DB/Reporting :: Seeking Item In Table Column?

I am trying seek by looping thru a table for the closest match to a search item.

The following code works to a degree. It gets me within say 20 records of the target. I think it works somewhat but it may not be at all.

Code:
Private Sub Find_Item_In_Column(ByVal Search_Field As String)
'Pass a field name to do a string search on
Dim Find_Item As String = InputBox("Enter an Image File Name")

[Code]....

I used the data wizard to establish the connection and I am using VB 2008 Express.

In this case the data field will be a file name and it will be unique. Since the search for string will be a partial of what a file name might be. My expectation is that INCR will match the data row and can then be used to position the TrainImageBindingSource. So far it gets me close, but I am wondering if it is really working at all. I would like to arrive at the closest match (up or down one) found.

Can any one see any glaring errors or point me to an example(s) of similar code snippets?