SQL Server Triggers- New Person -Help Required-Urgent

Please help me in sorting out my Problem Providing me the solution .
My Problem is
I have a master table with Primary key on ID field (PatientID-(Patient-Table)) and it is an Identity field
And My child table has the same ID field(PatientID-(PatientDetails-Table)) and it has the relationship set
And the child table has its own Primary key of its own ID field(PatientdetailsID).
What I want is as soon as enter row of data into the master table (Patient-Table)and click save on my front end application(Which is ASP.Net web application)
I want to update Child Table’S (PatientDetails)ID field ( ie.,PaientID in the PatientDetailsTable) in the  Child Table   which relates the parent table ,by doing so I want to  update the Primary key field (ie.,PatientDetailsID)  & ForeignKey Field (PatientID)of the child table and to create row  in the child table  with two columns .(PatientID,&PatientDetailsID)
What I want to achieve is in my ASP.net Application as soon as I enter Master table
I want to Edit Child tables (about 15) one by one like a Wizard pages which will have The ID Field(PatientID) same in all my wizard pages .
I want to know whether I can incorporate triggers if so in which table (is it in Patient or PatientDetails) and I will be grateful If anyone gives the Script to-do  so.I am also providing my two table sripts.
Sripts:CREATE TABLE [dbo].[Patient](      [PatientID] [int] IDENTITY(1,1) NOT NULL,      [Date] [smalldatetime] NULL,      [UserID] [int] NULL,      [FirstName] [varchar](40) NOT NULL,      [Surname] [varchar](30) NOT NULL,      [DOB] [datetime] NULL,      [Age]  AS (floor(datediff(day,[DOB],getdate())/(365.25))),      [Sex] [varchar](10) NULL,      [Occupation] [varchar](30) NULL,      [Ethinicity] [varchar](60) NULL,      [HomeTel] [varchar](15) NULL,      [Mobile] [varchar](15) NULL,      [varchar](40) NULL,      [AddressLine1] [varchar](30) NULL,      [Line2] [varchar](30) NULL,      [Line3] [varchar](30) NULL,      [City] [varchar](20) NULL,      [PostCode] [varchar](15) NULL, CONSTRAINT [PK_Patient] PRIMARY KEY CLUSTERED (      [PatientID] ASC)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]) ON [PRIMARY] GOSET ANSI_PADDING OFFGOALTER TABLE [dbo].[Patient]  WITH CHECK ADD  CONSTRAINT [FK_Patient_User] FOREIGN KEY([UserID])REFERENCES [dbo].[User] ([UserID])GOALTER TABLE [dbo].[Patient] CHECK CONSTRAINT [FK_Patient_User] CREATE TABLE [dbo].[PatientDetails](      [PatientID] [int] NOT NULL,      [PatientDetID] [int] IDENTITY(1,1) NOT NULL,      [Date] [smalldatetime] NULL,      [NHSNumber] [varchar](12) NULL,      [HospitalRefID] [varchar](10) NULL,      [Ovaries] [varchar](15) NULL,      [ReportFromGP] [image] NULL,      [LMP] [datetime] NULL,      [DateStopped] [datetime] NULL,      [Comment] [varchar](150) NULL, CONSTRAINT [PK_PatientDetails_1] PRIMARY KEY CLUSTERED (      [PatientDetID] ASC)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY] GOSET ANSI_PADDING OFFGOALTER TABLE [dbo].[PatientDetails]  WITH CHECK ADD  CONSTRAINT [FK_PatientDetails_Patient] FOREIGN KEY([PatientID])REFERENCES [dbo].[Patient] ([PatientID])GOALTER TABLE [dbo].[PatientDetails] CHECK CONSTRAINT [FK_PatientDetails_Patient] 
I want to incorporate this through database level .
I am using SQL Server2005-Express
Although  Iam using ASP.net C# I am new and I will not be able to do this in my front end.
Please help me wth the solution.
thanks

rameshs_2000