private void addFeatureFeild(string fieldName, string aliasName, esriFieldType type, IFieldsEdit fieldsEdit) { IField field = new FieldClass(); IFieldEdit fieldEdit = (IFieldEdit)field; fieldEdit.Name_2 = fieldName; fieldEdit.Type_2 = type; fieldEdit.AliasName_2 = aliasName; fieldsEdit.AddField(field); }