How to get the definition query of a layer in ArcMap from an AddIn tool's code?

[Gurunara]

A little new to ArcObject's SDK... Is this the place to create the post?
Need to access the definition query of a layer that the user created in the ArcMap application (if the layer exists) from an addin tool's code. Need to access this definition query and apply it to a search/query.

Is there a sample code/example for this?

[BrentHoskisson]

You have to query inteface to IFeatureLayerDefinition2:

IFeatureLayerDefinition2 ifld = (IFeatureLayerDefinition2)layer;
string defquery = ifld.DefinitionExpression;

Brent Hoskisson