I want to delete gridview row on button click

protected void Button1_Click1(object sender, EventArgs e)
{
    foreach (GridViewRow gdv in GridView1.Rows)
    {
        CheckBox chk = (gdv.Cells[0].FindControl("chkbox1") as CheckBox);

        if (chk.Checked == true)
        {
            var Label = gdv.Cells[0].FindControl("lblid") as Label;
            SqlConnection cn = new SqlConnection(constr);
            SqlCommand cmd = new SqlCommand("Delete from tbl_login where Id=@Id", cn);
            cmd.Parameters.AddWithValue("@Id", int.Parse(Label.Text));
            cn.Open();
            int id = cmd.ExecuteNonQuery();
            cn.Close();

            Gridviewdetail();
        }

    }
}