delete Sharepoint file using Script Task - vb.net

Question

I need to delete a Sharepoint file using the Script Task from SSIS. In Visual Basic, I've tried using the SPListItemCollection with imports Microsoft.Sharepoint but it doesn't recognize the namespace. I didn't find lots of threads on this subject or what I've found wasn't related with script task, so any help will be really appreciated. Many thanks
Update based on #Hadi answer
Thanks Hadi for your answer. I've given up the idea of using SPListCollection as it seems too complicated. Instead I'm trying to delete the file after it is downloaded from Sharepoint to the local folder. I would need help at the line that actually deletes the file. Here is the code:
Public Sub Main()
Try
' get location of local folder
Dim dir As DirectoryInfo = New DirectoryInfo(Dts.Variables("DestP").Value.ToString())
If dir.Exists Then
' Create the filename for local storage
Dim file As FileInfo = New FileInfo(dir.FullName & "\" & Dts.Variables("FileName").Value.ToString())
If Not file.Exists Then
' get the path of the file to download
Dim fileUrl As String = Dts.Variables("SHP_URL").Value.ToString()
If fileUrl.Length <> 0 Then
Dim client As New WebClient()
If Left(fileUrl, 4).ToLower() = "http" Then
'download the file from SharePoint
client.Credentials = New System.Net.NetworkCredential(Dts.Variables("$Project::UserN").Value.ToString(), Dts.Variables("$Project::Passw").Value.ToString())
client.DownloadFile(fileUrl.ToString() & "/" & Dts.Variables("FileName").Value.ToString(), file.FullName)
Else
System.IO.File.Copy(fileUrl.ToString() & Dts.Variables("FileName").Value.ToString(), file.FullName)
End If
'delete file from Sharepoint
client.(fileUrl.ToString() & "/" & Dts.Variables("FileName").Value.ToString(), file.FullName).delete()
Else
Throw New ApplicationException("EncodedAbsUrl variable does not contain a value!")
End If
End If
Else
Throw New ApplicationException("No ImportFolder!")
End If
Catch ex As Exception
Dts.Events.FireError(0, String.Empty, ex.Message, String.Empty, 0)
Dts.TaskResult = ScriptResults.Failure
End Try
Dts.TaskResult = ScriptResults.Success
End Sub

Answer 1

Update 1 - Delete using FtpWebRequest
You cannot delete file using WebClient class. You can do that using FtpWebRequest class. And send a WebRequestMethods.Ftp.DeleteFile request as mentioned in the link below:
How To Delete a File From FTP Server in C#
It should work with Sharepoint also.
Here is the function in VB.NET
Private Function DeleteFile(ByVal fileName As String) As String
Dim request As FtpWebRequest = CType(WebRequest.Create(fileUrl.ToString() & "/" & fileName), FtpWebRequest)
request.Method = WebRequestMethods.Ftp.DeleteFile
request.Credentials = New NetworkCredential(Dts.Variables("$Project::UserN").Value.ToString(), Dts.Variables("$Project::Passw").Value.ToString())
Using response As FtpWebResponse = CType(request.GetResponse(), FtpWebResponse)
Return response.StatusDescription
End Using
End Function
You should replace the following line:
client.(fileUrl.ToString() & "/" & Dts.Variables("FileName").Value.ToString(), file.FullName).delete()
With
DeleteFile(Dts.Variables("FileName").Value.ToString())
Also you may use the following credentials:
request.Credentials = System.Net.CredentialCache.DefaultNetworkCredentials;
References
How to pass credentials to httpwebrequest for accessing SharePoint Library
How To Delete a File From FTP Server in C#
Downloading all files in a FTP folder and then deleting them
Deleting file from FTP in C#
How To Delete a File From FTP Server in C#
Initial Answer
I was searching for a similar issue from a while, it looks like you cannot delete a Sharepoint file in SSIS using a File System Task or Execute Process Task, the only way is using a Script Task. There are many links online describing this process such as:
how to delete or remove only text files from share point in C# or SSIS script?
Fastest way to delete all items with C#
Deleting files programatically
Deleting all the items from a large list in SharePoint
Concerning the problem that you have mentioned, i think you should make sure that Microsoft.Sharepoint.dll is added as a reference inside the Script Task. If so try using Microsoft.Sharepoint.SPListItemCollection instead of SPListItemCollection.

Answer 2

Thanks #Hadi for your help.
For me it didn't work with FTPWebResponse.
It worked with HttpWebRequest. Here is the script:
Dim request As System.Net.HttpWebRequest = CType(WebRequest.Create(fileUrl.ToString() & "/" & Dts.Variables("FileName").Value.ToString()), HttpWebRequest)
request.Credentials = New System.Net.NetworkCredential(Dts.Variables("$Project::UserN").Value.ToString(), Dts.Variables("$Project::Passw").Value.ToString())
request.Method = "DELETE"
Dim response As System.Net.HttpWebResponse = CType(request.GetResponse(), HttpWebResponse)