985360: Updated ReadMe file

README.md

@@ -1,4 +1,41 @@
-# How-to-filter-the-dropdown-items-in-Winforms-SfComboBox
-This respository contains the sample that how to filter the dropdown items by setting the Filter property of DropDownListView in WF SfComboBox control.
+# How to Filter the Dropdown Items in WinForms SfComboBox
+This repository demonstrates how to filter items in the Syncfusion WinForms SfComboBox control using the built-in filtering feature. The SfComboBox is a modern replacement for the standard ComboBox, offering advanced features such as data binding, auto-complete, and customizable filtering logic. Filtering allows you to display only relevant items based on user-defined conditions, improving usability and performance in applications with large datasets.
 
-UG link: https://help.syncfusion.com/windowsforms/combobox/filtering
+## Key Features Demonstrated in This Sample
+    • Apply custom filtering logic using the Filter property of DropDownListView.
+    • Refresh the filter dynamically at runtime.
+    • Use predicates to determine which items should be visible in the dropdown.
+
+## How Filtering Works
+The Filter property accepts a predicate that is evaluated for each item in the data source. If the predicate returns true, the item remains visible; otherwise, it is hidden. This approach provides flexibility to implement complex filtering scenarios such as prefix matching, substring search, or conditional visibility based on multiple fields.
+
+## Example Code (C#)
+```csharp
+public Form1()
+{
+ InitializeComponent();
+
+ List<USState> list = GetData();
+ this.sfComboBox1.DataSource = list;
+ this.sfComboBox1.DisplayMember = "LongName";
+ this.sfComboBox1.ThemeName = "Office2016Colorful";
+ this.sfComboBox1.DropDownListView.Style.ItemStyle.Font = new Font("Microsoft Sans Serif", 9.75f);
+
+ // Apply filter
+ sfComboBox1.DropDownListView.View.Filter = FilterItem;
+ sfComboBox1.DropDownListView.View.RefreshFilter();
+}
+
+// Filter predicate
+private bool FilterItem(object data)
+{
+ if ((data as USState).LongName.StartsWith("C"))
+ return true;
+ return false;
+}
+```
+
+This sample filters the dropdown items so that only states starting with the letter C are displayed. You can modify the predicate to implement custom logic such as filtering by length, region, or any other property.
+
+For more details, refer to the official UG documentation:
+🔗 [Filtering in Windows Forms SfComboBox](https://help.syncfusion.com/windowsforms/combobox/filtering)