Exception Error - Incorrect Syntax Near '('. Inline UPDATE Command

Hi,

Here's the code I've used to try and update a new user's IP Address to a Table called Customer who's key field in the UserId:

Getting the Exception Error   "Incorrect Syntax near'('. "                 Any ideas?

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(); //This gets the active user if there is someone logged in...

Guid UserId = (Guid)_membershipUser.ProviderUserKey; //This gets the userId for the currently logged in user

string IPAddress = Request.UserHostAddress.ToString();//This gets the IPAddress of the currently logged in user

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

using (System.Data.SqlClient.SqlConnection con =new System.Data.SqlClient.SqlConnection(cs))

{

con.Open();

System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand();

cmd.Connection = con;

cmd.CommandType = System.Data.CommandType.Text;

 

cmd.CommandText = "UPDATE Customer SET(IP_Address = @IP_Address) WHERE (UserId = @UserId)";

cmd.Parameters.Add("@UserId", System.Data.SqlDbType.UniqueIdentifier).Value = UserId;

cmd.Parameters.Add("@IP_Address", System.Data.SqlDbType.Char, 15).Value = IPAddress;

cmd.ExecuteNonQuery();

 

con.Close();

}

 Thanks.