Populating data from a CSV file to a DataGridView and Retriving data from a DataGridView to CSV

 

Introduction

I had problems finding a decent article that showed how to Populate a Datagridview from CSV file and how to store information from DataGridView to a CSV file.

This article is compilation of two sources from the internet.  First one is http://www.thescripts.com/forum/thread554150.html and the second one is http://www.homeandlearn.co.uk/NET/vbNet.html

Description

There is one Form having default name Form1 

There is one DataGridView named DataGridView1

Two buttons named Button1 and Button2

One Textbox named Textbox1

The csv file contains information as follows (between the inverted commas):

"Dharmit,Male,28,First

Lomesha,Female,26,Second

Jaymit,Male,24,Third

Ambrish,Male,54,First

Chanda,Female,50,Second"

Remove inverted commas if you are copying directly from here

 

The sourcecode behind the form is

SourceCode

Public Class Form1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim fName As String = ""

OpenFileDialog1.InitialDirectory = "c:\temp\"

OpenFileDialog1.Filter = "CSV files (*.csv)|*.CSV"

OpenFileDialog1.FilterIndex = 2

OpenFileDialog1.RestoreDirectory = True

If (OpenFileDialog1.ShowDialog() = Windows.Forms.DialogResult.OK) Then

fName = OpenFileDialog1.FileName

End If

Me.TextBox1.Text = fName

Dim TextLine As String = ""

Dim SplitLine() As String

 

If System.IO.File.Exists(fName) = True Then

Dim objReader As New System.IO.StreamReader(fName)

Do While objReader.Peek() <> -1

TextLine = objReader.ReadLine()

SplitLine = Split(TextLine, ",")

Me.DataGridView1.Rows.Add(SplitLine)

Loop

Else

MsgBox("File Does Not Exist")

End If

End Sub

 

Private Sub SaveGridDataInFile(ByRef fName As String)

Dim I As Integer = 0

Dim j As Integer = 0

Dim cellvalue$

Dim rowLine As String = ""

Try

Dim objWriter As New System.IO.StreamWriter(fName, True)

For j = 0 To (DataGridView1.Rows.Count - 2)

For I = 0 To (DataGridView1.Columns.Count - 1)

If Not TypeOf DataGridView1.CurrentRow.Cells.Item(I).Value Is DBNull Then

cellvalue = DataGridView1.Item(I, j).Value

Else

cellvalue = ""

End If

rowLine = rowLine + cellvalue + ","

Next

objWriter.WriteLine(rowLine)

rowLine = ""

Next

objWriter.Close()

MsgBox("Text written to file")

Catch e As Exception

MessageBox.Show("Error occured while writing to the file." + e.ToString())

Finally

FileClose(1)

End Try

End Sub

 

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

SaveGridDataInFile(Me.TextBox1.Text)

End Sub

End Class

End Source code

If you have any queries e-mail me and I will do my best to help.

cheers