Renaming Master Page Inherited Page Control Names Using VB on Render Event

Imports System.IO

Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)
Dim _html As New StringWriter()
Dim _render As New HtmlTextWriter(_html)
MyBase.Render(_render)
Dim outPut, result As String
If (_html.ToString().Contains("input type=""hidden""")) Then ' Add < 'before ' input word
outPut = _html.ToString().Replace("name=""ctl00$PageMainContentHldr$", "name=""").Replace("id=""ctl00_PageMainContentHldr_", "id=""")
result = outPut.Replace("name=""btnSubmit", "name=""ctl00$PageMainContentHldr$btnSubmit""").Replace("id=""btnSubmit", "id=""ctl00_PageMainContentHldr_btnSubmit""")
writer.Write(result)
End If
'btnSubmit.RenderControl(writer)
End Sub