Why Isnt My Insert Method Working

hi, i am trying to insert my values into the database, however the code i have doesnt seem to work. i have looked at old posts, one suggested to take away my code behind code where the insert method has been written. i did try this but it does not seem to work, can some please help me sort out this problem and advice or examples of what i need to do will be very much appreciated, thank you. the following is the code i have

code behind code

'Save vlues into database.

If IsPostBack = False ThenDim test As SqlDataSource = New SqlDataSource()

test.ConnectionString = ConfigurationManager.ConnectionStrings("ConnectionString").ToString()

test.InsertCommand = "INSERT INTO [UserQuiz] ([QuizID], [DateTimeComplete], [CorrectAnswerCount], [UserName]) VALUES (@QuizID, @DateTimeComplete, @CorrectAnswerCount, @UserName)"test.InsertParameters.Add("QuizID", Session("QuizID").ToString())

test.InsertParameters.Add("DateTimeComplete", DateTime.Now.ToString())test.InsertParameters.Add("CorrectAnswerCount", "12")test.InsertParameters.Add("UserName", User.Identity.Name)

test.Insert()

End If

 

when i run the program i get this error
Cannot insert the value NULL into column 'UserQuizID', table 'C:VISUAL STUDIO 2008WEBSITESquizAPP_DATAQUIZ.MDF.dbo.UserQuiz'; column does not allow nulls. INSERT fails.
The statement has been terminated.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Data.SqlClient.SqlException: Cannot insert the value NULL into column 'UserQuizID', table 'C:VISUAL STUDIO 2008WEBSITESquizAPP_DATAQUIZ.MDF.dbo.UserQuiz'; column does not allow nulls. INSERT fails.
The statement has been terminated.

Source Error:





Line 26: test.InsertParameters.Add("UserName", User.Identity.Name)
Line 27:
Line 28: test.Insert()
Line 29:
Line 30: End If