[RESOLVED] Why is it so hackable?

[vbcooler]

why is this code so easy to hack? my friend told me if i do this to may app ppl can just find out whats the password or username very easy?

Private Sub cmdlogin_Click()
If txtusername.Text = "TestUser" And txtpassword.Text = "TestPassword" Then
frmloged.Show
Unload Me
Else
MsgBox "The UserName Or Password is not correct!", vbExclamation + vbOKOnly, "Error!!!"
End If
End Sub