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private void ExportToShapefile(IFeatureClass fc, IWorkspace outWorkspace)
{

IDataset inDataSet = fc as IDataset;
IFeatureClassName inFCName = inDataSet.FullName as IFeatureClassName;
IWorkspace inWorkspace = inDataSet.Workspace;

IDataset outDataSet = outWorkspace as IDataset;
IWorkspaceName outWorkspaceName = outDataSet.FullName as IWorkspaceName;

IFeatureClassName outFCName = new FeatureClassNameClass();
IDatasetName dataSetName = outFCName as IDatasetName;
dataSetName.WorkspaceName = outWorkspaceName;
dataSetName.Name = fc.AliasName.ToString();


IFieldChecker fieldChecker = new FieldCheckerClass();
fieldChecker.InputWorkspace = inWorkspace;
fieldChecker.ValidateWorkspace = outWorkspace;

IFields fields = fc.Fields;
IFields outFields = null;
IEnumFieldError enumFieldError = null;
fieldChecker.Validate(fields,out enumFieldError,out outFields);

IFeatureDataConverter featureDataConverter = new FeatureDataConverterClass();
featureDataConverter.ConvertFeatureClass(inFCName,null,null,outFCName,null,outFields,"",100,0);

}