Need to be able to add following formats jpg, gif, png, xls, xlsx, doc, docx, txt,csv, zip

I need to upload the file formats jpg, gif, png, xls, xlsx, doc, docx, txt,csv, zip

So this retouine only handles xlsx


    Shared Sub AddAttachment(ByVal filename As String, ByVal fileContent As Byte(), ByVal interviewID As Integer)

        Dim sql As New StringBuilder()
        sql.Append("INSERT INTO [tbl_dotnet_attachments]([InterviewID],[Filename],[ImageContent],[DateCreated]) ")
        sql.Append("   VALUES ")
        sql.Append(" (@InterviewID,@FileName,@FileContent,GETDATE() )")
        Dim conn As New SqlConnection(ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString)
        Dim cmd As New SqlCommand(sql.ToString(), conn)

        cmd.Parameters.Add("@InterviewID", SqlDbType.Int).Value = interviewID
        cmd.Parameters.Add("@FileContent", SqlDbType.Image).Value = fileContent
        cmd.Parameters.Add("@FileName", SqlDbType.VarChar).Value = filename
        conn.Open()
        cmd.ExecuteNonQuery()
        conn.Close()
        SqlConnection.ClearPool(conn)
    End Sub