private void buttonSearch_Click(object sender, EventArgs e)
        {
            Client clien = ClientsDA.SearchID(Convert.ToInt32(textBoxSearcher.Text));

            if (clien != null)
            {
                textBoxclientID.Text          = (clien.ClientID).ToString();
                textBoxinstitutionname.Text   = clien.Name;
                textBoxstreet.Text            = clien.Street;
                textBoxcity.Text              = clien.City;
                maskedTextBoxPostalCode.Text  = clien.PostalCode;
                maskedTextBoxphonenumber.Text = clien.PhoneNumber;
                maskedTextBoxfaxnumber.Text   = clien.FaxNumber;
                textBoxcreditlimit.Text       = (clien.CreditLimit).ToString();
                textBoxclientID.Enabled       = false;
                textBoxSearcher.Clear();
            }

            else
            {
                MessageBox.Show("User not Found!");
                textBoxSearcher.Clear();
                textBoxSearcher.Focus();
            }
        }
        private void buttonSearchClient_Click(object sender, EventArgs e)
        {
            Client clien = ClientsDA.SearchID(Convert.ToInt32(textBoxClientSearcher.Text));

            if (clien != null)
            {
                textBoxclientname.Text = clien.Name;


                textBoxClientSearcher.Clear();
            }

            else
            {
                MessageBox.Show("User not Found!");
                textBoxClientSearcher.Clear();
                textBoxClientSearcher.Focus();
            }
        }