For usercontrols that use the outputcache directive, how do you access properties on the control after it is cached? If it doesn't really exist on the page? I tried out the following code and it gave a null reference error the second time the button was clicked:

protected void Button1_Click(object sender, EventArgs e)
{
System.Diagnostics.Debug.WriteLine(WebUserControl1 .TextBox1Contents);

}

You can't. Output caching caches the output (e.g. the generated HTML) which is then reused as-is.

If you need access to the control, you need to disable output caching.

Cheers,

Imar

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Imar Spaanjaars
http://Imar.Spaanjaars.Com
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Author of Beginning ASP.NET 4.5 : in C# and VB, Beginning ASP.NET Web Pages with WebMatrix
and Beginning ASP.NET 4 : in C# and VB.
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