wpf combobox items help...

[gihan_u]

machan mata wpf wala combobox ekata items add karanawa data source ekakin.data add wenne for loop ekakin.mata ona aluthen data add karanna kalin combobox eke data clear karanna.mama combobox.Items.Clear() method eka use kala.eth wada karanne nahane machan

 

[gihan_u]

BUMP

thanks machan...danna kawuruhari help ekak denna machan...dan godak dawas meka try karanawa hadaganna

 

[mithunmaxxx]

try this Combobox.ItemsSource = null

machn oya ItemsSource eka set krnwa nam aniwa meka hari ynna ona

oya nikan items.add() use krnwa nam items.clear() weda krnna ona

 

[gihan_u]

try this Combobox.ItemsSource = null

machn oya ItemsSource eka set krnwa nam aniwa meka hari ynna ona

oya nikan items.add() use krnwa nam items.clear() weda krnna ona

okath try kala machan eth wada naha mama mulinma for loop ekakin items add kala.ekata use kala items.add() method eka.eeta passe ekedi items.clear() method eka use kala.eka hari giye nathi nisa data source ekak hadala eka combobox ekata bind kala.public class ekak hadala eke get ekai set ekai daala,e public class eken data list ekak hadala e data list eka combobox eke data source eka widiyata bind kala.ekedi use kala Combobox.ItemsSource = null eka.eth wada naha machan

 

[mithunmaxxx]

okath try kala machan eth wada naha mama mulinma for loop ekakin items add kala.ekata use kala items.add() method eka.eeta passe ekedi items.clear() method eka use kala.eka hari giye nathi nisa data source ekak hadala eka combobox ekata bind kala.public class ekak hadala eke get ekai set ekai daala,e public class eken data list ekak hadala e data list eka combobox eke data source eka widiyata bind kala.ekedi use kala Combobox.ItemsSource = null eka.eth wada naha machan

oya data binding desgin time ekae di code behind ekadi 2kema krnwda?

 

[gihan_u]

oya data binding desgin time ekae di code behind ekadi 2kema krnwda?

code eke machan karanne mama,

combobox.ItemsSource hari combobox.DataContext equal karanawa data source ekata.

Design view eke mama,

ItemsSource="{Binding Path="datasorce attribute"}" eka denawa

 

[mithunmaxxx]

code eke machan karanne mama,

combobox.ItemsSource hari combobox.DataContext equal karanawa data source ekata.

Design view eke mama,

ItemsSource="{Binding Path="datasorce attribute"}" eka denawa

machn Design time ekaei code ekai 2kema krnna epa. oya desgin time ekae glwala blnna wedae hari yai

 

[gihan_u]

machn Design time ekaei code ekai 2kema krnna epa. oya desgin time ekae glwala blnna wedae hari yai

machan ehemath kala machan.eth naha mata kalin kiyanna amathaka wuna machan.mama try catch ekak daala exception eka baluwa.program eka run weddima monawathma karanna kalin "Object reference not set to an instance of an object kiyala" exception ekak enawa machan

 

[mithunmaxxx]

machan ehemath kala machan.eth naha mata kalin kiyanna amathaka wuna machan.mama try catch ekak daala exception eka baluwa.program eka run weddima monawathma karanna kalin "Object reference not set to an instance of an object kiyala" exception ekak enawa machan

machn puluwannam exception mesaage eka ewanna netnam code eka shre kalot nam help ekak denna pulwan wai

 

[gihan_u]

machn puluwannam exception mesaage eka ewanna netnam code eka shre kalot nam help ekak denna pulwan wai

exception eke echcharai machan pennanne.meka thamai machan code eka.mama me combobox ekata items load karanne anik combobox eke selection changed event eken.

private void comboBox6_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            try
            {
                    string subject = comboBox6.Text;
                   datasetTableAdapters.dataTableAdapter sdta = new  datasetTableAdapters.dataTableAdapter();
                    dataset tds = new dataset();

                    sdta.FillByTeacherid(tds.data, subject);

                    int size = tds.data.Rows.Count;
                    int[] arrsize = new int[size];

                    for (int i = 0; i < size; i++)
                    {
                        string tid = Convert.ToString(tds.data.Rows[i]["id"].ToString());
                        int teaid = int.Parse(tid);
                        arrsize[i] = teachid;
                    }

                    
                    List<teame> tnamest = new List<teame>();
                    for (int i = 0; i < size; i++)
                    {
                        datasetTableAdapters.dataTableAdapter tdta = new datasetTableAdapters.dataTableAdapter();

                        int tid = arrsize[i];
                        string firstName = tdta.getFname(tid);

                        tnamest.Add(new teame { fname = firstName });
                    }


                    comboBox12.ItemsSource = tnamest;
                
            }
            catch (Exception e5)
            {
                MessageBox.Show("" + e5);
            }
        }

        public class teame
        {
            public string fname { get; set; }
        }

meke comboBox6_SelectionChanged event ekedi comboBox ekata data load wenawa

 

[mithunmaxxx]

exception eke echcharai machan pennanne.meka thamai machan code eka.mama me combobox ekata items load karanne anik combobox eke selection changed event eken.

private void comboBox6_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            try
            {
                    string subject = comboBox6.Text;
                   datasetTableAdapters.dataTableAdapter sdta = new  datasetTableAdapters.dataTableAdapter();
                    dataset tds = new dataset();

                    sdta.FillByTeacherid(tds.data, subject);

                    int size = tds.data.Rows.Count;
                    int[] arrsize = new int[size];

                    for (int i = 0; i < size; i++)
                    {
                        string tid = Convert.ToString(tds.data.Rows[i]["id"].ToString());
                        int teaid = int.Parse(tid);
                        arrsize[i] = teachid;
                    }

                    
                    List<teame> tnamest = new List<teame>();
                    for (int i = 0; i < size; i++)
                    {
                        datasetTableAdapters.dataTableAdapter tdta = new datasetTableAdapters.dataTableAdapter();

                        int tid = arrsize[i];
                        string firstName = tdta.getFname(tid);

                        tnamest.Add(new teame { fname = firstName });
                    }


                    comboBox12.ItemsSource = tnamest;
                
            }
            catch (Exception e5)
            {
                MessageBox.Show("" + e5);
            }
        }

        public class teame
        {
            public string fname { get; set; }
        }

meke comboBox6_SelectionChanged event ekedi comboBox ekata data load wenawa

machn cheak krla blnna mae line ekae int size = tds.data.Rows.Count;
tds.data eka null wenwda kiyla

 

[gihan_u]

machn cheak krla blnna mae line ekae int size = tds.data.Rows.Count;
tds.data eka null wenwda kiyla

naha machan.null wenne naha.datasource eka dammama data pennanne characters widiyata.e kiyanne machan hithannako name ekak thiyenawa "sumith" kiyala.ethakota combobox eke pennanne,
s
u
m
i
t
h kiyala
items.Add() ekedi hariyata pennanawa.mokak kalath machan data clear karanna baha

uba pennapu thana null wenne naha machan.ane manda mata hithaganna baha ban

 

[mithunmaxxx]

naha machan.null wenne naha.datasource eka dammama data pennanne characters widiyata.e kiyanne machan hithannako name ekak thiyenawa "sumith" kiyala.ethakota combobox eke pennanne,
s
u
m
i
t
h kiyala
items.Add() ekedi hariyata pennanawa.mokak kalath machan data clear karanna baha

aetakota exception eka ennae mon line ekenda? oya debug krla baluwda?

machn oygae email eka ewanna mama sample project ekak krla ewannam

 

[gihan_u]

aetakota exception eka ennae mon line ekenda? oya debug krla baluwda?

machn oygae email eka ewanna mama sample project ekak krla ewannam

machan mama ubata email eka pm kala.sorry machan issella maara widiyata akunu gahuwa.dan thamai machine eka on kale.thanks bro help ekata

 

[MihiCherub]

mama wpf danne na..eth normally combobox model ekak one wenawa.. ehema nathuwa data add karaddi thama oya probs enne. model ekak hadala ekata add karala balanna,,,

 

[gihan_u]

mama wpf danne na..eth normally combobox model ekak one wenawa.. ehema nathuwa data add karaddi thama oya probs enne. model ekak hadala ekata add karala balanna,,,

machan mama wena combobox ekakata items add karanawa model ekak nathuwa.eke kisi awulak naha

 

[MihiCherub]

machan mama wena combobox ekakata items add karanawa model ekak nathuwa.eke kisi awulak naha

mata me theory hoyaganna ba.. normally model ekak haraha thama wada karanna one... model eka nathuwa data add karanakotai remove karakotai problems enawa. model ekak hadala karapan..

 

[gihan_u]

mata me theory hoyaganna ba.. normally model ekak haraha thama wada karanna one... model eka nathuwa data add karanakotai remove karakotai problems enawa. model ekak hadala karapan..

eth machan anith ewa kisi awulak nathuwa wadane.

meke podi thawa seen ekak thiyenawa.combobox eke selection changed event ekedi mama combobox value eka gaththama enne change wenna kalin thibba value ekane.mokda ban e?

 

[MihiCherub]

eth machan anith ewa kisi awulak nathuwa wadane.

meke podi thawa seen ekak thiyenawa.combobox eke selection changed event ekedi mama combobox value eka gaththama enne change wenna kalin thibba value ekane.mokda ban e?

uba pandithayane.. model ekak hadanna puluwan nam hada gena karapan.. ethakota prshna na.

 

[mithunmaxxx]

machan mama wena combobox ekakata items add karanawa model ekak nathuwa.eke kisi awulak naha

machn wedae tama hari nedda?