private void btnDelete_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("Do You really want to delete this Agent?", "DELETE", MessageBoxButtons.YesNo, MessageBoxIcon.Warning) == DialogResult.Yes)
            {
                int refagent = (int)gridAll.Rows[gridAll.CurrentRow.Index].Cells[0].Value;

                if (admin.Delete_Agent(refagent))
                {
                    MessageBox.Show("Agent ID" + refagent + " is successfully Deleted", "Agent Deleted");
                }
                else
                {
                    MessageBox.Show("Agent " + refagent + " is not deleted.", "Try Again");
                }
            }
            gridAll.DataSource = admin.Search_All_Agents();
            ButtonControl(true, true, false, false, true, false);
        }