If you're like me then you work for a large corp that pushes SharePoint like its delivered from God. You also have no love for SharePoint and you do everything in your power to prevent navigating to it altogether. You are also having nightmares of off the wall requests coming from several departments, and you have a bucket near your desk that you can go to quickly when you have to vomit.

Anyway...what am I getting at here...

Oh yes...

I have created code that will
A) Load up only SubSite Titles from the site root they have access to (preventing access violations and ensuing exceptions)
B) Load up all lists from selected SubSite
C) Load up all fields from selected List
D) Load up all data from the selected list
E) Add columns to a DataTable from the list field collection
F) Add data as rows to the datatable

This is much different than many examples out there where it uses the least amount of resources, easier to read, faster, and in VB.NET
It requires 2 comboboxs (Set DropDownStyle to DropDownList so people cant type anything manually) and a DataGridView

If you're interested in learning how to push any changes you make to the data from this DGV to the actual site, I have method madness for that too...

Imports Microsoft.SharePoint.Client
Public Class FormSPList
    Private Sub FormSPList_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Dim path As String = "http://intranet"
        Dim clientContext = New ClientContext(path)
        Dim oWebsite = clientContext.Web
        Dim result As WebCollection = oWebsite.GetSubwebsForCurrentUser(New SubwebQuery())
        clientContext.Load(result, Function(n) n.Include(Function(o) o.Title, Function(o) o.ServerRelativeUrl))

        For Each orWebsite In result
            ComboBoxSites.Items.Add(path & orWebsite.ServerRelativeUrl)
    End Sub

    Private Sub ComboBoxSites_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBoxSites.SelectedIndexChanged

        Dim context As ClientContext = New ClientContext(ComboBoxSites.Text)
        Dim web As Web = context.Web
        context.Load(web.Lists, Function(lists) lists.Include(Function(list) list.Title, Function(list) list.Id))

        For Each list As List In web.Lists

    End Sub

    Private Sub ComboBoxLists_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBoxLists.SelectedIndexChanged
        Dim Dtable As New DataTable

        Dim context As ClientContext = New ClientContext(ComboBoxSites.Text)
        Dim web As Web = context.Web
        Dim list = web.Lists.GetByTitle(ComboBoxLists.Text)
        Dim query As CamlQuery = CamlQuery.CreateAllItemsQuery()
        Dim AllItems As ListItemCollection = list.GetItems(query)

        For Each f As Field In list.Fields
            Dtable.Columns.Add(f.InternalName, GetType(System.String))

        For Each RowItem As ListItem In AllItems
            Dim dr As DataRow = Dtable.NewRow
            For i As Integer = 0 To list.Fields.Count - 1
                dr(i) = RowItem.FieldValues.Values(i)

        DGVList.DataSource = Dtable
    End Sub
End Class