The VB 'with' keyword is currently converted by taking the 'with' param and placing it infront of any dots, eg:

With myTextBox
.Text = "Text"
.ForeColor = Colors.Blue
End With

becomes:
myTextBox.Text = "Text";
myTextBox.ForeColor = Colors.Blue;

Which is fine for trivial cases, however if the 'With' parameter does something more interesting, this conversion is not valid, eg:

With myListView.Items.Add(itemText)
.SubItems.Add(subItem1Text)
.SubItems.Add(subItem2Text)
End With

becomes:

myListView.Items.Add(itemText).SubItems.Add(subItem1Text);
myListView.Items.Add(itemText).SubItems.Add(subItem2Text);

which is clearly going to add two items with one subitem instead of one item with two subitems.

The VB 'with' clause is short-hand for creating a temporary variable and then using that, so the conversion should be:

var temp1 = myListView.Items.Add(itemText);
temp1.SubItems.Add(subItem1Text);
temp1.SubItems.Add(subItem2Text);

(which with c# 3.0 is now possible)