Use generic FilterDescriptor
This help article will show you how to create generic expression FilterDescriptors
Generic FilterDescriptor
The new FilterDescriptor
Example 3: Create a generic FilterDescriptor
var descriptor = new FilterDescriptor<Employee> { FilteringExpression = e => prospects.Contains(e) };
Then, you should add the defined FilterDescriptor to the FilterDescriptors collection of RadGridView.
For more information you can check the Filtering section