How To Login on website? Password as value not accepted - vb.net

Question

I've looked at many examples on how to log in to a website using vb. But somehow it keeps saying the password is incorrect.
Let me explain:
I'm trying to log in to this website using vb. I have managed to fill in the username and the password using
wb1.Document.GetElementById("Username").SetAttribute("Value", "myusername")
wb1.Document.GetElementById("Password").SetAttribute("Value", "mypassword")
I can see them being filled in, but upon clicking on the login button it says the password in incorrect. When I try to fill in the password by hand (username by program) and click the button it does work.
The difference between the two instances? When I do it manually the letters I type become dots. But when I do it via my program the letters do not change but remain letters. I think this is part of the problem, but I'm not entirely sure.
I've tried to change other items as well such as OuterHTML from the element Password. I could see which items were adjusted when I manually entered the password. And then I used those values. This didn't work. But then again, it was hard to see what exactly changed, so maybe I missed something.
One thing I noticed while doing to was when I manually entered the password Value was changed to "". Should I put my password in a different attribute? I'm guessing the password should be send encoded to the server?
This is the code for the password field on the website
<div class="jNiceInputWrapper jNiceSafari FieldPosition col2">
<div class="jNiceInputInner">
<input type="password" name="Password" id="Password" class="jNiceInput" placeholder="Wachtwoord" onkeypress="return SubmitOnEnter(this,event)" />
</div>
</div>
I really hope someone can help me with this problem. I've been working on it all day and just can't figure it out.
EDIT:
Thanks to Mr CoDeXeR I finally figured it out!
The code that solved the problem:
wb1.Document.All("Username").SetAttribute("value", "myusername")
wb1.Document.All("Password").SetAttribute("value", "mypassword")
Dim elements As HtmlElementCollection = (wb1.Document.All.GetElementsByName("Password"))
For Each element As HtmlElement In elements
element.InnerText = "mypassword"
Next
Removing either the setattribute value or the innertext will lead to failure.

Answer 1

Try this, don't use GetElementsByID, use Document.All instead. You want to pass the element's name attribute value to all, you may be just missing some of them...
wB1.Document.All("Username").SetAttribute("value", Username)
wB1.Document.All("Password").SetAttribute("value", Password)
Let me know how this works out for you
EDIT
Upon looking at this more, we can't use the ways we tried since it's a masked input. Instead we can loop through the document and set the inner text of that element...
' Loop through elements until the element is found
Dim elements As HtmlElementCollection = wB1.Document.All.GetElementsByName("Password")
For Each element As HtmlElement In elements
element.InnerText = "your password"
Next