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Calculate 2D line of site from line layer and polygon layer using ArcGIS 10

I'm trying to run an analysis where I need to clip a radiating lines layer by land features to get the maximum distance from the central point to the nearest obstacle. What I have is a large line ...
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Using the esri analysisTool Erase class in C#

I am trying to use eSRI.ArcGIS.AnalysisTools.Erase class but I keep getting blank layers. I can get the layer that can be used for the input and the layer for the erase. I don't really understand the ...
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erase a “line feature” (erase feature) from a “polygone feature”

how can I erase a "line feature" (erase feature) from a "polygone feature" (input) in ArcGIS 10? With the tool "erase" I can only use an other "polygon feature" as erase feature for a polygon ...