    }
}

private void Form2_Load(object sender, EventArgs e)
{
    AddEmptyRows();

    for (int i = 0; i < dtItems.Rows.Count; i++) {
        dataGV.Rows[i].Cells[0].Value = dtItems.Rows[i]["city_ID"];
        dataGV.Rows[i].Cells[1].Value = dtItems.Rows[i]["city_Name"];
        dataGV.Rows[i].Cells[2].Value = dtItems.Rows[i]["status"];
        dataGV.Rows[i].Cells[3].Value = dtItems.Rows[i]["date"];
    }

    dataGV.Enabled = true;
}