Hi. Im doing a login form with decryption. So i did a modification to my login code for decryption. Before i did the decryption, the login form is functioning well. But after i edit it to insert decryption code it suddenly cannot connect to database. Im still a begginer in vb.net so maybe there is something that Im missing because there is no error in the code so I dont know where did I do wrong.

Here i put decryption code(just in case) and my login code
Decryption Code

 Private Function Decrypt(ByVal cipherText As String) As String
        'Firstly the encrypted text i.e. cipher text is converted into bytes and then similar to the encryption process here too we will generate Key and IV using the derived bytes and the symmetric key.
        'Using MemoryStream and CryptoStream the cipher text is decrypted and written to byte array and finally the byte array is converted to Base64String and returned, which is the decrypted original text.
        Dim EncryptionKey As String = "ABCDEFGHIJKLMNOPQRSTUVWXYZ123456789"
        Dim cipherBytes As Byte() = Convert.FromBase64String(cipherText)
        Using encryptor As Aes = Aes.Create()
            Dim pdb As New Rfc2898DeriveBytes(EncryptionKey, New Byte() {&H49, &H76, &H61, &H6E, &H20, &H4D, _
             &H65, &H64, &H76, &H65, &H64, &H65, _
            encryptor.Key = pdb.GetBytes(32)
            encryptor.IV = pdb.GetBytes(16)
            Using ms As New MemoryStream()
                Using cs As New CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write)
                    cs.Write(cipherBytes, 0, cipherBytes.Length)
                End Using
                cipherText = Encoding.Unicode.GetString(ms.ToArray())
            End Using
        End Using
        Return cipherText

Login Code**

 Private Sub SubmitButton4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SubmitButton4.Click
        'Check ...