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WinForms ComboBox data binding gotcha

By : tdowg1
Date : March 29 2020, 07:55 AM
help you fix your problem This has to do with how data bindings are set up in the dotnet framework, especially the BindingContext. On a high level it means that if you haven't specified otherwise each form and all the controls of the form share the same BindingContext. When you are setting the DataSource property the ComboBox will use the BindingContext to get a ConcurrenyMangager that wraps the list. The ConcurrenyManager keeps track of such things as the current selected position in the list.
When you set the DataSource of the second ComboBox it will use the same BindingContext (the forms) which will yield a reference to the same ConcurrencyManager as above used to set up the data bindings.
code :

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Linq sql data binding to winforms combobox

By : user92363
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Ok...Issue was traced to funky winform behavior. Evidently, there is no guarantee that the OnLoad for a user control will not be called more than once. As a consequence, the two tables involved, (see diagram above), were being loaded from different DataContexts. Splat!!

Data binding an Enum stored in an object into a Winforms ComboBox?

By : user1662712
Date : March 29 2020, 07:55 AM
I hope this helps you . You can use a two-way binding on the SelectedItem property of the ComboBox. When adding values to the combo box, be sure to add the enum values and not just strings that match their display name.
code :
// ... etc
public partial class Form1 : Form {

    private Person p = new Person( );

    public Form1( ) {

        InitializeComponent( );

        comboBox1.DataSource = Enum.GetValues( typeof( Gender ) );

        textBox1.DataBindings.Add( "Text", p, "Name", false, DataSourceUpdateMode.OnPropertyChanged );
        comboBox1.DataBindings.Add( "SelectedItem", p, "Gender", false, DataSourceUpdateMode.OnPropertyChanged );

        label1.DataBindings.Add( "Text", p, "Name", false, DataSourceUpdateMode.Never );
        label2.DataBindings.Add( "Text", p, "Gender", false, DataSourceUpdateMode.Never );

    private void Form1_Load( object sender, EventArgs e ) {
        // yeah, that's right i voted for him,
        // go ahead and downvote me
        p.Name = "John McCain";
        p.Gender = Gender.Male;
    private void Form1_Click( object sender, EventArgs e ) {
        p.Name = "Sarah Palin";
        p.Gender = Gender.Female;

public enum Gender {

public class Person : INotifyPropertyChanged {

    private string name;
    private Gender gender;

    public string Name
        get { return name; }
        set {
            name = value;
            PropertyChanged( this, new PropertyChangedEventArgs( "Name" ) );

    public Gender Gender {
        get { return gender; }
        set {
            gender = value;
            PropertyChanged( this, new PropertyChangedEventArgs( "Gender" ) );

    public event PropertyChangedEventHandler PropertyChanged = delegate {};


Binding Label and Value to ComboBox Winforms

By : Angelo Ruggiero
Date : March 29 2020, 07:55 AM
this will help You can bind a dictionary to a datasource by using the ToList() method of the dictionary.
code :
LvName.DataSource = itemValue.ToList()
LvName.DisplayMember = "Value"
LvName.ValueMember = "Key"

Linq-to-sql to Combobox binding (Winforms)

By : seco yah
Date : March 29 2020, 07:55 AM
should help you out The selected item of a combobox is the current object in its data source, in this case: a User. You must use SelectedValue:
code :
comboBoxAssessor.DataBindings.Add("SelectedValue", _comment, "UserId");

Winforms ComboBox User Control Binding

By : Williams Douglas
Date : March 29 2020, 07:55 AM
I wish this helpful for you http://social.msdn.microsoft.com/forums/vstudio/en-US/3e35b534-7d3f-4832-8859-b5cb838bd62a/extended-combobox-adds-items-twice
code :
public partial class CheckSeriesBox : ComboBox
    private static List<string> CheckSeries;

    public CheckSeriesBox()

        CheckSeries = new List<string>();

        if (DesignMode)

    public static List<string> SetCheckSeries()

    protected new bool DesignMode
            if (base.DesignMode)
                return true;
                Control parent = this.Parent;
                while ((parent != null))
                    System.ComponentModel.ISite site = parent.Site;
                    if ((site != null) && site.DesignMode)
                        return true;
                    parent = parent.Parent;
                return false;

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