Hi Tobias,
Thanks for your interest in Syncfusion Products.
You can use Expression property of GridConditionalFormatDescriptor class to specify the ConditionalFormats.
Please try code like this:
GridConditionalFormatDescriptor Descriptor1 = new GridConditionalFormatDescriptor();
Descriptor1.Appearance.AnyRecordFieldCell.Enabled = false;
Descriptor1.Appearance.AnyRecordFieldCell.BackColor = Color.Orange;
Descriptor1.Expression = "(([Col1] Like "CRiDRS") or ([Col1] Like "CRANE"))And (([Col2] Like "Market Data") or ([Col2] Like "Credit Data"))";
this.gridGroupingControl1.TableDescriptor.ConditionalFormats.Add(Descriptor1);
Here is a small sample:
http://websamples.syncfusion.com//samples/Grid.Windows/Development/GGC_ConditionalFormating_String.zipPlease let me know if this helps.
Regards,
Nisha