c# - Xamarin android unable to assign text value to edit text -

i new mobile development. working on android in xamarin using visual studio 2015. following sample code , doing same described in it.

i getting exception when try assign text value edit text in update layout. bellow code in assigning values edit text

void list_itemclick(object sender, adapterview.itemclickeventargs e)     {         click_employee = e.position + 1;         icursor c = dbhelper.getsingleentry(click_employee);         c.movetofirst();         name = c.getstring(c.getcolumnindex(dbhelper.employee_name));         email = c.getstring(c.getcolumnindex(dbhelper.employee_email));         phone = c.getstring(c.getcolumnindex(dbhelper.employee_phone));         designation = c.getstring(c.getcolumnindex(dbhelper.employee_designation));         dname.text = name;         demail.text = email;         dphone.text = phone;         ddesignation.text = designation;     } 

in above code exception raised @ dname.text = name; bellow error description

system.nullreferenceexception: object reference not set instance of object. 

same work performed in show complete data function there things good, don't know what's happening in update function

update 1

bellow insert employee code

namespace appwithdb.resources { [activity(label = "insertemployee")] class insertemployee : activity {     edittext name, email, phone, designation;     button submitbtn;     private sqlitehelper dbhelper;      protected override void oncreate(bundle bundle)     {         base.oncreate(bundle);          //create app here           setcontentview(resource.layout.insert);         initialize();         dbhelper = new sqlitehelper(this);         submitbtn.click += submitbtn_click;     }       private void submitbtn_click(object sender, eventargs e)     {         if (name.text.tostring().equals("") || email.text.tostring().equals("")|| phone.text.tostring().equals("") || designation.text.tostring().equals(""))         {             toast.maketext(this, "fields empty found", toastlength.short).show();         }         else         {             dbhelper.insertemployee(name.text.tostring(), email.text.tostring(), phone.text.tostring(), designation.text.tostring());             toast.maketext(this, "data stored successfully", toastlength.short).show();             name.text = " ";             email.text = " ";             phone.text = " ";             designation.text = " ";         }     }      private void initialize()     {         name = (edittext)findviewbyid(resource.id.empname);         email = (edittext)findviewbyid(resource.id.empemail);         phone = (edittext)findviewbyid(resource.id.empphone);         designation = (edittext)findviewbyid(resource.id.empdesignation);         submitbtn = (button)findviewbyid(resource.id.insertempbtn);     } }} 

update 2

bellow code update employee

namespace appwithdb.resources { [activity(label = "updateemployee")] class updateemployee:activity {     listview list;      edittext dname, demail, dphone, ddesignation;     string name, email, phone, designation;     sqlitehelper dbhelper;     int click_employee;     button upbtn;      protected override void oncreate(bundle bundle)     {         base.oncreate(bundle);          // create application here         setcontentview(resource.layout.update);         initialize();         dbhelper = new sqlitehelper(this);         system.collections.arraylist datalist = dbhelper.getallemployeesdata();         string[] myarr = (string[])datalist.toarray(typeof(string));         list.adapter = new arrayadapter(this, android.resource.layout.simpleexpandablelistitem1, myarr);          list.itemclick += list_itemclick;          upbtn.click += delegate         {             dbhelper.updateemployeeinfo(click_employee, dname.text.tostring(), demail.text.tostring(), dphone.text.tostring(), ddesignation.text.tostring());         };      }      private void initialize()     {         list = (listview)findviewbyid(resource.id.listview1);         dname = (edittext)findviewbyid(resource.id.ename);         demail = (edittext)findviewbyid(resource.id.eemail);         dphone = (edittext)findviewbyid(resource.id.ephone);         ddesignation = (edittext)findviewbyid(resource.id.edesignation);         upbtn = (button)findviewbyid(resource.id.updateemploy);     }     void list_itemclick(object sender, adapterview.itemclickeventargs e)     {         click_employee = e.position + 1;         icursor c = dbhelper.getsingleentry(click_employee);         c.movetofirst();         name = c.getstring(c.getcolumnindex(dbhelper.employee_name));         email = c.getstring(c.getcolumnindex(dbhelper.employee_email));         phone = c.getstring(c.getcolumnindex(dbhelper.employee_phone));         designation = c.getstring(c.getcolumnindex(dbhelper.employee_designation));         dname.text = name;         demail.text = email;         dphone.text = phone;         ddesignation.text = designation;     }   }} 

update 3 :

bellow xmls of complete_data , update

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:padding="10dp"> <scrollview     android:layout_width="fill_parent"     android:layout_height="fill_parent">     <linearlayout         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:orientation="vertical">         <listview             android:id="@+id/listview1"             android:layout_width="match_parent"             android:layout_height="350dp"             android:divider="#000"             android:dividerheight="1dp" />         <textview             android:id="@+id/ename"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="name" />         <textview             android:id="@+id/eemail"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="email" />         <textview             android:id="@+id/ephone"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="phone" />         <textview             android:id="@+id/edesignation"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="designation" />     </linearlayout></scrollview></linearlayout> 

update xml

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:padding="10dp"> <scrollview     android:layout_width="fill_parent"     android:layout_height="fill_parent">     <linearlayout         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:orientation="vertical">         <listview             android:id="@+id/listview1"             android:layout_width="match_parent"             android:layout_height="250dp"             android:divider="#000"             android:dividerheight="1dp" />         <edittext             android:id="@+id/upname"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:hint="name" />         <edittext             android:id="@+id/upemail"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:hint="email" />         <edittext             android:id="@+id/upphone"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:hint="phone" />         <edittext             android:id="@+id/updesignation"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:hint="designation" />         <button             android:id="@+id/updateemploy"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:text="update employee" />     </linearlayout></scrollview></linearlayout>  

for better understanding sample code given above.

any highly appreciated

the problem use wrong view ids. in xml there upname, , searching resource.id.ename.
fix problem need change resource.id.ename resource.id.upname