Prime Number between 1 to n | program code | simple prime number code

Prime Number series in vb.net with source code .
in this program i have shown how to write program for
prime number in vb.net using for loop and if .
it is very simple to find out single prime number  but when we comes across prime number
series then its challenge.
in this program i will tell you how to get prime number from 1 to 10 or 1 to n with comments.
just stick with this code later on i will show execution line by line by video

   Public Sub Primenumber()
        Response.Write("Prime number ")
        Dim takeval As Integer
        Dim flag As Integer
        flag = 0
        takeval = txtVal.Text
        Dim i As Integer
        Dim j As Integer
        For i = 2 To takeval

            For j = 2 To (i - 1)

                If i Mod j = 0 Then
                    flag = 0
                    Exit For

                Else

                    flag = 1
                    'Exit For
                End If
            Next j
            If flag = 1 The    
           Response.Write(i)
                Response.Write("</br>")
            End If
        Next i
    End Sub


3 5 7 'will show prime number  between 1 to 10.
you can call primenumber function on button click event also.

TRIGGER IN SQL SERVER 2005 FOR INSERT

ALTER trigger [dbo].[InsertIntoTable]
on [dbo].[stud]
AFTER  Insert
as

Declare @val NVARCHAR(10)
select @val=(select name from inserted)

if (select count(*) from stud where name=@val) > 1
BEGIN
Print 'Data Already Exist'
--ERROR ( 'Data already has enterd' )
ROLLBACK TRAN
END