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Provide custom data source and enabling filtering to DropDownList

You can provide data source to the DropDownList by using the params of edit property of e-grid-column.

While setting new data source using edit params, you must specify a new query property too for the DropDownList as follows,

@{
    var DropDownList = new Syncfusion.EJ2.DropDowns.DropDownList() { DataSource = ViewBag.DropDownData, Query = "new ej.data.Query()", AllowFiltering = true, Fields = new Syncfusion.EJ2.DropDowns.DropDownListFieldSettings() { Value = "Country", Text = "Country" }, ActionComplete = "actionComplete" };
}
{
    <e-grid-column field="ShipCountry" headerText="Ship Country" width="150" editType="dropdownedit" edit="new {@params = DropDownList }"></e-grid-column>
}

You can also enable filtering for the DropDownList by passing the allowFiltering as true to the edit params.

In the below demo, DropDownList is rendered with custom Datasource for the ShipCountry column and enabled filtering to search DropDownList items.

tagHelper
edit-dropdownlist.cs
@{
    var DropDownList = new Syncfusion.EJ2.DropDowns.DropDownList() { DataSource = ViewBag.DropDownData, Query = "new ej.data.Query()", AllowFiltering = true, Fields = new Syncfusion.EJ2.DropDowns.DropDownListFieldSettings() { Value = "Country", Text = "Country" }, ActionComplete = "actionComplete" };
}

<ejs-grid id="Grid" dataSource="@ViewBag.DataSource" toolbar="@(new List<string>() { "Add", "Edit", "Delete", "Cancel", "Update" })">
    <e-grid-editSettings allowAdding="true" allowDeleting="true" allowEditing="true" mode="Normal"></e-grid-editSettings>
    <e-grid-columns>
        <e-grid-column field="OrderID" headerText="Order ID" isPrimaryKey="true" textAlign="Right" width="100"></e-grid-column>
        <e-grid-column field="CustomerID" headerText="Customer ID" type="string" width="120"></e-grid-column>
        <e-grid-column field="Freight" headerText="Freight" textAlign="Right" format="C2" editType="numericedit" width="120"></e-grid-column>
        <e-grid-column field="ShipCountry" headerText="Ship Country" width="150" editType="dropdownedit" edit="new {@params = DropDownList }"></e-grid-column>
    </e-grid-columns>
</ejs-grid>
public IActionResult Index()
{
    ViewBag.DataSource = OrderDetails.GetAllRecords();
    ViewBag.DropDownData = DropDownDetails.GetAllRecords();
    return View();
}