UPDATE Statement Syntax Help Required C# && SqlDataSource Control

Hi,

I need to UPDATE the IP Address of a newly created user into a table (the value is currently set to default - " Not Available"), and I really dont know the syntax required to do this. So far I've derived all the variables needed using the following code:

protected void ContinueButton_Click(object sender, EventArgs e)

{

//Get the ip address and put it into the customer table - (the instance of this user now exists)

MembershipUser _membershipUser = Membership.GetUser();

Guid UserId = (Guid)_membershipUser.ProviderUserKey;<--------------------------------------------------------------I can see the UserId here if I pause the prog

SqlDataSource customerDataSource = new SqlDataSource();

customerDataSource.ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ToString();

customerDataSource.UpdateParameters.Add("IPAddress", Request.UserHostAddress.ToString());<---------------------------------------I can see the IPAddress here

customerDataSource.UpdateCommandType = SqlDataSourceCommandType.Text;

 what next

I've not got a clue as to what to write next. There is a try / catch statement after this using :

rowsAffected = customerDataSource.Update();

which remains at 0 no matter what I try.

Any help greatly appreciated.