Question

I need to delete some rows from csv file based on a column value. Here is my sample.csv file

Name     no     date        sal  
abc      12     06/06/10    2345  
xyz      11     06/06/10    2321  
qwe      10     05/07/10    4323  
asd      10     05/07/10    3221  

In my vb.net winforom application, I have to read this file and need to delete the rows related to 06/06/10 date column values then write the remaining rows into new.csv file. So far my program works on reading whole data present in the file. Any suggestion on this please?

Here is my code:

 Dim ioFile As New System.IO.StreamReader("C:\sample.csv")      
 Dim ioLine As String
 Dim ioLines As String      
 ioLine = ioFile.ReadLine     
 ioLines = "ID,Name,Number,Amount"
 ioLines &= vbCrLf & ioLine 
 While Not ioLine = ""         
    ioLine = ioFile.ReadLine         
    ioLines = ioLines & vbCrLf & ioLine      
 End While     
 Dim ioWriter As New System.IO.StreamWriter("C:\new.csv")     
 ioWriter.WriteLine(ioLines)     
 ioFile.Close()     
 ioWriter.Close()

Answer 1

Hopefully this will get you started (I assumed fixed column widths as that appears to be the case from your sample file):

Const dateColumnOffset As Integer = 16 ' I hope I counted that right
Const dateColumnWidth As Integer = 8
Using writer As StreamWriter = File.CreateText("new.csv")
    For Each line As String In File.ReadLines("sample.csv")
        Dim recordDate As String = line.Substring(dateColumnOffset, dateColumnWidth)
        If recordDate <> "06/06/10" Then
            writer.WriteLine(line)
        End If
    Next
End Using