Query and modification of features in ArcGIS

Turn from Nimeila's answer ask C # ArcGIS engine to modify the properties of a selected feature, a single feature line

Rlalterfrm Rlalter =Newrlalterfrm (); Rlalter.showdialog ();stringAlterid =RLalter.textBox1.Text;stringALTERRP =RLalter.textBox2.Text;stringALTERC =rlalter.textbox3.text;axmapcontrol1.clearlayers (); Axmapcontrol1.refresh ();Try{    stringstrFileName = Application.startuppath +@"\ Data \roadlamp.mxd"; //load a map in a data view for query operations    if(Axmapcontrol1.checkmxfile (strFileName)) {axmapcontrol1.loadmxfile (strFileName); }    Else{MessageBox.Show ("wrong data path:"+strFileName); }}Catch(Exception ex) {MessageBox.Show ("Error01 in MainForm.cs"+Ex. Message);} Axmapcontrol1.refresh ();stringStrqk = Rlalter.getquerykey ();//Get Query Value//Find LayerIfeaturelayer Pfeaturelayer =NewFeaturelayer ();p Featurelayer= Axmapcontrol1.get_layer (0) asIfeaturelayer;//Find FeaturesIqueryfilter Pqueryfilter =Newqueryfilter ();p queryfilter.whereclause="[rl_id] = '"+ Strqk +"'"; Ifeaturecursor pfeaturecur= Pfeaturelayer. Search (Pqueryfilter,false); IFeature pfeature=NULL;p Feature=pfeaturecur.nextfeature ();if(NULL==pfeature) {MessageBox.Show ("I'm sorry! The element does not exist");}Else{ifields Pfields=Pfeature.fields;ifeatureclass Pfeatureclass=Pfeaturelayer.    Featureclass; //Modifying property values    intField1 = Pfields.findfield ("rl_id"); intField2 = Pfields.findfield ("RL_RP"); intfield3 = Pfields.findfield ("Rl_c");    Pfeature.set_value (field1, Alterid);    Pfeature.set_value (Field2, ALTERRP);    Pfeature.set_value (field3, ALTERC);    Pfeature.store (); MessageBox.Show ("modified successfully! ","Tips");}}

Query and modification of features in ArcGIS