Since I am using master pages, I have a button in a formview in a contentplaceholder. I want the visibility of the button false if the value of a textbox in the same formview is not "AO" . Which event do I handle this? I tried every event available for the formview. Here is my code.

Dim ct As ContentPlaceHolder = CType(Master.FindControl("contentplaceholder1"), ContentPlaceHolder)
Dim fv1 As FormView = CType(ct.FindControl("formview1"), FormView)
Dim tbfund As TextBox = CType(fv1.FindControl("fundTextBox"), TextBox)
Dim btn2 As Button = CType(fv1.FindControl("button2"), Button)
If Not tbfund.Text = "AO" Then
btn2.Visible = False
End If

Is this something you want to have happen on the client or the server?

As you type into a textbox some client side events fire (keydown, keypress, keyup, maybe more). After you exit the textbox (if the text has changed) the client side textChanged event fires. This is the client side event that is tied to a postback when the control is set for AutoPostback so you'll only get a server side TextChanged event on a text box when the user exits the textbox. If you want to have some dynamic action take place based on a changing value of a textbox you'll need to do some client side scripting.

-Peter

Peter,
On the page is a gridview and a formview at the bottom. the formview shows a selected item from the grid. The formview only shows in edit mode. I need for a button, which goes and gets a new Travel Authorication number, to be visible=false if
1. NOT fundtextbox.text ="AO" OR
2. TATextbox.text is not null.
So, when the formview loads, on which event do I run the above logic to make the button visible or invisible? all these controls and button are inside a formview which is inside a contentplaceholder
thanks
Milton

Will the values driving these conditions be changed by the user between postbacks? As I described before this will have a significant influence on the solution.

-Peter

NO. These values are already there. If the fund is already "AO" and the TA(Travel Authorization) textbox is empty, then the button can show, IE be visible so the user can click the button and generate a new TA. That is all I want to happen. display the Get TA button or hide the Get TA button.

I'm not sure what the problem is. Your code looks ok. However, it seems like there is a lot more than needs to be there. Why all the "FindControl" calls? The button and text box on the form should be directly accessible by their instance names.

-Peter