error: no valid index range

MariaMaldini

I am trying to add a new field and fill the field for some of rows but I face with the following error:

"The index passed was not within the valid range."

  My simplified codes:    

          

                IMxDocument mxdoc = ArcMap.Application.Document as IMxDocument;

                IMap map = mxdoc.FocusMap;

                ILayer layer = map.Layer[0];

                IFeatureLayer2 featureLayer = layer as IFeatureLayer2;

                IFeatureClass flFeatureClass = featureLayer.FeatureClass;

                IFeatureCursor featureCursor = flFeatureClass.Search(null, true);

                IFeature feature2 = featureCursor.NextFeature();

                IFieldEdit2 newField = new FieldClass();

                newField.Name_2 = "name";

                newField.Editable_2 = true;

                newField.Type_2 = esriFieldType.esriFieldTypeString;

                flFeatureClass.AddField(newField);

                while (feature2 != null)

                {

                    feature2.set_Value(flFeatureClass.FindField("name"), "rome");

                    feature2.Store();

                    feature2 = featureCursor.NextFeature();

                }

         

    When i used "breakpoint" to find the error line.  i found out that

  feature2.set_Value(flFeatureClass.FindField("name"), "rome");

  is the line that causes the error (The index passed was not within the valid range).

  I do not know what is wrong with set_value method. when i try to update a already created field, it work right but

  when i want to create a new field and fill it with some data as mentioned codes , i encounter with the error.

Thanks in advance

XanderBakker

... and if you read my answer carefully, you would have noticed that I referred to adding the field before creating the cursor...