Assign A Variable Based Upon Query Results...how To Do It?

I have the following code which is incomplete.  Where it says:
 txtVendorID =
I need it to equal the results of the field VendorID from my query...here is my code.  What do I need to add there?

 

Dim cmdSelect As SqlCommand
Dim intRecordID
intRecordID = Request.QueryString("RecordID")
strConn = ConfigurationManager.AppSettings("conn")
conn = New SqlConnection(strConn)
cmdSelect = New SqlCommand("spMfgRepListAddaspxByRecordID", conn)
cmdSelect.CommandType = CommandType.StoredProcedure
cmdSelect.Parameters.AddWithValue("@RecordID", intRecordID)
conn.Open()cmdSelect.ExecuteReader()
txtVendorID.Text =
conn.Close()