i m putting corect id 

but i really dont knw wht the prb is????

Dim objTextBox As TextBox = DirectCast(PageContentSection.FindControl(id ), TextBox)
Dim str As String = objTextBox.Text

showing 1 error

Object reference not set to an instance of an object.

i dont knw y,now i m using id=ctl00_InnerContent_1004

still its not showing ne thing