How do I access child gridview on rowcommand event?

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VB

Hi y'all,

I'm still new on using Vb.net and its pretty easy to handle the main gridview rowcommand event. However, i still dont know how to access the child gridview row command. whenever I use the keyword 'AddHandler gvFiles.RowCommand, AddressOf gvFiles_RowCommand' it will cause an error 'does not have signature compatible with delegate' The codes are as below.

Private Sub GridView1_RowDataBound(sender As Object, e As GridViewRowEventArgs) Handles GridView1.RowDataBound
        If e.Row.RowType = DataControlRowType.DataRow Then
            Dim lbltype As Label = e.Row.FindControl("lblType_HWSW")
            Dim LinkCalendar As LinkButton = e.Row.FindControl("LinkCalendar")

            If (lbltype.Text = "sw") Then
                LinkCalendar.Visible = False
            End If

            Dim filePaths() As String = Directory.GetFiles(("C:\Uploads"))
            Dim files As List(Of ListItem) = New List(Of ListItem)
            For Each filePath As String In filePaths
                files.Add(New ListItem(Path.GetFileName(filePath), filePath))
            Next

            Dim gvFiles As GridView = e.Row.FindControl("GridView2")
            AddHandler gvFiles.RowCommand, AddressOf gvFiles_RowCommand 'this line is causing me an error and unable to access gvFiles_rowcommand below. Obviously I did something wrong.

            gvFiles.DataSource = files
            gvFiles.DataBind()

        End If
    End Sub

Private Sub gvFiles_RowCommand(sender As Object, e As GridViewRowEventArgs)
        Dim filePath As String = CType(sender, LinkButton).CommandArgument
        Response.ContentType = ContentType
        Response.AppendHeader("Content-Disposition", ("attachment; filename=" + Path.GetFileName(filePath)))
        Response.WriteFile(filePath)
        Response.End()
    End Sub

sorry for my bad English and hope someone out there can help me.