Getting selected value of a combobox

Question

public class ComboboxItem                public string Text   get  set                 public string Value   get  set                public override string ToString     return Text                private void comboBox1 SelectedIndexChanged object sender  EventArgs e                        int selectedIndex   comboBox1 SelectedIndex              int selecteVal    int comboBox1 SelectedValue               ComboboxItem selectedCar    ComboboxItem comboBox1 SelectedItem              MessageBox Show String Format  Index    0   CarName  1   Value  2    selectedIndex  selectedCar Text  selecteVal                I m adding them like   ComboboxItem item   new ComboboxItem                        item Text   cd Name                      item Value   cd ID                      this comboBox1 Items Add item     I keep getting a NullReferenceExeption and not sure why  the text seems to show up just fine

User · Answer

Try this   private void cmbLineColor SelectedIndexChanged object sender  EventArgs e                DataRowView drv    DataRowView cmbLineColor SelectedItem          int selectedValue    int drv Row ItemArray 1

User · Answer

Try this   private void comboBox1 SelectedIndexChanged object sender  EventArgs e        ComboBox cmb    ComboBox sender      int selectedIndex   cmb SelectedIndex      int selectedValue    int cmb SelectedValue       ComboboxItem selectedCar    ComboboxItem cmb SelectedItem      MessageBox Show String Format  Index    0   CarName  1   Value  2    selectedIndex  selectedCar Text  selecteVal

User · Answer

Try this   int selectedIndex   comboBox1 SelectedIndex  comboBox1 SelectedItem ToString    int selectedValue    int comboBox1 Items selectedIndex

User · Answer

You are getting NullReferenceExeption because of you are using the cmb SelectedValue which is null  the comboBox doesn t know what is the value of your custom class ComboboxItem  so either do   ComboboxItem selectedCar    ComboboxItem comboBox2 SelectedItem  int selecteVal   Convert ToInt32 selectedCar Value     Or better of is use data binding like   ComboboxItem item1   new ComboboxItem    item1 Text    test   item1 Value    123    ComboboxItem item2   new ComboboxItem    item2 Text    test2   item2 Value    456    List lt ComboboxItem gt  items   new List lt ComboboxItem gt    item1  item2     this comboBox1 DisplayMember    Text   this comboBox1 ValueMember    Value   this comboBox1 DataSource   items

User · Answer

I had a similar error  My Class is  public class ServerInfo       public string Text   get  set        public string Value   get  set        public string PortNo   get  set         public override string ToString                 return Text            But what I did  I casted my class to the SelectedItem property of the ComboBox  So  i ll have all of the class properties of the selected item      Code above ServerInfo emailServer    ServerInfo cbServerName SelectedItem   mailClient ServerName   emailServer Value  mailClient ServerPort   emailServer PortNo    I hope this helps someone  Cheers

User · Answer

You have to cast the selected item to your custom class  ComboboxItem  Try this   private void comboBox1 SelectedIndexChanged object sender  EventArgs e    ComboBox cmb    ComboBox sender              int selectedIndex   cmb SelectedIndex              string selectedText   this comboBox1 Text              string selectedValue     ComboboxItem cmb SelectedItem  Value ToString     ComboboxItem selectedCar    ComboboxItem cmb SelectedItem  MessageBox Show String Format  Index    0   CarName  1   Value  2    selectedIndex  selectedCar Text  selecteVal

User · Answer

The problem you have with the SelectedValue is not converting into integer  This is the main problem so usinge the following code snippet will help you   int selectedValue  bool parseOK   Int32 TryParse cmb SelectedValue ToString    out selectedValue

[c#] Getting selected value of a combobox

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