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Modal Popup does not work with ScriptManager.RegisterStartupScript

Posted By:      Posted Date: September 20, 2010    Points: 0   Category :ASP.Net

Ok, here is my problem, I am using a masterpage that contains a javascript script (does not matter what it does) and on each page under that masterpage I am registering that script to run on page load. On the page under the masterpage, I am calling a modalpopupextender to display on a button click. Now, if I disable the register startupscript, the popup extender works fine, if I register the startup up script it does not

here is the script regster call

ScriptManager.RegisterStartupScript(Me, Me.GetType(), "addscript", "miscscript()", True)

I have also tried this

Page.ClientScript.RegisterStartupScript(Me.GetType(), "addScript", "miscscript()", True)

I had this working fine using the second example when using .net 4 and the Ajax toolkit for 4 but I am now having to rollback to 3.5 due to a vendor requirement.

any help would be appreciated as I am completely stumped by this behavior.

Here is a little bit of extra info:

If I put the script in page and not in the masterpage and just run with a window.onload, both work fine, which is why I have figured that it must be something that I am doing with the registration of the script.

When I say it does not matter what I put as the sript, I mean, it can be a complex element property adjustment or a simple alert, n

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