How to Bind SelectedItem Property in WinForms SfComboBox

This example demonstrates how to bind the SelectedItem property of the Syncfusion WinForms SfComboBox control to another property in your application. Binding the SelectedItem property is useful when you want to synchronize the selected value in the combo box with a property in your data model or view model. This ensures that any changes in the UI are reflected in the underlying data and vice versa.

Why Use Data Binding?

Data binding simplifies the process of keeping the UI and data model in sync. When you bind the SelectedItem property:

• The selected item in the combo box updates automatically when the bound property changes.
• Any user selection in the combo box updates the bound property without additional code.

Implementation Steps

1. Prepare the ViewModel: Create a ViewModel class with a collection of items and a property to hold the selected item.
2. Configure SfComboBox:
   • Set the DataSource to the collection of items.
   • Define DisplayMember and ValueMember for proper display and value mapping.
3. Bind SelectedItem:
   • Use the DataBindings.Add method to bind the SelectedItem property of SfComboBox to the ViewModel property.

Example Code

public Form1()
{
    InitializeComponent();

    ViewModel viewModel = new ViewModel();

    sfComboBox1.DataSource = viewModel.Items;
    sfComboBox1.DisplayMember = "LongName";
    sfComboBox1.ValueMember = "ShortName";

    sfComboBox1.DataBindings.Add(
        new Binding("SelectedItem", viewModel, "Selected", true, DataSourceUpdateMode.OnPropertyChanged)
    );
}

This code binds the SelectedItem property of sfComboBox1 to the Selected property in the ViewModel. The binding uses DataSourceUpdateMode.OnPropertyChanged to ensure updates occur immediately when the property changes.

Reference

For more details, refer to the official Syncfusion Knowledge Base article:
How to Bind SelectedItem Property in SfComboBox