Hi SAM,
Thanks for your patience.
We have the Custom Value option in ComboBox and Multiselect
Dropdown Component. In DropDownList we don’t have the Custom Value option. We
suggest you try ComboBox instead of Dropdown Component. Because both components
have similar functionalities. Also, We shared the sample and documentation link
of the ComboBox component. Please let us know if you face any complexity in the
use of the ComboBox Component.
Sample Link: https://blazor.syncfusion.com/demos/combobox/custom-value?theme=fluent
Documentation (CustomValue for ComboBox) : https://blazor.syncfusion.com/documentation/combobox/custom-value
To use this in the Grid column while editing, we suggest you to
render the ComboBox in the EditTemplate feature to achieve this above
requirement.
https://blazor.syncfusion.com/documentation/datagrid/cell-edit-types#using-combobox-in-edittemplate
Please let us know if you have any concerns.
Regards,
Rahul