C# equivalent construct for Java's instanceOf

[XiaochuanSun]

Hi,
I am new to C#. I am working on a test program in C# to invoke web service for my test case. Is there any C# equivalent construct for Java's instanceof keyword?

[r035198x]

is

http://msdn.microsoft.com/en-us/library/scekt9xw%28v=vs.71%29.aspx