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PKPrakash Kumar D Syncfusion Team July 20, 2018 09:24 AM UTC
Hi Suranga,
Thank you for contacting Syncfusion support.
In XlsIO, we only have support for adding and creating the custom Add-In functions. However, you can useCalcEngine.ParseAndComputeFormula(string formula) method to get calculated value of a formula using custom function. We have shared a sample for your reference which can be downloaded from the following link.