How can I update a row in a DataTable in VB.NET?

I have the following code:

Dim i As Integer = dtResult.Rows.Count
For i = 0 To dtResult.Rows.Count Step 1
    strVerse = blHelper.Highlight(dtResult.Rows(i).ToString, s)
    ' syntax error here
    dtResult.Rows(i) = strVerse 
Next

I want to add a strVerse to the current row.

What am I doing wrong?