Problem validating multiple user

[stubby915]

I am currently working on a project for school in which I am trying to implement a multi user login on one of my forms. I have an internal database connected in which one of my tables contains the user-names and passwords. I have a For/each loop to search the table for a matching username/password before allowing access to next form. The problem is even if the username/password is correct, my message box still appears to notify of invalid credentials, but still allows access to other form. The problem only occurs when I implement two For/each loops. With one, code works fine. Can any one see what might be wrong? Thanks

        Dim h As New AdminActionForm
        Dim i As New UserActionForm
        For Each row As EmployeeDBDataSet1.UserName_PasswordsRow In EmployeeDBDataSet1.UserName_Passwords
            If row.Password = txtLoginPassword.Text And row.UserName = txtLoginUserName.Text _
                And row.Administrator = True Then
                Me.Hide()
                h.Show()
                Exit For
            ElseIf row.Password <> txtLoginPassword.Text Or row.UserName <> txtUserName.Text Then
                MessageBox.Show("Invalid UserName or Password", "Incorrect Information", _
                MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
                Exit For
            End If
            'End If
        Next

        For Each row As EmployeeDBDataSet1.UserName_PasswordsRow In EmployeeDBDataSet1.UserName_Passwords
            If row.Password = txtLoginPassword.Text And row.UserName = txtLoginUserName.Text _
                And row.Administrator = False Then
                Me.Hide()
                h.Show()
                Exit For
            ElseIf row.Password <> txtLoginPassword.Text Or row.UserName <> txtUserName.Text Then
                MessageBox.Show("Invalid UserName or Password", "Incorrect Information", _
                MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
                Exit For
            End If
            'End If
        Next]