how to do i change the value of data from server side?

how to do i change the value of data from server side?

i am trying to set a value from server side in this code. i have a textbox
to enter ticket number and when the ticket is validated and activated, i
want the used property of this particulare ticket to be changed to true.
i have this code :
TicketBLL Tickets = new TicketBLL();
ClientDeviceBLL Devices = new ClientDeviceBLL();
if (String.IsNullOrEmpty(txtTicket.Text))
{
CVUsed.Visible = false;
CVUsed.Enabled = false;
CVMember.Enabled = false;
CVMember.Visible = false;
CVInValid.Enabled = false;
CVInValid.Visible = false;
lblMessages.Text =
MessageFormatter.GetFormattedErrorMessage("You can login using
a Ticket Number.");
txtTicket.Focus();
}
else
{
Ticket = Tickets.GetTicketByTicketNumber(txtTicket.Text);
////// we must enter the value of the correct SN and the
Client ID
Device = Devices.GetClientDeviceBySN(txtSN.Text ,
Convert.ToInt32(txtClientID.Text));
if (Ticket != null)
{
//Correct Ticket number
CVInValid.Visible = false;
CVInValid.Enabled = false;
if (Ticket.Used == true)
{
//ticket was used, internet forbidden
CVUsed.Visible = true;
CVUsed.Enabled = true;
CVMember.Enabled = false;
CVMember.Visible = false;
CVUsed.IsValid = false;
}
else
{
//if exists but not used, Ticket accepted
//check if device is a member if client divices
if (Device != null)
{
//internet access garanteed
CVUsed.Visible = false;
CVUsed.Enabled = false;
CVMember.Enabled = false;
CVMember.Visible = false;
CVUsed.IsValid = true;
CVMember.IsValid = true;
//here is my error.
//ticket.used is not changing in the database so
the next
//time he enters the same ticket number it would go
through
//again.
Ticket.Used = true;
Response.Redirect("http://www.google.com");
}
else
{
//device not member, internet access forbidden
CVMember.Enabled = true;
CVMember.Visible = true;
CVUsed.Visible = false;
CVUsed.Enabled = false;
CVUsed.IsValid = true;
CVMember.IsValid = false;
}
}
}
else
{
//Ticket Number is not valid
CVUsed.Visible = false;
CVUsed.Enabled = false;
CVMember.Enabled = false;
CVMember.Visible = false;
CVInValid.Enabled = true;
CVInValid.Visible = true;
CVInValid.IsValid = false;
}
}
how can i automatically update the ticket.used value in the database?!