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    <p>Generally, data stored via <code>CallContext.SetData</code> is considered to be thread local. That is, any call to <code>CallContext.GetData</code> will get the data that was set via SetData from the same thread. Data stored via <code>CallContext.LogicalSetData</code> is considered to be "logical thread" local. That is, any data that is stored via <code>CallContext.LogicalSetData</code> will be "flowed" to any child threads. If you call <code>CallContext.LogicalGetData</code> in the same thread or any child threads, you will get the data that was stored by that thread's (or the parent thread's) call to <code>CallContext.LogicalSetData</code>.</p> <p>As @sixlettervariables points out, there are also some specific differences related to Remoting and cross AppDomain calls (maybe cross AppDomain implies Remoting, I don't know, I am not that familiar with Remoting in general).</p> <p>Also as pointed out by @sixlettervariables, by implementing the marker interface ILogicalThreadAffinative on an object and then storing that object using <code>CallContext.SetData</code>, the object will essentially behave as if it had been stored by <code>CallContext.LogicalSetData</code>.</p> <p>Here is a good blog posting from Jeff Richter about using LogicalSetData/LogicalGetData:</p> <p><a href="http://www.wintellect.com/CS/blogs/jeffreyr/archive/2010/09/27/logical-call-context-flowing-data-across-threads-appdomains-and-processes.aspx" rel="noreferrer">http://www.wintellect.com/CS/blogs/jeffreyr/archive/2010/09/27/logical-call-context-flowing-data-across-threads-appdomains-and-processes.aspx</a></p> <p>Here are some more links from here on SO that might shed some more light on CallContext.SetData/GetData, CallContext.LogicalSetData/LogicalGetData, and various forms of thread local storage:</p> <p><a href="https://stackoverflow.com/questions/273301/callcontext-vs-threadstatic">CallContext vs ThreadStatic</a></p> <p><a href="https://stackoverflow.com/questions/3969476/how-to-pass-a-variable-to-another-thread">How to Pass a variable to another Thread</a></p>
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