Which control of Ajax control toolkit populates matching list upon entering characters in a text box?

AutoCompleteExtender.

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What is SAML?

Security Assertion Markup Language.

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How will declare a one way communication method in a ASP.NET Webservice?

[SoapDocumentMethod(OneWay=true)]
[WebMethod()]
public void AOneWayComm()
{
//
}

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Visual Studio 2010 Beta 2

you can download Visual Studio 2010 Beta 2 from the following location,

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How will you disable personalization in ASP.NET Web Parts?

By using the attribute personalization-enabled as given in the below example,
<asp:webpartmanager runat="server" id="wpm1"
personalization-enabled="false" />

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