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Short answer with difficulties.<br />
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A model window works by 'poping' up a window and as we know this is bad in the world of web programming with all the popup blockers around. If you can always have the message in-line on the page.<br />
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Are you displaying something or are you just looking for a confirmation?<br />
<br />
If you must have a popup then look at &nbsp;AjaxControlToolkit ModalPopup <a href="http://www.asp.net/AJAX/AjaxControlToolkit/Samples/ModalPopup/ModalPopup.aspx" rel="ugc">http://www.asp.net/AJAX/AjaxControlToolkit/Samples/ModalPopup/ModalPopup.aspx</a>
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I'm actually using asp.net in sharepoint. &nbsp;I'm new to ASP.net. &nbsp;The ajax toolkit looks cool. - Thanks
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There are a few extra things to think about with Ajax and SharePoint (It is only really only support from SP1)<br />
<br />
Have a search on the web e.g. <a href="http://weblogs.asp.net/scottgu/archive/2007/02/20/asp-net-ajax-and-sharepoint.aspx" rel="ugc">http://weblogs.asp.net/scottgu/archive/2007/02/20/asp-net-ajax-and-sharepoint.aspx</a>&nbsp;for links on how to install it.<br />
<br />

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More importantly<br />
<a href="http://sharepoint.microsoft.com/blogs/mike/Lists/Posts/Post.aspx?ID=3" rel="ugc nofollow">http://sharepoint.microsoft.com/blogs/mike/Lists/Posts/Post.aspx?ID=3</a>
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How do I create a dialog box in ASP.net? &nbsp;(I am using c# code behind)
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How do I create a dialog box in ASP.net?  (I am using c# code behind)

Short answer with difficulties.

A model window works by &#39;poping&#39; up a window and as we know this is bad in the world of web programming with all the popup blockers around. If you can always have the message in-line on the page.

Are you displaying something or are you just looking for a confirmation?

If you must have a popup then look at  AjaxControlToolkit ModalPopup http://www.asp.net/AJAX/AjaxControlToolkit/Samples/ModalPopup/ModalPopup.aspx

I&#39;m actually using asp.net in sharepoint.  I&#39;m new to ASP.net.  The ajax toolkit looks cool. - Thanks

There are a few extra things to think about with Ajax and SharePoint (It is only really only support from SP1)

Have a search on the web e.g. http://weblogs.asp.net/scottgu/archive/2007/02/20/asp-net-ajax-and-sharepoint.aspx for links on how to install it.



More importantly
http://sharepoint.microsoft.com/blogs/mike/Lists/Posts/Post.aspx?ID=3

Modeless/modal dialog box

The successor to Active Server Pages, ASP.NET websites utilize the .NET framework to produce dynamic, data and content-driven web applications and services. ASP.NET code can be written using any .NET supported language. As of 2009, ASP.NET can also apply the Model-View-Controller (MVC) pattern to web applications