I am currently using a Telerik RadFilter control to allow ad-hoc searching of my RadGrid. The problem is that it is case sensitive by default and I could not find any way to change that in the control's settings. After wasting a considerable amount of time, I found the answer in the RadGrid options. Under Group Settings->Case Sensitive property on the RadGrid. Just set this property to false (as seen in the screenshot below) and you should be good to go.