Drop element Line String

I use microstation, DGN 2D V7 Upgrade V8

I use C# language

I want to break the LineString association into separate LineStrings as shown below

ElementScanCriteria _MSesc = new ElementScanCriteriaClass();

ElementEnumerator oEnumeration = app.ActiveModelReference.Scan(_MSesc);

while (oEnumeration.MoveNext())


I tried but it gives error "Specified cast is not valid"

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