C# MessageBox looping in foreach using Checkbox(datagridview)

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C#

DataGridView

MessageBox

Hi, im working on a datagridview and update rows using checkbox, and program works, but i have problems in Messagebox showing multiple Message "Success"

Here's my code Displaying on datagridview

MySqlDataAdapter sda = new MySqlDataAdapter("Select * from Foreclosed", con);
  DataTable dt = new System.Data.
 sda.Fill(dt);
metroGrid1.Rows.Clear();
foreach (DataRow item in dt.Rows)
    {
      int n = metroGrid1.Rows.Add();
       metroGrid1.Rows[n].Cells[0].Value = "false";
       metroGrid1.Rows[n].Cells[1].Value = item["Bank_Code"].ToString();
       metroGrid1.Rows[n].Cells[2].Value = item["Property_Code"].ToString();
       metroGrid1.Rows[n].Cells[3].Value = item["Region"].ToString();
       metroGrid1.Rows[n].Cells[4].Value = item["Province"].ToString();
       metroGrid1.Rows[n].Cells[5].Value = item["Detailed_Address"].ToString();

For the Update Button

foreach (DataGridViewRow item in metroGrid1.Rows)
{
    var cell = item.Cells[0];
    var value = cell.Value;
    if (cell != null)
    {
        if (value != null && (bool)value == true)
        { 
            con.Open();
            MySqlCommand com2 = new MySqlCommand("UPDATE Foreclosed SET Bank_Code=@bankcode WHERE Property_Code='" + item.Cells[2].Value.ToString() + "'", con);
            com2.Parameters.AddWithValue("@bankcode", fmupdtxtBox.Text);
            com2.ExecuteNonQuery();
            con.Close();
        }
        MessageBox.Show("Success");
    }
}

Kindly help me how to avoid getting a loop message