Convert Excel file to *.CSV

Option Explicit
Dim rowcount As Long, filepath As String
Sub convertoCSV()
Application.ScreenUpdating = False
Application.DisplayAlerts = False
    rowcount = ThisWorkbook.Sheets(1).Range("A1").End(xlDown).Row
    With Application.FileDialog(msoFileDialogFolderPicker)
            .Title = "Select a path to store file"
            If .Show = True Then
                filepath = .SelectedItems(1) & "\"
                'converting into text format
                ThisWorkbook.Sheets(1).Range("A:A").NumberFormat = "@"
                ThisWorkbook.SaveAs Filename:=filepath & "Somu.csv", FileFormat:=xlCSV, CreateBackup:=False
         
            Else
                MsgBox "Folder for *.CSV file not selected"
            End If
 
    End With


End Sub

https://drive.google.com/file/d/0B23eJ2xd9ODyOVZPSHUtSDBkZ2M/edit?usp=sharing