Duplicate Record Inserted. Weird.........

1 Protected Sub btnSubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSubmit.Click
2 Dim sqlStr As String
3 Dim sqlStr2 As String
4 Dim myConnection As MySqlConnection = Nothing
5 Dim myCommand As MySqlCommand = Nothing
6 Dim myConnection2 As MySqlConnection = Nothing
7 Dim myCommand2 As MySqlCommand = Nothing
8 Dim myReader As MySqlDataReader = Nothing
9 Dim IC As String
10
11 IC = txtIC1.Text + "-" + txtIC2.Text + "-" + txtIC3.Text
12
13
14 Try
15 sqlStr2 = "SELECT * FROM User WHERE uLogin='" & txtUserName.Text.Trim() & "'"
16
17 ' Connection
18 myConnection2 = New MySqlConnection(ConfigurationManager.ConnectionStrings("dbConnection").ToString())
19 myConnection2.Open()
20 ' Command
21 myCommand2 = New MySqlCommand(sqlStr2, myConnection2)
22 ' Reader
23 myReader = myCommand2.ExecuteReader()
24 Catch ex As Exception
25 ' Exception Error Here
26 Response.Write(Err.Number & " - " & Err.Description)
27
28 End Try
29 ' Checking
30 If myReader.Read() Then
31
32
33 Label2.Text = "Username already exist. Please choose another username"
34 Label3.Text = "*"
35
36 Else
37
38 Try
39
40
41 sqlStr = "INSERT INTO userapplication(uaName,uaIC,) VALUE (?uName,?uIC )"
42
43
44
45 ' Connection
46 myConnection = New MySqlConnection(ConfigurationManager.ConnectionStrings("dbConnection").ToString())
47 myConnection.Open()
48 'Command
49 myCommand = New MySqlCommand(sqlStr, myConnection)
50
51 myCommand.Parameters.AddWithValue("?uName", txtName.Text)
52 myCommand.Parameters.AddWithValue("?uIC", IC)
53
54
55 myCommand.ExecuteNonQuery()
56 myConnection.Close()
57 Response.Redirect("Register.aspx", False)
58
59 Catch ex As Exception
60 ' Exception Error Here
61 Response.Write(Err.Number & " - " & Err.Description)
62 Finally
63 ' Clean Up
64 If Not IsNothing(myCommand) Then
65 myCommand.Dispose()
66 End If
67 '
68 If Not IsNothing(myConnection) Then
69 If myConnection.State = Data.ConnectionState.Open Then myConnection.Close()
70 myConnection.Dispose()
71 End If
72 End Try
73
74
75 End If
76
77 End Sub
78
79
 

 above is my code for the user registration page.the code that i bold,which with number 55,56 and 57,are where the problem occur.

when it run,it run 55, then 57,then back to 55, then 57 again

means that my db hav duplicate record being insert

anyone know how to solve this problem?