How can I combine two datagridview? - vb.net

Question

I'm new to VB.net. I want to combine two datagridviews, I get those two data from a CSV file. For example I have Datagridview1:
Dim sr As System.IO.StreamReader = Nothing
Dim dt As New DataTable
Try
readFileName = "LNU010F" & "_" & dateParam.ToString("MM-dd-yyyy") & ".csv"
sr = New System.IO.StreamReader("C:\Documents and Settings\ucpb\Desktop\Sample CSV data\" + readFileName)
Dim newline() As String = sr.ReadLine.Split("|"c)
dt.Columns.AddRange({New DataColumn(newline(11)), New DataColumn(newline(48))})
While (Not sr.EndOfStream)
newline = sr.ReadLine.Split("|"c)
Dim newrow As DataRow = dt.NewRow
newrow.ItemArray = {newline(11), newline(48)}
dt.Rows.Add(newrow)
End While
DataGridViewCSV1.DataSource = dt
This is what I get from the first code.
http://i.stack.imgur.com/QaJZ1.png
I have Datagridview2:
Dim delimeter As String = txtDelimiter.Text
Dim fileReader As System.IO.StreamReader = Nothing
Dim dt As New DataTable
Try
fileName = txtName.Text & "_" & dateParam.ToString("MM-dd-yyyy")
readFileName = txtName.Text & "_" & dateParam.ToString("MM-dd-yyyy") & ".csv"
fileReader = New System.IO.StreamReader("C:\Documents and Settings\ucpb\Desktop\Sample CSV data\" + readFileName)
Dim readColumn As String = fileReader.ReadLine
Dim splitColumn As String() = readColumn.Split(delimeter)
For Each arr As String In splitColumn
dt.Columns.Add(arr)
Next
Dim readRow As String = fileReader.ReadLine
Dim splitRow As String()
While readRow <> ""
splitRow = readRow.Split(delimeter)
dt.Rows.Add(splitRow)
readRow = fileReader.ReadLine()
End While
DataGridViewCSV2.DataSource = dt
This is what I get from the second code.
http://i.stack.imgur.com/r0SmT.png
What I want is to add the UID(Datagridview1) at the end of the Datagridview2. Acctno is the key, Datagridview2 should have the same UID as in the first datagridview because the data is not properly arranged in the datagridview2. Any answer would be appreciated. Thank you.